Truck Year/Model/Engine: 2016 Freightliner Cascadia Detroit DD15

After turning the truck on one morning, the check engine came on. So I plugged in my scanner tool by OTR Performance. The codes were SPN 91 FMI 8, SPN 2623 FMI 8 & SPN 111 FMI 3. What was wrong with my truck was the CPC4 (Common Powertrain Control Module). After replacing the CPC4, the accelerator pedal started to work properly again and the other codes were cleared also. Good Luck!

Scanner Tool I Use:

OTR Performance Tool ✅🔧 https://otrperformance.com/?ref=thegoldentrucker

FREE SHIPPING Coupon Code: THEGOLDENTRUCKER

Fault Codes Overview

Video on how to replace the CPC4

Summary

1. Faulty CPC4 Diagnosis and Replacement – The video discusses diagnosing multiple unrelated fault codes (e.g., accelerator pedal, ambient temperature, coolant) attributed to a faulty CPC4 (Common Powertrain Controller). – The CPC4 replacement process is detailed, emphasizing it can be purchased and programmed at a dealership or third-party shop, avoiding unnecessary towing costs

2. Challenges During Breakdown – The truck experienced intermittent issues like the inability to accelerate beyond 5 mph, unexpected engine revving, and multiple fault codes. This required careful troubleshooting and crawling to nearby repair shops .

3. DIY How To Replace The CPC4 Freightliner Cascadia – The CPC4 is easily accessible behind a panel with four screws. Tools needed include a T25 screwdriver. Power must be disconnected before installation.

4. Cost of Replacement and Programming – The CPC4 replacement cost is approximately $1,400, with additional fees for programming ($345) and potential core charges of $1,200 if the old part isn’t returned. – The total cost incurred for the replacement was $1,814 after returning the old CPC4.

5. Final Results and Observations – After replacement, the truck performed as expected, resolving previous issues. However, the engine mileage reset to zero, which is a known behavior of CPC4 replacements.