$1,395
+ $500 refundable core deposit (90-day return window). No-deposit option available at checkout: send your core first.
Usually ships same day on orders in by 2 PM CT
2-year transferable warranty · Programmed to your truck at no charge · Core deposit refunded on return
Prefer to fix your own unit?
Flat rebuild $745 (bench fee included) · 3-day turnaround — you keep your original ECM.
Start a repair instead →
Flat rebuild $745 (bench fee included) · 3-day turnaround — you keep your original ECM.
Start a repair instead →
| Part Number | WAX |
| Brand | Caterpillar |
| Condition | Remanufactured |
| SKU | NL-CAT-C7-WAX |
| ADEM generation | ADEM 3 (70-pin) |
| ECM P/N cross-reference | 240-5303-02, 240-5302, 10R-4091 |
About the Caterpillar C7 WAX ECM
The WAX is the ADEM 3, 70-pin engine control module for the Caterpillar C7. It is an on-highway truck ECM.
Cat's remanufactured number for this ECM is 10R-4091. It replaces the OEM ECM part numbers 240-5303-02, 240-5302.
We repair the C7 WAX ECM on the bench and stock tested remanufactured exchange units, programmed to your engine and ready to install. Send yours in for repair, or buy an exchange unit off the shelf.
Remanufactured Caterpillar ECM for C7. Programmed to your engine arrangement and ECM family. Plug and play install. Standard programming included — usually ships same day on orders in by 2 PM CT. 2-year warranty. Core exchange required. $500 core deposit refunded when your old ECM returns within 90 days.
Common Cat ECM failures we repair
Cat ADEM ECMs tend to fail the same few ways. We fix all of these on the bench, every day:
- Injector driver failure. A dead hole or misfire when the ECM stops driving an injector. We repair the driver circuit and bench-test every channel.
- Lost customer parameters. The settings programmed to your engine drop out. We recover and reload them.
- Runs, but no communication. The engine runs but won't talk to Cat ET. We get communication back so it can be read and programmed.