Detroit Diesel Mail In Electronic Repairs
At The ECU Pro, we are your reliable partner for mail-in repair services specializing in Detroit Diesel engine electronics. We focus on essential components such as the CPC (Control Powertrain Controller) and MCM (Motor Control Module), which are vital for controlling your diesel engines. Understanding the importance of minimizing downtime, we've streamlined our services to offer you the utmost convenience and efficiency through our mail-in program.
Each repair is meticulously carried out by our expert technicians and thoroughly tested in actual Detroit Diesel engines to ensure each part is 100% working before it leaves our facility. All our services are plug and play.

Dedicated Support Team

Repairs Tested in Actual Trucks
Carmine Colantuono




Was quick and a great price.
20 hours ago
4.86 average rating from 3782 reviews

CPC4 Module Repairs Service - Plug and Play
At The ECU Pro, we provide expert mail-in repair services for Common Powertrain Controllers (CPC) on Detroit Diesel engines, helping you minimize downtime with our express 1-2 day repair option or our standard 3-5 day service. Trust our skilled technicians to restore your CPC to optimal performance quickly and efficiently.
Symptoms of a failed CPC includes:
- Intermittent throttle or dead throttle
- Non start conditions
- CPC hardware failure with code SPN 609 FMI 12
- Check engine light is on for CPC
- ABS engine light due to CPC
- DEF engine light from CPC failure

Detroit Diesel ECU / ECM / MCM Repairs - Plug and Play
We offer an expert mail-in repair services for Motor Control Modules (MCM), Engine Control Modules (ECM), and Powertrain Control Modules (PCM) for Detroit Diesel engines. Our goal is to provide you with a reliable solution that gets your engine back up and running with minimal downtime. Our convenient mail-in program allows you to send in your faulty modules for prompt evaluation and professional repair—helping you get back on the road quickly and efficiently.
Symptoms of a failed MCM include:
- Engine misfire repairs
- Vehicle non-start
- Internal engine control unit faults
- Water-damaged ECU / ECM / MCM
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