What Does P1162 Mean?
This code is a secondary or alternate definition for an Intake Air Temperature sensor short to ground, similar to P1160 but may apply to a secondary IAT sensor location (e.g., post-intercooler on turbocharged applications or a second measurement point in the intake tract). The signal voltage is pulled to near 0V, causing the PCM to calculate incorrect air density and adjust fueling inappropriately for the actual conditions.
Common Causes
30%
IAT sensor signal wire shorted to ground from physical damage
25%
Failed IAT sensor with internal short to ground
20%
Moisture ingress at the sensor connector creating a ground path
15%
Wiring harness routing too close to engine ground points or hot components
10%
Aftermarket air filter or intake modification pinching or exposing sensor wiring
Diagnostic Steps
1
Verify the IAT sensor reading in live data shows an unrealistically high temperature (e.g., 250°F+) with the engine cold, confirming a short-to-ground condition.
2
Disconnect the sensor and check if the reading swings to -40°F (open circuit default); if so, the short is internal to the sensor.
3
If the reading remains high with the sensor disconnected, perform a wire-by-wire check for shorts to ground using an ohmmeter on the signal wire.
4
Inspect the sensor connector for water, corrosion, or contamination; clean and apply dielectric grease.
5
Replace the IAT sensor if internal resistance is near zero ohms at room temperature.
Estimated Repair Cost
$50 - $200
Parts + labor, varies by vehicle and location
This code is a secondary or alternate definition for an Intake Air Temperature sensor short to ground, similar to P1160 but may apply to a secondary IAT sensor location (e.g., post-intercooler on turbocharged applications or a second measurement point in the intake tract). The signal voltage is pull...
The most common cause of P1162 (Intake Air Temperature Sensor Short To Ground) is: IAT sensor signal wire shorted to ground from physical damage
Typical repair costs for P1162 range from $50 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Similar to P1160, the PCM may lean out the fuel mixture excessively, potentially causing detonation under heavy load. The vehicle should be diagnosed and repaired promptly to prevent potential engine damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1162 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering
Difficulty
Type
Manufacturer
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