CPC4 Repair

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CPC4 Module

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CPC4 Services

⭐⭐⭐⭐⭐ 106 reviews

Repair                $1,200

Diagnostic           $100 (Free with Repair)

Programming        Included With Price

Prices can vary depending on market demands.

1 Year Warranty

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CPC4 Repair

Recently, CPC4 module repair has become extremely important to the trucking industry. New CPC modules have become extremely hard to find and have been on national backorder for months. We know that truckers need to get back on the road, so we’ve created custom solutions to the CPC shortage.

What is A CPC4

CPC stands for Common Powertrain Controller and it is the interface between the MCM (Motor Control Module) and other vehicle functions like the transmission, dash gauges, gas & brake pedals, cruise control and engine brake switches. They are extremely important to the functionality of your truck.

You can find an entire virtual manual for the CPC here: Link


Our repair service covers all CPC4 (Common Powertrain Controller) module issues for 2014, 2015, 2016, 2017, 2018, and 2019 Freightliner Cascadia trucks.

Our repair service is designed to help solve the most common issues for diesel engines including:

  • No start / Intermittent start
  • Dead throttle / Intermittent throttle 
  • CPC reads as a different module (reads as CPC2, TCM, etc.)
  • CPC Hardware Failure Fault Code SPN 609 FMI 12

Our repair may also address the following issues with communication failure:

  • Check engine light is on
  • ABS light stays on
  • DEF light stays on 
  • Instrument cluster loses communication

This repair covers the following alternate and replacement part numbers:

  • A0034461002 / 001
  • A0034461002 / 002
  • A0034461002 / 003
  • A0034461002 / 004
  • A0034461002 / 005
  • A0034461102 / 002
  • A0034461102 / 003
  • A0034461102 / 004
  • A0034461102 / 005
  • A0034461202 / 001
  • A0034461302 / 001
  • A0064463402 / 001


If your module fails at any point within a year of repair, we’ll repair the item again for you. On the rare occasion that the item becomes unrepairable, we will either replace the circuit board entirely or refund the cost of the repair.

Why Repair Your CPC With Truck ECM

  • We can accurately diagnose, repair and program CPCs.
  • Our custom CPC simulator allows for a precise diagnostic.
  • With over 12 years of experience, we have put the time into researching these modules extensively for 100% successful repairs.
  • There are no internal components we cannot repair or replace in the CPC module.
  • We reprogram CPCs which is a very important part since programming is commonly damaged when a CPC fails.
  • We offer a 1-Year warranty on all repaired CPCs.

CPC4 Repairing Process

At Truck ECM, we have a detailed process that helps us get your CPC4 module repaired fast and with 100% success.

We start by diagnosing your unit and finding out if the unit is defective or not. In the case where the CPC is not working properly, we proceed by cleaning and inspecting the outer core for any cracks or holes. We then open the unit and diagnose the internal components. Then we replace any electronic components that are not functioning properly or are about to fail. The CPC is then tested for a 100% quality pass. Next, the programming is analyzed and the unit is programmed if needed. The unit is finally reassembled and returned to the customer. All this within 1 to 2 days.

For more information on our module repair service click here.

Fix Your CPC Today

Fill out our online Work Order in the link below to get started or call us directly to set up a repair. 


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Get back on the road faster with our expedited repairs and 1-2 day shipping across America. We've fixed over 15,000 thousand ECMs and look forward to working with you.

Find out if your ECM is defective or not before replacing it.