P1183 GMC Possible Causes
- Faulty Compressor Inlet Pressure Sensor (SCIP)
- Compressor Inlet Pressure Sensor (SCIP) Harness Open or Shorted
- Compressor Inlet Pressure Sensor (SCIP) Circuit Poor Electrical Connection
- Faulty Powertrain Control Module (PCM)
How is GMC Code P1183 Repaired?
Start by checking the “Possible Causes” listed above. Visually inspect the corresponding wiring harness and connectors. Look for damaged components and check for broken, bent, pushed out, or corroded connector pins.
Possible Symptoms
- Engine Light On (or Service Engine Soon Warning Light)
P1183 GMC Meaning
The Compressor Inlet Pressure Sensor (SCIP) measures both atmospheric pressure and the vacuum that exists, under different operating conditions, in the compressor intake plenum. The volume of the plenum between the throttle body and the compressor is where this sensor is located, and for the purposes of this diagnostic, this area is considered the intake manifold. The SCIP sensor has the following circuit types:
– A 5-volt reference circuit supplied and regulated by the Powertrain Control Module (PCM)
– A ground provided by the PCM for the low reference circuit
– A sensor signal circuit that provides a voltage input to the PCM
The diaphragm inside the SCIP sensor responds to pressure changes in the intake manifold and provides a signal voltage to the PCM on the signal circuit, relative to these pressure changes.
The PCM monitors the SCIP sensor signal for a voltage that is outside the normal range of a properly functioning sensor. If the PCM detects an excessively low signal voltage from the SCIP sensor, DTC P1183 is set.