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OBD-II Trouble Shooting Got a code reader? Find out what your GM car's Check Engine light is trying to tell you (and then turn Check Engine light off).

 
 
 
 
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Old 09-24-2009, 04:38 PM   #1
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Default P0112

P0112

Description
IAT SENSOR CIRCUIT LOW VOLTAGE

Intake Air Temperature (IAT) sensor is a thermistor that
varies resistance based on temperature. As temperature of sensor
increases, resistance decreases. High temperature will result in a low
signal voltage. DTC will set when PCM sees an IAT sensor voltage of
less than 0.82 volt for 10 seconds after engine runs for 100 seconds.

Symptoms
SES Service Engine Soon light

Causes
  • Defective IAT sensor
  • Loose or corroded connection at IAT sensor
  • Open in IAT ground circuit or signal circuit
  • Short to voltage in IAT signal circuit or reference circuit
  • IAT harness and/or wiring routed too close to high-voltage wiring such as alternator, spark plug cables, etc.
Possible Solutions
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obd2, obdii, p0112, p112

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