Fault Code U0420
Code meaning, symptoms, possible causes, part number, and estimated cost.
U0420
Invalid Data Received From Control Module
Code U0420 indicates that the Diesel Engine Control Module received invalid or unexpected data from another control module on the vehicle's communication network.
Part Details
Part Name
Diesel Engine Control Module
Reference P/N (OEM)
N/A
General part number for this fault code — not necessarily for your specific vehicle
Estimated Cost
₪1500 - ₪6000
Engine Location
Engine compartment
Symptoms
- Reduced engine performance
- Hard starting
- Increased fuel consumption
- Check Engine light on
Possible Causes
- 1Diesel Engine Control Module (ECM) fault
- 2Damaged wiring or connectors
- 3Fault in a connected module (e.g., TCM)
- 4CAN Bus communication interference
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