Powertrain
generic / SAE
P23A9
Communication Fault Forced Engine Shutdown
A safety-critical communication loss between control modules has triggered a forced engine shutdown. The ECU could not validate signals it needs to operate safely (e.g. throttle commands, brake state) and stopped the engine.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number3 / A9
Possible causes
- Bus communication lost high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec low
Inspection / repair
- Difficulty: hard
- DIY: shop recommended
- Estimated cost: 200–2000 €
- Estimated time: 1–6 h
- Component: powertrain bus
- Component: ecm
- MIL / check engine light
Sources
References
sae:J2012