Fuel Temperature Sensor A Circuit High

What it means

The engine computer has seen the fuel temperature sensor signal voltage rise above the maximum allowed. In most designs this is read as a very low fuel temperature, and the usual cause is an open circuit, such as an unplugged connector, a broken wire or an internally open sensor.

Related codes: P0180P0181P0182P0184P0193

Symptoms4

• Check engine light on.
• Implausibly low fuel temperature on the scan tool.
• Slightly hard hot starting on some vehicles.
• Sometimes no clear symptoms.

Possible causes5

• Unplugged or loose connector.
• Broken signal or ground wire.
• Open circuit inside the fuel temperature sensor.
• Corroded terminals causing very high resistance.
• Signal wire shorted to a voltage source (less common).

How to diagnose4

1. Watch the reading on a scan tool; a very low, unchanging reading confirms the high voltage.
2. Check the connector is fully seated.
3. Place a temporary jumper between the signal and ground terminals on the harness side; if the reading jumps to very hot, the wiring is good and the sensor is open.
4. If the reading does not change, check wiring continuity to the computer using the manufacturer wiring diagram.

How to fix4

1. Reconnect the connector or clean its terminals.
2. Repair the broken wire.
3. Replace the fuel temperature sensor if its internal circuit is open.
4. Clear the codes and confirm the reading makes sense.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

Reconnecting a connector or repairing a wire is cheap; the upper end is for replacing the sensor or the part it is built into.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions