What Does P1160 Mean?
This code indicates the Intake Air Temperature (IAT) sensor circuit has a short to ground. The IAT sensor is a negative temperature coefficient (NTC) thermistor that provides intake air temperature data to the PCM for fuel mixture and ignition timing corrections. A short to ground forces the signal voltage near 0V, which the PCM interprets as extremely high air temperature, causing incorrect fuel trim adjustments and potential detonation issues.
Common Causes
30%
IAT sensor signal wire shorted to ground due to chafed insulation
25%
Failed IAT sensor with internal short circuit
20%
Water intrusion or corrosion in the IAT sensor connector causing a short
15%
Pinched wiring harness near the intake manifold or airbox
10%
Damaged PCM connector pin allowing signal to contact ground
Diagnostic Steps
1
Read the IAT sensor value in live data; a reading of 280-300°F (140-150°C) with a cold engine confirms the PCM sees a shorted signal.
2
Disconnect the IAT sensor connector and check if the scan tool reading changes to a very low temperature (-40°F); this confirms the short is in the sensor itself.
3
If the reading stays high with the sensor disconnected, use an ohmmeter to check for a short to ground on the signal wire between the connector and the PCM.
4
Inspect the IAT sensor connector and wiring harness for damage, water intrusion, or contact with hot exhaust components.
5
Replace the IAT sensor if it shows near-zero resistance at room temperature (should be approximately 2,000-3,000 ohms at 68°F/20°C).
Estimated Repair Cost
$50 - $200
Parts + labor, varies by vehicle and location
This code indicates the Intake Air Temperature (IAT) sensor circuit has a short to ground. The IAT sensor is a negative temperature coefficient (NTC) thermistor that provides intake air temperature data to the PCM for fuel mixture and ignition timing corrections. A short to ground forces the signal ...
The most common cause of P1160 (Intake Air Temperature Sensor Short To Ground) is: IAT sensor signal wire shorted to ground due to chafed insulation
Typical repair costs for P1160 range from $50 to $200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The PCM may over-lean the fuel mixture thinking the air is very hot, which can cause engine knock/detonation under load. Prolonged detonation can damage pistons and bearings. The vehicle should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1160 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel / Air Metering
Difficulty
Type
Manufacturer
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