What it means
The ECU detects intermittent dropouts on the fuel temperature sensor A circuit. Loose connector, chafed wiring or sensor failing thermally.
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 sends a temperature signal to the engine control module, which monitors whether that input remains usable. This code sets when the sensor A circuit drops out intermittently, often as a loose connection or damaged wire loses contact with vibration or heat.
Common causes
Most likely first.
- Connector loose or corroded
- Wiring chafed
- Connector with intermittent contact under vibration
Symptoms
- Check engine light on
- Intermittent hard starting or rough running
- Intermittent loss of power
How to diagnose it
- Review freeze-frame data and live sensor A readings for sudden dropouts or jumps, noting when they occur.
- Inspect sensor A’s connector for a loose fit, corrosion, moisture, or damaged and pushed-back pins.
- Trace the sensor A harness for chafing, heat damage, or contact with a vibrating component, and check that it is secured.
- Watch the live reading while gently moving the connector and harness to locate any movement that triggers a dropout.
- If the fault cannot be reproduced, test sensor A circuit continuity and shorts while flexing the harness, following the wiring diagram and manufacturer’s specification.
Common fixes
- Reseat and secure the sensor A connector; clean or repair terminals with poor contact.
- Repair chafed or broken wiring in the fuel temperature sensor A circuit and secure the harness away from vibration or heat.
- Replace a damaged connector or terminals that cannot maintain contact.
- Replace fuel temperature sensor A if the signal drops out with verified wiring and connections.
Can I keep driving?
If the engine runs normally, a short, cautious drive to arrange diagnosis is generally reasonable. Avoid extended trips if the intermittent fault causes hard starting or loss of power, which could recur without warning.
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.