The 2021 Chevrolet Express 3500 has 75 electrical switch & relay parts with verified fitment on this page — 32 part types and 15 brands, covering all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8). Each part includes a manufacturer part number and application notes.
On the 2021 Chevrolet Express 3500, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. Most of the listed parts are Power Window Switch (8 parts), Headlamp Switch (7 parts) and Oil Pressure Sender / Switch (7 parts). The other 29 part types cover the remaining 53 parts.
The 2021 Chevrolet Express 3500 was sold with 3 engines. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
15 brands supply electrical switch & relay parts for the 2021 Chevrolet Express 3500, led by GM GENUINE (27 parts), WELLS (12 parts) and STANDARD MOTOR PRODUCTS (10 parts), plus 12 more brands. Quality grades include Standard Replacement and Economy.
A "Popular" badge means the source catalog flagged the part as frequently chosen for the 2021 Chevrolet Express 3500. 9 parts have it, including GM GENUINE 1550618 (A/C Refrigerant Pressure Switch) and DORMAN 920053 (Headlamp Switch). Each part number opens a page with every vehicle that part fits.
A/C Clutch Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 6.6L V8 | SW10082C | 🇺🇸 US 🇨🇦 CA | Clutch Cycling Switch | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 6.6L V8 | 37308 | 🇺🇸 US 🇨🇦 CA | Pressure Switch | View on Amazon |
| GPD Fits: 6.6L V8 | 1711456 | 🇺🇸 US 🇨🇦 CA | A/C Clutch Cycle SwitchAccumulator Mounted | View on Amazon |
This table covers the A/C Clutch switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 A/C Clutch Switch parts for the 2021 Chevrolet Express 3500 come from 3 brands — UAC, FOUR SEASONS and GPD.
The Economy section lists 1 option from UAC — the catalog's value-priced group. UAC SW10082C is listed in this group.
In the Standard Replacement grade, FOUR SEASONS and GPD supply 2 parts: built to original-equipment specification. A representative part number is FOUR SEASONS 37308.
Part numbers include UAC SW10082C, FOUR SEASONS 37308 and GPD 1711456.
A/C Compressor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS Fits: 6.6L V8 | 36141 | 🇺🇸 US 🇨🇦 CA | with 10S20F CompressorRecommended To Eliminate Compressor Damage On Vehicles with Low Mount Compressor | View on Amazon |
This table covers the relays that control the A/C Compressor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 2021 Chevrolet Express 3500 — FOUR SEASONS 36141.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 6.6L V8 | 1550618 | 🇺🇸 US 🇨🇦 CA | Air ConditioningManual Controls(C60) | View on Amazon |
| FOUR SEASONS Fits: 6.6L V8 | 20915 | 🇺🇸 US 🇨🇦 CA | Pressure Switch | View on Amazon |
| GM GENUINE Fits: 6.6L V8 | 1551388 | 🇺🇸 US 🇨🇦 CA | Fits Mating Connector Use 86792094with Integrated Circuit | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | PCS183 | 🇺🇸 US 🇨🇦 CA | Low PressureCut-Off | View on Amazon |
| UAC Fits: 6.6L V8 | SW11475C | 🇺🇸 US 🇨🇦 CA | High Pressure Switch | View on Amazon |
This table covers the pressure switches on the A/C circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
5 A/C Refrigerant Pressure Switch parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE, FOUR SEASONS, STANDARD MOTOR PRODUCTS and 1 other brand. GM GENUINE 1550618 carries the "Popular" badge.
Listed part numbers: GM GENUINE 1550618, FOUR SEASONS 20915 and GM GENUINE 1551388, plus the other parts above.
Auxiliary Battery Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 12135194 | 🇺🇸 US 🇨🇦 CA | Two 8MM Studs, Also Mates with Conn 13586114770 CCA Dual Battery (TP3) | View on Amazon |
This table covers the relays that control the Auxiliary Battery circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
This group shows a single part: GM GENUINE 12135194.
