Common Symptoms
- Check Engine Light illuminated
- Engine may not start or cranks but won't fire
- Intermittent stalling or sudden engine shutdown
- Loss of communication with scan tool
- Erratic engine performance or limp mode activation
- Multiple unrelated fault codes stored simultaneously
Most Likely Root Causes
- Faulty or failing engine control module
- Low battery voltage or poor charging system performance
- Corroded or damaged ECM power or ground connections
- Internal ECM software corruption or memory fault
- Water intrusion or moisture damage to control module
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Component Location
Engine control module is typically mounted in the engine bay near the firewall or on the inner fender, or sometimes inside the cabin under the dashboard.
Manufacturer Notes
This code indicates internal ECM processor or memory failure and often requires control module replacement after verifying power and ground integrity.
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Heavy-duty trucks often throw both OBD-II and J1939 faults simultaneously. AI Diesel Tech handles both protocols in a single guided session.
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