This page lists 8 electrical switch & relay parts for the 2021 International HX, across 5 part types, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Every part shows its brand, manufacturer part number and fitment notes.
On the 2021 International HX, 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 Oil Pressure Sender / Switch (3 parts), A/C Refrigerant Pressure Switch (2 parts) and A/C Clutch Switch (1 part). The other 2 part types cover the remaining 2 parts.
The 2021 International HX was sold with both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. 5 parts fit every engine; the other 3 are engine-specific. Each part shows which engine(s) it fits.
4 brands supply electrical switch & relay parts for the 2021 International HX, led by UAC (3 parts), DORMAN (3 parts) and GPD (1 part), plus 1 more brand.
Each part number listed for the 2021 International HX opens a page with every vehicle that part fits.
A/C Clutch Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: all 2021 HX engines | SW11200C | 🇺🇸 US 🇨🇦 CA | Switch | 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.
This group shows a single part: UAC SW11200C.
A/C Refrigerant Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 HX engines | 9049920 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| UAC Fits: all 2021 HX engines | SW12044C | 🇺🇸 US 🇨🇦 CA | Low 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.
2 A/C Refrigerant Pressure Switch parts are listed for the 2021 International HX, from DORMAN and UAC. All of them fit every engine offered in the 2021 HX.
Part numbers include DORMAN 9049920 and UAC SW12044C.
A/C System Relay
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| UAC Fits: all 2021 HX engines | RE8434C | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the relays that control the A/C System 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 International HX — UAC RE8434C.
Air Brake Pressure Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: all 2021 HX engines | 9016001 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Air Brake 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.
This group shows a single part: DORMAN 9016001.
Oil Pressure Sender / Switch
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| DORMAN Fits: 14.9L L6 DIESEL Turbocharged | 9045050 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| GPD Fits: 14.9L L6 DIESEL Turbocharged | 1815437 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| WALKER PRODUCTS Fits: 14.9L L6 DIESEL Turbocharged | 10011004 | 🇺🇸 US 🇨🇦 CA | HX520Cummins 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.
3 Oil Pressure Sender / Switch parts are listed for the 2021 International HX, from DORMAN, GPD and WALKER PRODUCTS.
Part numbers include DORMAN 9045050, GPD 1815437 and WALKER PRODUCTS 10011004.
Buying Electrical Switch & Relay Parts for a 2021 International HX
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: Oil Pressure Sender / Switch and A/C Refrigerant Pressure Switch .
Frequently Asked Questions
How many electrical switch & relay parts fit the 2021 International HX?
Our catalog currently lists 8 electrical switch & relay parts for the 2021 International HX across 5 subcategories and 4 brands, covering both the 12.4L L6 DIESEL Turbocharged and the 14.9L L6 DIESEL Turbocharged. Each part is matched to the engine(s) it fits.
Do electrical switch & relay parts differ between 2021 International HX engines?
Some do. 5 parts fit every engine; the other 3 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 2021 International HX?
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 International HX 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 International HX?
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 International HX
Electrical Switch & Relay Parts for Other International HX 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.