Blower Motor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 6.6L V8 | 1R3844 | 🇺🇸 US 🇨🇦 CA | Auxiliary | View on Amazon |
This table covers the relays that control the Blower Motor circuit. Typical signs include a click with no action, or a circuit that works only when you swap in a known-good relay. Swap with an identical relay in the fuse box before buying — it is the fastest test there is.
One part is listed for the 2021 Chevrolet Express 3500 — WELLS 1R3844.
Blower Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 86516210 | 🇺🇸 US 🇨🇦 CA | Switch Position Quantity: 4 | View on Amazon |
This table covers the Blower switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 86516210.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 6.6L V8 | V51730196 | 🇺🇸 US 🇨🇦 CA | Stop Light Switch, 3 Pins | View on Amazon |
This table covers the pedal-mounted switch that turns on the brake lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — VEMO V51730196.
Brake Pressure Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 10218778 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
This table covers the Brake Pressure Warning switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 10218778.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | D1957E | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | DS2156 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
This table covers the Cruise Control switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Cruise Control Switch parts for the 2021 Chevrolet Express 3500 come from 2 brands — GM GENUINE and STANDARD MOTOR PRODUCTS.
Listed part numbers: GM GENUINE D1957E and STANDARD MOTOR PRODUCTS DS2156.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: 6.6L V8 | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | CBS1945 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 6.6L V8 | 1S11511 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the dimmer switches that select headlamp high and low beam. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
3 Dimmer Switch parts for the 2021 Chevrolet Express 3500 come from 3 brands — ROSTRA, STANDARD MOTOR PRODUCTS and WELLS.
Part numbers include ROSTRA 640123, STANDARD MOTOR PRODUCTS CBS1945 and WELLS 1S11511.
Door Jamb Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | D6068 | 🇺🇸 US 🇨🇦 CA | 3 doorHinged Side Cargo/Seat Access Door (E24) | View on Amazon |
| GM GENUINE Fits: 6.6L V8 | 15676080 | 🇺🇸 US 🇨🇦 CA | 3 doorSLIDING REAR S/D CONTROL(YA2) | View on Amazon |
This table covers the Door Jamb switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Door Jamb Switch parts for the 2021 Chevrolet Express 3500 come from GM GENUINE.
This group includes GM GENUINE D6068 and GM GENUINE 15676080.
Door Lock Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 15867074 | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
| GM GENUINE Fits: 6.6L V8 | D1415G | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
This table covers the Door Lock switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
GM GENUINE supplies both parts for the 2021 Chevrolet Express 3500.
This group includes GM GENUINE 15867074 and GM GENUINE D1415G.
Driver Information Display Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 15947841 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Driver Information Display switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 15947841.
Hands Free Calling Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 22955426 | 🇺🇸 US 🇨🇦 CA | GPS 1 Vehicle Communication System (UE1) | View on Amazon |
This table covers the Hands Free Calling switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 22955426.
Hazard Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: 6.6L V8 | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 6.6L V8 | 1S11511 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Hazard Warning switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Hazard Warning Switch parts for the 2021 Chevrolet Express 3500 come from 2 brands — ROSTRA and WELLS.
This group includes ROSTRA 640123 and WELLS 1S11511.
Headlamp Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Popular Fits: 6.6L V8 | 920053 | 🇺🇸 US 🇨🇦 CA | with Dimmer Switch | View on Amazon |
| BWD/NIEHOFF Fits: 6.6L V8 | S16145 | 🇺🇸 US 🇨🇦 CA | with Dimmer | View on Amazon |
| VEMO Fits: 6.6L V8 | V51730130 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 6.6L V8 | 84948801 | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
| ROSTRA Fits: 6.6L V8 | 650069 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | CBS1446 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 6.6L V8 | 1S8827 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the column or dash switches that control the exterior lamps. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
7 Headlamp Switch parts for the 2021 Chevrolet Express 3500 come from 7 brands — DORMAN, BWD/NIEHOFF, VEMO and 4 other brands. The "Popular" part is DORMAN 920053.
The Economy section: 3 options from DORMAN, BWD/NIEHOFF and VEMO. DORMAN 920053 is listed in this group.
Standard Replacement: 4 parts, from GM GENUINE, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand. A representative part number is GM GENUINE 84948801.
Part numbers include DORMAN 920053, BWD/NIEHOFF S16145 and VEMO V51730130, among others listed above.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 85619198 | 🇺🇸 US 🇨🇦 CA | Labeled 85619198,84126104Driver Side Inflation Restraint System (AJ3), Driver and Passenger Front Seat Inflatable Restraint System (AK5), Active Brake Control (JL4) | View on Amazon |
| WELLS Fits: 6.6L V8 | 1S16361 | 🇺🇸 US 🇨🇦 CA | Terminal Type: Pin | View on Amazon |
This table covers the ignition switches that feed the starter circuit. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Ignition Starter Switch parts for the 2021 Chevrolet Express 3500 come from 2 brands — GM GENUINE and WELLS.
Listed part numbers: GM GENUINE 85619198 and WELLS 1S16361.
Instrument Panel Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | CBS1446 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 6.6L V8 | 1S8827 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Instrument Panel Dimmer switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Instrument Panel Dimmer Switch parts are listed for the 2021 Chevrolet Express 3500, from STANDARD MOTOR PRODUCTS and WELLS.
Listed part numbers: STANDARD MOTOR PRODUCTS CBS1446 and WELLS 1S8827.
Neutral Safety Switch / Range Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO Fits: 6.6L V8 | V57730002 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Neutral Safety Switch / Range sensors. Typical signs include a warning lamp, a stored code, or a reading that drops out when the harness is wiggled. Inspect the connector and ground before replacing the sensor — wiring faults are often condemned as bad sensors.
One part is listed for the 2021 Chevrolet Express 3500 — VEMO V57730002.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.6L V8 | 926397 | 🇺🇸 US 🇨🇦 CA | 3 Way with Leadswith Flat Connector | View on Amazon |
| HOLSTEIN Fits: 6.6L V8 | 2OPS0062 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UNITED MOTOR PRODUCTS Fits: 6.6L V8 | OPS322 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WALKER PRODUCTS Fits: 6.6L V8 | 2561004 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| STANDARD MOTOR PRODUCTS Popular Fits: 6.6L V8 | PS623 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangle, OvalSensor Only | View on Amazon |
| WELLS Popular Fits: 6.6L V8 | 1S12693 | 🇺🇸 US 🇨🇦 CA | Connector Gender: Female | View on Amazon |
| GM GENUINE Fits: 6.6L V8 | 12698766 | 🇺🇸 US 🇨🇦 CA | 6 speed Automatic trans. | View on Amazon |
This table covers the senders and switches that report oil pressure to the gauge or lamp. Typical signs include a lamp that stays on, or a gauge that never moves. Confirm power and ground at the connector before replacing the sender or switch.
7 Oil Pressure Sender / Switch parts are listed for the 2021 Chevrolet Express 3500, from DORMAN, HOLSTEIN, UNITED MOTOR PRODUCTS and 4 other brands. STANDARD MOTOR PRODUCTS PS623 carries the "Popular" badge.
Economy: 4 parts, from DORMAN, HOLSTEIN, UNITED MOTOR PRODUCTS and 1 other brand. A representative part number is DORMAN 926397.
The Standard Replacement section: 3 options from STANDARD MOTOR PRODUCTS, WELLS and GM GENUINE. STANDARD MOTOR PRODUCTS PS623 is listed in this group.
Part numbers include STANDARD MOTOR PRODUCTS PS623, DORMAN 926397 and HOLSTEIN 2OPS0062, among others listed above.
