Network
generic / SAE
U0100
Lost Communication with ECM/PCM "A"
The ECM/PCM "A" has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. As this is the engine controller itself, the engine usually will not start or run while the message is missing. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / 00
Possible causes
- ECM unpowered (fuse, ground, supply wire) high
- CAN wiring to ECM broken medium
- ECM internally failed low
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 50–2000 €
- Estimated time: 0.5–8 h
- Component: ecm
- Component: can bus wiring
- MIL / check engine light
- limp mode possible
Sources
References
sae:J2012