AutoCodes – GMC – P1183 GMC

P1183 GMC Code - Supercharger Inlet Pressure Sensor Circuit Low Voltage

Quick Answer

The Supercharger Inlet Pressure (SCIP) Sensor measures both the atmospheric pressure and the vacuum that exists, under different operating conditions, in the supercharger intake plenum. Common causes include Faulty Supercharger Inlet Pressure (SCIP) Sensor, Supercharger Inlet Pressure (SCIP) Sensor harness open or shorted, Supercharger Inlet Pressure (SCIP) Sensor circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P1183 GMC indicates Supercharger Inlet Pressure Sensor Circuit Low Voltage.
Common causes: Common causes include Faulty Supercharger Inlet Pressure (SCIP) Sensor, Supercharger Inlet Pressure (SCIP) Sensor harness open or shorted, Supercharger Inlet Pressure (SCIP) Sensor circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 1,640

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1183 GMC Description

The Supercharger Inlet Pressure (SCIP) Sensor measures both the atmospheric pressure and the vacuum that exists, under different operating conditions, in the supercharger intake plenum. The plenum volume between the throttle body and the supercharger is where this sensor is located, and for the purpose of this diagnostic, this area is considered to be the intake manifold. The SCIP sensor has the following types of circuits:
- A Powertrain Control Module (PCM) supplied and regulated 5-volt reference circuit
- A PCM supplied ground for the low reference circuit
- A sensor signal circuit that supplies a voltage input to the PCM
The diaphragm within the SCIP sensor responds to the pressure changes in the intake manifold, and provides a signal voltage to the PCM on the signal circuit, relative to those pressure changes.
The PCM monitors the SCIP sensor signal for voltage that is outside of the normal range of a properly operating sensor. If the PCM detects a SCIP sensor signal voltage that is excessively low, DTC P1183 sets.

OBDII Code P1183 GMC - Supercharger Inlet Pressure Sensor Circuit Low Voltage - AutoCodes.com — P1183 GMC Code - Supercharger Inlet Pressure Sensor Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1183 GMC?

Faulty Supercharger Inlet Pressure (SCIP) Sensor
Supercharger Inlet Pressure (SCIP) Sensor harness open or shorted
Supercharger Inlet Pressure (SCIP) Sensor circuit poor electrical connection
Faulty Powertrain Control Module (PCM)

How to Fix the DTC P1183 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1183 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.