Outside Mirror Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 20945027 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
This table covers the Outside Mirror switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 20945027.
Parking Brake Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 15045983 | 🇺🇸 US 🇨🇦 CA | Voltage: 12 VDC | View on Amazon |
This table covers the Parking Brake switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 15045983.
Passenger Air Bag Disable Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 23176154 | 🇺🇸 US 🇨🇦 CA | Manual Suppression Inflatable Restraint Instrument Panel Module Switch (C99)Except Canadian (Z49) | View on Amazon |
| GM GENUINE Fits: 6.6L V8 | 23176155 | 🇺🇸 US 🇨🇦 CA | Manual Suppression Inflatable Restraint Instrument Panel Module Switch (C99), Canadian (Z49) | View on Amazon |
This table covers the Passenger Air Bag Disable switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Passenger Air Bag Disable Switch parts for the 2021 Chevrolet Express 3500 come from GM GENUINE.
Part numbers include GM GENUINE 23176154 and GM GENUINE 23176155.
Power Brake Booster Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 84190381 | 🇺🇸 US 🇨🇦 CA | Brake Warning Indicator System (UJ1) | View on Amazon |
This table covers the Power Brake Booster switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 84190381.
Power Window Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 6.6L V8 | 901232 | 🇺🇸 US 🇨🇦 CA | Front Left2 Button | View on Amazon |
| SKP Fits: 6.6L V8 | SKDWS217 | 🇺🇸 US 🇨🇦 CA | LeftBlack | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 6.6L V8 | 84806723 | 🇺🇸 US 🇨🇦 CA | Instruction Manual Included: No | View on Amazon |
| GM GENUINE Popular Fits: 6.6L V8 | 10386883 | 🇺🇸 US 🇨🇦 CA | Front RightExc. 9T7RH Door | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | DWS288 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | DWS217 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| WELLS Fits: 6.6L V8 | 1S13629 | 🇺🇸 US 🇨🇦 CA | Front Right | View on Amazon |
| WELLS Fits: 6.6L V8 | 1S13986 | 🇺🇸 US 🇨🇦 CA | Front Left | View on Amazon |
This table covers the switches that command each window motor. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
8 Power Window Switch parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE, STANDARD MOTOR PRODUCTS, WELLS and 2 other brands. GM GENUINE 84806723 carries the "Popular" badge.
Economy: 2 parts, from DORMAN and SKP. A representative part number is DORMAN 901232.
The Standard Replacement section: 6 options from GM GENUINE, STANDARD MOTOR PRODUCTS and WELLS. GM GENUINE 84806723 is listed in this group.
Listed part numbers: GM GENUINE 84806723, DORMAN 901232 and SKP SKDWS217, plus the other parts above.
Steering Wheel Audio Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 25851951 | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
| WELLS Fits: 6.6L V8 | 1S16637 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
This table covers the Steering Wheel Audio Control switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
2 Steering Wheel Audio Control Switch parts are listed for the 2021 Chevrolet Express 3500, from GM GENUINE and WELLS.
This group includes GM GENUINE 25851951 and WELLS 1S16637.
Tow Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 15860532 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Tow switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
This group shows a single part: GM GENUINE 15860532.
Traction / Stability Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 20929489 | 🇺🇸 US 🇨🇦 CA | Active Brake Control (JL4) | View on Amazon |
This table covers the Traction / Stability Control switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 20929489.
Transmission-Automatic Fluid Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| TRANSGO Fits: 6.6L V8 | PSR5 | 🇺🇸 US 🇨🇦 CA | Pressure Switch Repair Kit | View on Amazon |
This table covers the Transmission-Automatic Fluid Pressure switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — TRANSGO PSR5.
Transmission-Automatic Manual Shift Shaft Position Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 6.6L V8 | 24258550 | 🇺🇸 US 🇨🇦 CA | 6 speed Automatic trans.INTERNAL MODE SWITCH | View on Amazon |
This table covers the Transmission-Automatic Manual Shift Shaft Position switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
One part is listed for the 2021 Chevrolet Express 3500 — GM GENUINE 24258550.
Turn Signal Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BWD/NIEHOFF Fits: 6.6L V8 | S16145 | 🇺🇸 US 🇨🇦 CA | Turn Indicator Switch | View on Amazon |
| VEMO Fits: 6.6L V8 | V51730181 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 6.6L V8 | D811C | 🇺🇸 US 🇨🇦 CA | INCLUDES LEVER AND HAZARD KNOB | View on Amazon |
| WELLS Popular Fits: 6.6L V8 | 1S11511 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ROSTRA Fits: 6.6L V8 | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | CBS1945 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the combination / turn-signal switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
6 Turn Signal Switch parts are listed for the 2021 Chevrolet Express 3500, from BWD/NIEHOFF, VEMO, GM GENUINE and 3 other brands. GM GENUINE D811C carries the "Popular" badge.
Economy: 2 parts, from BWD/NIEHOFF and VEMO. A representative part number is BWD/NIEHOFF S16145.
The Standard Replacement section: 4 options from GM GENUINE, WELLS, ROSTRA and 1 other brand. GM GENUINE D811C is listed in this group.
Part numbers include GM GENUINE D811C, BWD/NIEHOFF S16145 and VEMO V51730181, among others listed above.
Wiper / Washer Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BWD/NIEHOFF Fits: 6.6L V8 | S16145 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA Fits: 6.6L V8 | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS Fits: 6.6L V8 | CBS1945 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS Fits: 6.6L V8 | 1S11511 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Wiper / Washer switches. Typical signs include a function that works intermittently, or a click without the accessory coming on. Inspect the connector behind the switch; heat-damaged terminals will kill the new part too.
4 Wiper / Washer Switch parts for the 2021 Chevrolet Express 3500 come from 4 brands — BWD/NIEHOFF, ROSTRA, STANDARD MOTOR PRODUCTS and 1 other brand.
The Economy section: 1 option from BWD/NIEHOFF. BWD/NIEHOFF S16145 is listed in this group.
Standard Replacement: 3 parts, from ROSTRA, STANDARD MOTOR PRODUCTS and WELLS. A representative part number is ROSTRA 640123.
Listed part numbers: BWD/NIEHOFF S16145, ROSTRA 640123 and STANDARD MOTOR PRODUCTS CBS1945, plus the other parts above.
Buying Electrical Switch & Relay Parts for a 2021 Chevrolet Express 3500
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Match the engine first. Every electrical switch & relay part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Power Window Switch and Headlamp Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Chevrolet Express 3500?
Our catalog currently lists 75 electrical switch & relay parts for the 2021 Chevrolet Express 3500 across 32 subcategories and 15 brands, covering all 3 engine options (2.8L L4 DIESEL Turbocharged, 4.3L V6 and 6.6L V8). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 Chevrolet Express 3500 engines?
Yes. Every electrical switch & relay part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of electrical switch & relay problems on a 2021 Chevrolet Express 3500?
Common symptoms include accessories that work intermittently, a click without action, or one function dead while its fuse tests fine. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, inspect the connector terminals behind any failed switch — heat damage there will kill the new part too.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2021 Chevrolet Express 3500 was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2021 Chevrolet Express 3500?
First match the engine — each row shows which engine(s) the part fits. Then swap a suspect relay with an identical known-good one from the fuse box before buying — it is the fastest diagnostic there is. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2021 Chevrolet Express 3500
Electrical Switch & Relay Parts for Other Chevrolet Express 3500 Years
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Manufacturer names, model designations and part numbers are used for identification and fitment reference only. AutoFactsDB is an independent catalog and is not affiliated with, endorsed by, or sponsored by any vehicle manufacturer displayed on this page.