What it means
Communication with the Fuel Heater Control Module was not received as expected. This code does not specify the type of fuel heater or the conditions it is intended to address.
At a glance
- Usually lights the warning light of the system that lost communication
- Affects emissions; the car can fail an emissions test
How it works
The Fuel Heater Control Module manages or reports a fuel-heating system used on some vehicles. This code sets when expected messages from that module are missing; the code alone does not specify the heater type or the conditions it serves.
Common causes
Most likely first.
- Module unpowered
- Gateway module routing CAN messages incorrectly
- CAN 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
How to diagnose it
- Scan all modules and record freeze-frame data to see whether the fuel heater fault is accompanied by other emissions or network codes.
- Check whether the Fuel Heater Control Module responds to a scan tool and whether its status data is available.
- Inspect the module's connector and harness for looseness, corrosion, heat damage, or chafing.
- Check the module's power and ground circuits against the manufacturer's specification.
- If the supplies are sound, test the relevant communication wiring and gateway routing before concluding that the module has failed.
Common fixes
- Reconnect or repair a loose or corroded module connector.
- Repair damaged wiring or restore the module's power and ground supply.
- Repair a confirmed network or gateway routing fault.
- Replace the Fuel Heater Control Module if it remains unresponsive with verified circuits.
Can I keep driving?
The vehicle may still run, but the fuel-heating function and related emissions monitoring may be unavailable, especially in conditions where the heater is needed. Arrange diagnosis soon and watch for starting or running problems.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.