What it means
A fault has been detected in the fuel rail heater control circuit. The code does not establish that the vehicle has a rail-mounted heater or that heating is intended to improve fuel atomization.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
The fuel rail heater control circuit operates a heater associated with the fuel rail on vehicles equipped with that system. This code sets when the control module detects an open circuit in the heater control path, but the code alone does not confirm the vehicle has a rail-mounted heater.
Common causes
Most likely first.
- Open in heater or wiring
- Pin pushed back out of connector body
- Cracked solder joint inside the module or sensor
Symptoms
- Check engine light
- Fuel or powertrain warning light, if equipped
- Hard starting or rough running in cold weather
- Reduced engine performance in cold conditions
How to diagnose it
- Check freeze-frame data and related fuel-heater codes to determine when the open circuit was detected and whether it coincided with cold operation.
- Use the vehicle wiring information to confirm whether a fuel rail heater is fitted and identify its control circuit.
- Inspect the identified heater, connector, and harness for disconnection, broken wires, corrosion, or pins pushed back.
- Check the relevant fuse and circuit power and ground as directed by the manufacturer's wiring diagram.
- Test continuity through the heater and its control wiring against the manufacturer's specification.
- If the heater and wiring pass, test the associated control module and output using the manufacturer's procedure.
Common fixes
- Reconnect a disconnected fuel rail heater plug or restore a loose terminal.
- Repair an open or damaged heater control wire.
- Replace a failed fuel rail heater if continuity testing confirms an internal open.
- Repair the heater control output or module if testing confirms the fault is there.
Can I keep driving?
If the engine runs normally, driving is generally possible, but cold starting or running may be affected if the vehicle uses this heater. The code is associated with emissions monitoring, so an unresolved fault may also contribute to an emissions test failure.
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.