Network
generic / SAE
U0171
Lost Communication with Restraints Rear Sensor "A"
The Restraints Rear Sensor "A" has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. A rear crash sensor is unreachable, affecting rear airbag deployment. Safety-critical. 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 / 71
Possible causes
- Rear sensor unpowered high
- Wiring to rear sensor broken medium
- Gateway module routing CAN messages incorrectly 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: 100–1200 €
- Estimated time: 1–4 h
- Component: restraints rear sensor
- Component: can bus wiring
- MIL / check engine light
Sources
References
sae:J2012