OBD-II code · Network
U01B6 Lost Communication With Fuel Heater Control Module
ECU lost communication with fuel heater control module (heats diesel fuel to prevent waxing in cold).
Is it safe to drive with U01B6?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyModule unpowered
- Less likelyGateway module routing CAN messages incorrectly
- Less likelyCAN terminating resistor (120 Ω) drifted out of spec
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.5–3 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Heater Module, Can Bus
Related codes
- U01B3Lost Communication With Brake Blending Actuator
- U01B4Lost Communication With Brake System Control Module B
- U01B5Lost Communication With Catalyst Heater Control Module
- U01B7Lost Communication With Switch Input Module A
- U01B8Lost Communication With Switch Input Module B
- U01B9Lost Communication With Switch Input Module C
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.