Red Cummins CM871 ECM with top-mounted electrical connectors.

Price

Ready for a quick repair?

Mail in your device for a quick and hassle-free repair.

Step 1: Place your order
Step 2: Provide repair details & ship item.
Step 3: Receive a repaired module within days, not weeks.

Repaired within days, not weeks

60% Faster Turnaround Time Than Dealerships

Hassle Free Warranty

How do I know whether the ECM or wiring is the issue?

Verify power, ground, and CAN wiring at the ECM connector. If these check out but symptoms persist, the ECM is likely the cause.

Will my ISX lose its tune or calibration?

No. Because we repair your original ECM, your programming typically remains intact.

Can I still move the truck with the ECM removed?

No. The truck will not run without the ECM installed.

What if my ECM is too damaged to repair?

We will contact you with findings and options before proceeding.

Does heat cause CM871 failures?

Yes. Heat is one of the biggest contributors to solder fatigue inside CM871 controllers.

Cummins CM871 ECM Repair for ISX Engines

Name: Cummins CM871 ECM Repair for ISX Engines
Brand: Cummins
Price: 650.0 USD
Availability: InStock

A failing Cummins CM871 ECM can cause no-start situations, fault code 1117, unexpected derates, poor communication with diagnostic tools, or random shutdowns. Instead of paying for a costly replacement and reprogramming, our service repairs your original module so you can keep your existing calibration.

We specialize in Cummins ISX CM871 controllers found in many highway tractors. You send us your ECM, we perform board-level diagnostics and repairs, and return it ready to reinstall. This is a mail-in repair service—you send your ECM to us for evaluation and repair.

Common Symptoms of a Failing CM871 ECM

Cranks but does not start despite fuel and sensor checks
Fault code 1117
Intermittent starting, especially when the ECM is warm
Derate or limp mode with persistent CM871-related fault codes
No communication with diagnostic tools
Engine shuts off unexpectedly and restarts after cooling
Multiple unrelated fault codes appearing at once
Completely unresponsive ECM despite verified power and ground

Why CM871 ECMs Fail

Thermal cycling: Repeated heating and cooling fatigues solder joints
Vibration: Heavy-duty trucks transmit vibration that weakens components
Electrical stress: Jump starts, low voltage, and poor grounds damage circuits
Moisture and contamination: Can lead to corrosion and shorts
Age: Components drift or degrade after years of operation

What Our CM871 Repair Service Includes

Internal inspection under magnification
Verification of power and ground circuits
Testing of control, driver, and communication circuits
Replacement of failed or unstable components
Solder joint rework in high-stress areas
Full board cleaning to remove contaminants
Bench testing for stability before return

Supported Applications

This service covers Cummins ISX CM871 ECMs used in:

Freightliner
Kenworth
Peterbilt
Other heavy-duty Class 8 platforms

Mail-In Repair Process

Place your order
Remove the ECM from your truck (disconnect battery first)
Ship the ECM to us securely packaged
We diagnose and repair the module
We return your original ECM ready to reinstall

Service Details

Service Type: Board-level repair of your original ECM
Programming: Your existing calibration is usually preserved
Turnaround: 1–3 business days in-house
Warranty: Provided with your repair

Please ship your module to the following address:

Module Repair Lab
8698 Elk Grove Blvd Ste 1, Elk Grove, CA 95624

Make sure to include your contact information and order number inside the package to help us process your repair quickly.

We recommend using a trackable and insured shipping method to ensure safe delivery. Once your repair is complete, we will ship it back to the return address you provide.

If you have any questions, feel free to contact us.

How it Works

We offer a cost-effective solution to pricey dealership part replacements, saving you a significant amount of money. Our approach goes beyond simply repairing the faulty part – we address the underlying issue and use top-quality upgraded parts to ensure a long-lasting fix. We stand behind our service with a 100% satisfaction guarantee or your money back.

To get started, carefully remove the part from your vehicle. If you’re unsure how to do this, you can take it to your local body shop for assistance.
Once the part is removed, pack it securely in a suitable box to prevent any damage during transit.
Don’t forget to print out your order confirmation page and include it in the package, along with your name, return address, and phone number

Warranty

Warranty coverage varies depending on the specific product being repaired. Please refer to the individual product page for the most up-to-date warranty information.

In general, our warranty covers the repaired part for a defined period beginning on the date of repair. If a malfunction occurs within the warranty period, we will repair the item at no additional cost. In rare cases where the item is deemed irreparable, we reserve the right to either replace the circuit board or refund the cost of repair, at our discretion.

This warranty is non-transferable and applies only to the original purchaser. Damage resulting from misuse, accidents, improper installation, or unauthorized repairs is not covered and will void the warranty.

If you have any questions regarding the warranty for your specific repair, please contact us directly.

FAQs

8698 Elk Grove Blvd #1, Elk Grove, CA 95624

info@modulerepairlab.com

Turnaround time is fast—typically 2 to 3 business days once we receive your module.

You can pay on the website with PayPal or a credit card or you can send the module in with your information and we will contact you for a credit card after the repairs have been performed.

Yes, warranty depends on the module being repaired.