Lost Communication with ECM
The MAXXFORCE-U0100 (MaxxForce) diesel fault code means: Lost Communication with ECM. This is a moderate severity code.
- Keep driving?
- No -- stop driving
- DIY difficulty
- advanced
- Estimated cost
- $300-$3,500
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Common Symptoms
- No start
- Dash warnings
- Dead scan tool
Probable Causes (Ranked by Likelihood)
- ECM power/ground fault Likely
- CAN bus wiring short Possible
- Failed ECM Possible
Step-by-Step Diagnostic Procedure
Verify ECM power and grounds.
Check CAN bus termination resistance (should be 60 ohms).
Frequently Asked Questions
What is U0100 on a MaxxForce 13 (12.4L)?
U0100 on a MaxxForce 13 (12.4L) (2008-2014) indicates: Lost Communication with ECM. This is a known fault code on the MaxxForce engine family and typically points to the causes listed above.
Can I drive with U0100 on my MaxxForce?
No. Stop driving and arrange for towing. Continued operation risks catastrophic damage or stranding.
How much does it cost to fix MaxxForce U0100?
Repair cost is typically $300-$3,500 depending on the underlying cause and shop rate. Many MaxxForce faults (especially EGR cooler, head bolt, and VGT repairs) are major expenses that drove fleet owners to repower with Cummins or retire these trucks early.
U0100 on Other Platforms
The same code ID appears across other engines, vehicles, and equipment. Diagnostic flow varies by platform — see the matching breakdown: