Network
generic / SAE
U0166
Lost Communication with Auxiliary Heater Control Module
The Auxiliary Heater Control Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. The auxiliary or parking-heater control is lost. 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 / 66
Possible causes
- Auxiliary heater unpowered high
- CAN wiring to auxiliary heater 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: medium
- DIY: shop recommended
- Estimated cost: 80–1200 €
- Estimated time: 1–4 h
- Component: auxiliary heater module
- Component: can bus wiring
Sources
References
sae:J2012