What it means
The fuel temperature sensor A signal exceeds the maximum threshold. Likely shorted to voltage, open ground or sensor open-circuit.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Fuel Temperature sensor A reports fuel temperature to the engine control module through its signal circuit. This code sets when that signal rises above the expected range, which can happen with a short to voltage, an open sensor or ground path, or a failed sensor.
Common causes
Most likely first.
- Signal wire shorted to voltage
- Sensor open-circuit
- Connector pins corroded - high contact resistance
Symptoms
- Check engine light on
- Hard starting or rough running
- Reduced engine performance
- Fuel economy may worsen
How to diagnose it
- Check freeze-frame and live sensor A data to confirm the high reading and note whether it is fixed or changes.
- Inspect fuel temperature sensor A’s connector and harness for loose or corroded terminals, damaged insulation, or a disconnected ground path.
- Using the vehicle wiring diagram, check the sensor A signal circuit for a short to voltage and verify its ground and reference connections.
- Test circuit continuity and shorts with the sensor disconnected according to the manufacturer’s procedure and specification.
- If the circuit is sound, test fuel temperature sensor A against the manufacturer’s specification and replace it if it is open or faulty.
Common fixes
- Reconnect sensor A’s connector and repair loose, corroded, or damaged terminals.
- Repair the sensor A signal wire if it is shorted to voltage or open.
- Restore a damaged ground or reference connection in the sensor A circuit.
- Replace fuel temperature sensor A if it remains open or gives a high signal with sound wiring.
Can I keep driving?
If the vehicle runs normally, cautious driving to arrange diagnosis is generally reasonable, but avoid long or demanding trips if starting or performance is affected. The incorrect sensor A reading can affect engine control and fuel economy.
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.