The 2017 Freightliner Cascadia has 18 electrical switch & relay parts with verified fitment on this page — 7 part types and 5 brands, covering all 6 engine options (11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged and more). Each part includes a manufacturer part number and application notes.
On the 2017 Freightliner Cascadia, the switch and relay system covers the switches, relays and flashers that route power to everything the driver touches. 14 parts of the 18 listed are Blower Switch (5 parts), Oil Pressure Sender / Switch (5 parts) and A/C Refrigerant Pressure Switch (4 parts). The other 4 part types cover the remaining 4 parts.
The 2017 Freightliner Cascadia was sold with 6 engines. 8 parts fit every engine; the other 10 are engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2017 Freightliner Cascadia electrical switch & relay parts are DORMAN (7 parts), UAC (6 parts) and WELLS (2 parts), plus 2 more brands. Quality grades include Economy and Standard Replacement.
Each part number listed for the 2017 Freightliner Cascadia opens a page with every vehicle that part fits.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2017 Cascadia engines | 9047890 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| UAC Fits: all 2017 Cascadia engines | SW11204C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Binary Hpco/Lpco Switch | View on Amazon |
| UAC Fits: all 2017 Cascadia engines | SW10080C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Pressure Transducer | View on Amazon |
| UAC Fits: all 2017 Cascadia engines | SW11189C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | HPCO 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.
4 A/C Refrigerant Pressure Switch parts for the 2017 Freightliner Cascadia come from 2 brands — UAC and DORMAN. Every part fits all 6 engine options (11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged and more).
Part numbers include DORMAN 9047890, UAC SW11204C and UAC SW10080C, among others listed above.
Blower Switch
Economy
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | SW1000C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Blower Switch Rotary | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| WELLS Fits: 11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | 1S15851 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: 11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | SW11436 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Blower Switch Rotary | View on Amazon |
| UAC Fits: 11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | SW11436C | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Blower Switch Rotary | View on Amazon |
| WELLS Fits: 14.9L L6 DIESEL Turbocharged | 1S15851 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
5 Blower Switch parts for the 2017 Freightliner Cascadia come from 2 brands — UAC and WELLS.
The Economy section lists 1 option from UAC — the catalog's value-priced group. UAC SW1000C is listed in this group.
In the Standard Replacement grade, WELLS supplies 1 part: built to original-equipment specification. A representative part number is WELLS 1S15851.
3 further parts sit outside the graded sections, with the same engine-level match.
This group includes UAC SW1000C, WELLS 1S15851 and UAC SW11436 and the remaining parts above.
Clutch Pedal Position / Starter Safety Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2017 Cascadia engines | 9015207 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon |
This table covers the Clutch Pedal Position / Starter Safety 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 2017 Freightliner Cascadia — DORMAN 9015207.
Headlamp Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2017 Cascadia engines | 9015208 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
One part is listed for the 2017 Freightliner Cascadia — DORMAN 9015208.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 11.9L, 11.9L DIESEL, 14.9L L6 DIESEL Turbocharged | 9045050 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| DORMAN Fits: 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | 9047326 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Engine Code DD16Detroit Diesel engine | View on Amazon |
| GPD Fits: 11.9L, 11.9L DIESEL, 14.9L L6 DIESEL Turbocharged | 1815437 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| GPD Fits: 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged, 15.6L L6 DIESEL Turbocharged | 1815433 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | View on Amazon | |
| WALKER PRODUCTS Fits: 11.9L, 11.9L DIESEL, 14.9L L6 DIESEL Turbocharged | 10011004 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Cummins OEM # 4921517 | 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 2017 Freightliner Cascadia come from 3 brands — DORMAN, GPD and WALKER PRODUCTS.
Part numbers include DORMAN 9045050, DORMAN 9047326 and GPD 1815437, among others listed above.
Outside Mirror Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2017 Cascadia engines | 9015202 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | Front 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 2017 Freightliner Cascadia — DORMAN 9015202.
Power Window Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2017 Cascadia engines | 9015203 | 🇺🇸 US 🇨🇦 CA 🇲🇽 MX | 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.
This group shows a single part: DORMAN 9015203.
Buying Electrical Switch & Relay Parts for a 2017 Freightliner Cascadia
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. Some electrical switch & relay parts fit every engine; others are 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: Blower Switch and Oil Pressure Sender / Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2017 Freightliner Cascadia?
Our catalog currently lists 18 electrical switch & relay parts for the 2017 Freightliner Cascadia across 7 subcategories and 5 brands, covering all 6 engine options (11.9L, 11.9L DIESEL, 12.8L L6 DIESEL Turbocharged, 14.8L L6 DIESEL Turbocharged and more). Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2017 Freightliner Cascadia engines?
Some do. 8 parts fit every engine; the other 10 are engine-specific. Each row (and the filter at the top) shows which. 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 2017 Freightliner Cascadia?
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 2017 Freightliner Cascadia 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 2017 Freightliner Cascadia?
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 2017 Freightliner Cascadia
Electrical Switch & Relay Parts for Other Freightliner Cascadia Years
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