What it means
The ECU detects an electrical fault in the fuel temperature sensor A circuit. Fuel temperature input is missing or out of plausible range — typical for sensor failure or wiring open/short.
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 measures the temperature of fuel at the location specified for that sensor, and the engine control module monitors its electrical signal. This code sets when the sensor A circuit has an electrical fault or produces a signal the module cannot use as a plausible temperature input.
Common causes
Most likely first.
- Fuel temperature sensor failed
- Wiring or connector fault
Symptoms
- Check engine light on
- Hard starting or rough running
- Reduced engine performance
- Fuel economy may worsen
How to diagnose it
- Check freeze-frame data and live fuel temperature sensor A data for a missing, fixed, or implausible reading.
- With the ignition off, locate sensor A using the vehicle information and inspect its connector and accessible wiring for damage, corrosion, or a loose fit.
- Check sensor A circuit power or reference, ground, and signal as applicable using the wiring diagram and manufacturer’s specification.
- Test continuity and shorts in the sensor A wiring, including while gently moving the harness to reveal an intermittent connection.
- If wiring and connector tests pass, test fuel temperature sensor A against the manufacturer’s specification and replace it if it fails.
Common fixes
- Reconnect sensor A’s loose connector and repair poor terminal contact or corrosion.
- Repair an open, shorted, or damaged section of the fuel temperature sensor A wiring.
- Replace fuel temperature sensor A if circuit tests are sound and the sensor fails specification.
- Clear the code and confirm sensor A data is plausible after repair.
Can I keep driving?
If the engine starts and runs normally, a short trip to arrange diagnosis is generally reasonable, but avoid relying on the vehicle for demanding or long journeys if it is hard to start or losing power. Incorrect fuel-temperature data 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.