When the 2022 GMC Terrain sets P0183, the Fuel Temperature Sensor A is sending higher voltage than expected. This indicates low resistance, interpreted as extremely high fuel temperature—likely a sensor or circuit fault rather than actual hot fuel.
Understanding P0183
P0183 indicates fuel temperature sensor voltage exceeds normal thresholds. High voltage means low resistance in the thermistor, corresponding to very hot temperatures. If voltage is abnormally high, the ECU thinks fuel is extremely hot, which would cause lean fueling if accepted as accurate.
Terrain Engine and Fuel System
The 2022 Terrain uses a 1.5L turbocharged four-cylinder. This direct injection engine requires precise fuel density calculations. The fuel temperature sensor helps compensate for density changes with temperature, though the ECU has safeguards against unrealistic readings.
Common Causes of P0183
A shorted fuel temperature sensor outputs high voltage (low resistance). Internal sensor failure can short the thermistor element, indicating extreme heat.
Wiring shorts that connect the signal to voltage source cause high readings regardless of actual temperature.
Water intrusion in the connector can create a low-resistance path, causing high voltage readings.
Diagnostic Approach
Monitor fuel temperature readings on a cold start—if showing extreme heat (200°F+), suspect a fault. Disconnect the sensor; voltage should drop significantly. If it stays high, there's a wiring short. If voltage drops, the sensor is shorted internally. Test sensor resistance at known temperature.