48 Electrical switch & relay parts are listed for the 2021 Chevrolet Express 4500, in 28 part types, covering the 6.6L V8 engine. Each one has a brand, a manufacturer part number and notes that say where it fits.
On the 2021 Chevrolet Express 4500, 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 (6 parts), Oil Pressure Sender / Switch (5 parts) and Headlamp Switch (4 parts). The other 25 part types cover the remaining 33 parts.
Every part on this page is matched to the 6.6L V8 — the only engine offered in the 2021 Chevrolet Express 4500.
The most listed brands for 2021 Chevrolet Express 4500 electrical switch & relay parts are GM GENUINE (24 parts), WELLS (7 parts) and ROSTRA (5 parts), plus 7 more brands. Quality grades include Standard Replacement and Economy.
3 parts on this 2021 Chevrolet Express 4500 page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including WELLS 1S12693 (Oil Pressure Sender / Switch) and GM GENUINE 84806723 (Power Window Switch). Click any part number to see every vehicle that part fits.
A/C Compressor Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FOUR SEASONS | 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.
This group shows a single part: FOUR SEASONS 36141.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 1551388 | 🇺🇸 US 🇨🇦 CA | Fits Mating Connector Use 86792094with Integrated Circuit | View on Amazon |
| GM GENUINE | 1550618 | 🇺🇸 US 🇨🇦 CA | Air ConditioningManual Controls(C60) | View on Amazon |
| GPD | 1713410 | 🇺🇸 US 🇨🇦 CA | Transducerwith 3 Terminal(s) | 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.
3 A/C Refrigerant Pressure Switch parts for the 2021 Chevrolet Express 4500 come from 2 brands — GM GENUINE and GPD.
Part numbers include GM GENUINE 1551388, GM GENUINE 1550618 and GPD 1713410.
Auxiliary Battery Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 12135194.
Blower Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
This group shows a single part: GM GENUINE 86516210.
Brake Light Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | 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.
This group shows a single part: VEMO V51730196.
Brake Pressure Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 10218778.
Cruise Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | D1957E | 🇺🇸 US 🇨🇦 CA | Ebony | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE D1957E.
Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 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.
2 Dimmer Switch parts are listed for the 2021 Chevrolet Express 4500, from ROSTRA and WELLS.
Part numbers include ROSTRA 640123 and WELLS 1S11511.
Door Lock Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 15867074 | 🇺🇸 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.
This group shows a single part: GM GENUINE 15867074.
Driver Information Display Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 15947841.
Hands Free Calling Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 22955426.
Hazard Warning Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 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 are listed for the 2021 Chevrolet Express 4500, from ROSTRA and WELLS.
Listed part numbers: ROSTRA 640123 and WELLS 1S11511.
Headlamp Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 920053 | 🇺🇸 US 🇨🇦 CA | with Dimmer Switch | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 84948801 | 🇺🇸 US 🇨🇦 CA | Ebony | View on Amazon |
| ROSTRA | 650069 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 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.
4 Headlamp Switch parts are listed for the 2021 Chevrolet Express 4500, from DORMAN, GM GENUINE, ROSTRA and 1 other brand.
In the Economy grade, DORMAN supplies 1 part: the catalog's value-priced group. A representative part number is DORMAN 920053.
The Standard Replacement section lists 3 options from GM GENUINE, ROSTRA and WELLS — built to original-equipment specification. GM GENUINE 84948801 is listed in this group.
This group includes DORMAN 920053, GM GENUINE 84948801 and ROSTRA 650069 and the remaining parts above.
Ignition Starter Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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 |
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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 85619198.
Instrument Panel Dimmer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS | 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.
This group shows a single part: WELLS 1S8827.
Neutral Safety Switch / Range Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| VEMO | 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.
This group shows a single part: VEMO V57730002.
Oil Pressure Sender / Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 926397 | 🇺🇸 US 🇨🇦 CA | 3 Way with Leadswith Flat Connector | View on Amazon |
| WALKER PRODUCTS | 2561004 | 🇺🇸 US 🇨🇦 CA | Includes Seal | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Popular | 1S12693 | 🇺🇸 US 🇨🇦 CA | Connector Gender: Female | View on Amazon |
| GM GENUINE | 12698766 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| STANDARD MOTOR PRODUCTS | PS623 | 🇺🇸 US 🇨🇦 CA | Connector Shape: Rectangle, OvalSensor Only | 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.
