What it means
The fuel temperature sensor A signal is below the minimum threshold. Likely shorted to ground or 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 signals fuel temperature to the engine control module through an electrical circuit. This code sets when the sensor A signal falls below the module’s expected range, which can result from a short to ground, a failed sensor, or a poor connection.
Common causes
Most likely first.
- Signal wire shorted to ground
- Sensor failed shorted
- 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 low reading and note whether it is fixed or changes.
- Inspect fuel temperature sensor A’s connector for corrosion, moisture, loose fit, and pushed-back pins; check the nearby harness for chafing.
- Using the vehicle wiring diagram, check sensor A’s signal wire for a short to ground and inspect the circuit’s reference and ground connections.
- Test continuity and shorts with the sensor disconnected as directed by the manufacturer’s procedure, and compare results with its specification.
- If the wiring and connector are sound, test fuel temperature sensor A and replace it if it fails the manufacturer’s specification.
Common fixes
- Clean or repair corroded or loose sensor A connector terminals and restore a secure connection.
- Repair the sensor A signal wire if it is shorted to ground or damaged.
- Repair a faulty reference or ground connection in the sensor A circuit.
- Replace fuel temperature sensor A if it produces a low signal despite a sound circuit.
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 interfere with engine control and may worsen drivability or 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.