What causes GM code 25?

Shorted MAT or intake air temp sensor Signal wire shorted to ground Failed sensor reading far hotter than actual air Heat soaked wiring melted against exhaust parts

How do I fix GM code 25?

Compare scan tool air temp to actual ambient temperature Unplug the sensor and check whether the reading swings cold Inspect wiring for melted insulation near hot parts Measure sensor resistance against the factory temperature chart Replace the sensor only after a wiring short is ruled out

25 Intake Air Temp Sensor Error High Temp Indicated

Q: What does GM code 25 mean?

GM code 25. Intake Air Temp Sensor Error High Temp Indicated. Applies to 1986-1995 GM cars and C/K trucks, Camaro, Corvette.

Make: GM (1982-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: 1986-1995 GM cars and C/K trucks, Camaro, Corvette

How to read it

Code 25 reads as 2 flashes, pause, 5 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 25 mean?

25. Intake Air Temp Sensor Error High Temp Indicated. This code sets when your vehicle computer detects intake air temp sensor error high temp indicated.

Common causes of 25

Shorted MAT or intake air temp sensor
Signal wire shorted to ground
Failed sensor reading far hotter than actual air
Heat soaked wiring melted against exhaust parts

How to fix 25

Compare scan tool air temp to actual ambient temperature
Unplug the sensor and check whether the reading swings cold
Inspect wiring for melted insulation near hot parts
Measure sensor resistance against the factory temperature chart
Replace the sensor only after a wiring short is ruled out