5 Oil Pressure Sender / Switch parts for the 2021 Chevrolet Express 4500 come from 5 brands — DORMAN, WALKER PRODUCTS, WELLS and 2 other brands. The "Popular" part is WELLS 1S12693.
The Economy section: 2 options from DORMAN and WALKER PRODUCTS. DORMAN 926397 is listed in this group.
Standard Replacement: 3 parts, from WELLS, GM GENUINE and STANDARD MOTOR PRODUCTS. A representative part number is WELLS 1S12693.
This group includes WELLS 1S12693, DORMAN 926397 and WALKER PRODUCTS 2561004 and the remaining parts above.
Outside Mirror Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 20945027.
Parking Brake Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
This group shows a single part: GM GENUINE 15045983.
Passenger Air Bag Disable Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 23176154 | 🇺🇸 US 🇨🇦 CA | Manual Suppression Inflatable Restraint Instrument Panel Module Switch (C99)Except Canadian (Z49) | View on Amazon |
| GM GENUINE | 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.
GM GENUINE supplies both parts for the 2021 Chevrolet Express 4500.
This group includes GM GENUINE 23176154 and GM GENUINE 23176155.
Power Brake Booster Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 84190381.
Power Window Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN | 901232 | 🇺🇸 US 🇨🇦 CA | Front Left2 Button | View on Amazon |
| SKP | SKDWS217 | 🇺🇸 US 🇨🇦 CA | Left | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular | 84806723 | 🇺🇸 US 🇨🇦 CA | Instruction Manual Included: No | View on Amazon |
| GM GENUINE Popular | 10386883 | 🇺🇸 US 🇨🇦 CA | Front RightExc. 9T7RH Door | View on Amazon |
| STANDARD MOTOR PRODUCTS | DWS288 | 🇺🇸 US 🇨🇦 CA | Black | View on Amazon |
| STANDARD MOTOR PRODUCTS | DWS217 | 🇺🇸 US 🇨🇦 CA | Black | 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.
6 Power Window Switch parts for the 2021 Chevrolet Express 4500 come from 4 brands — GM GENUINE, STANDARD MOTOR PRODUCTS, DORMAN and 1 other brand. The "Popular" part is GM GENUINE 84806723.
The Economy section: 2 options from DORMAN and SKP. DORMAN 901232 is listed in this group.
Standard Replacement: 4 parts, from GM GENUINE and STANDARD MOTOR PRODUCTS. A representative part number is GM GENUINE 84806723.
This group includes GM GENUINE 84806723, DORMAN 901232 and SKP SKDWS217 and the remaining parts above.
Steering Wheel Audio Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 25851951 | 🇺🇸 US 🇨🇦 CA | Ebony | 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.
This group shows a single part: GM GENUINE 25851951.
Tow Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
One part is listed for the 2021 Chevrolet Express 4500 — GM GENUINE 15860532.
Traction / Stability Control Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 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.
This group shows a single part: GM GENUINE 20929489.
Transmission-Automatic Manual Shift Shaft Position Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | 24258550 | 🇺🇸 US 🇨🇦 CA | 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.
This group shows a single part: GM GENUINE 24258550.
Turn Signal Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE | D811C | 🇺🇸 US 🇨🇦 CA | INCLUDES LEVER AND HAZARD KNOB | View on Amazon |
| ROSTRA | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 1S11511 | 🇺🇸 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.
3 Turn Signal Switch parts for the 2021 Chevrolet Express 4500 come from 3 brands — GM GENUINE, ROSTRA and WELLS.
This group includes GM GENUINE D811C, ROSTRA 640123 and WELLS 1S11511.
Wiper / Washer Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ROSTRA | 640123 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WELLS | 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.
2 Wiper / Washer Switch parts are listed for the 2021 Chevrolet Express 4500, from ROSTRA and WELLS.
Part numbers include ROSTRA 640123 and WELLS 1S11511.
Buying Electrical Switch & Relay Parts for a 2021 Chevrolet Express 4500
On this vehicle, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches.
- Confirm you have the 6.6L V8 engine — every part on this page is matched to it.
- 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 Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 Chevrolet Express 4500?
Our catalog currently lists 48 electrical switch & relay parts for the 2021 Chevrolet Express 4500 across 28 subcategories and 10 brands, covering the 6.6L V8 engine. Each part is matched to the engine(s) it fits.
What are the signs of electrical switch & relay problems on a 2021 Chevrolet Express 4500?
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 4500 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 4500?
Every part on this page is matched to the 6.6L V8 engine. 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 4500
Electrical Switch & Relay Parts for Other Chevrolet Express 4500 Years
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