Network
generic / SAE
U01B6
Lost Communication With Fuel Heater Control Module
ECU lost communication with fuel heater control module (heats diesel fuel to prevent waxing in cold).
SystemNetwork
Typegeneric / SAE
GroupU0
Range / number1 / B6
Possible causes
- Module unpowered high
- Gateway module routing CAN messages incorrectly low
- CAN terminating resistor (120 Ω) drifted out of spec 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: possible
- Estimated cost: 80–600 €
- Estimated time: 0.5–3 h
- Component: fuel heater module
- Component: can bus
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012