Engine Oil Pressure Gauge Inaccurate or Inoperative

Engine Oil Pressure Gauge Inaccurate or Inoperative

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Diagnostic System Check - Vehicle) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Strategy Based Diagnosis) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Diagnostic Procedure Instructions) provides an overview of each diagnostic category.

Circuit/System Description

The auxiliary gauge module displays the engine oil pressure based on the information from the engine control module (ECM). The ECM converts the data from the engine oil pressure sensor to a engine oil pressure signal. The ECM sends the engine oil pressure signal via a High Speed CAN-Bus signal to the body control module (BCM). The BCM then sends the information via a Low Speed CAN-Bus signal to the auxiliary gauge module to display the engine oil pressure.

Reference Information
Schematic Reference

Instrument Cluster Schematics (Instrument Cluster Schematics)
Connector End View Reference

Component Connector End Views (Connector Views)
Description and Operation

Auxiliary Gauges Description and Operation (Auxiliary Gauges Description and Operation)
Electrical Information Reference

* Circuit Testing (Circuit Testing)
* Connector Repairs (Connector Repairs)
* Testing for Intermittent Conditions and Poor Connections (Testing for Intermittent Conditions and Poor Connections)
* Wiring Repairs (Wiring Repairs)

Scan Tool Reference

Control Module References (Programming and Relearning) for scan tool information

Circuit/System Verification

1. Ignition ON, perform the Auxiliary Gauge Sweep test with the scan tool, verify that the engine oil pressure gauge sweeps from its low to high position.

• If the engine oil pressure gauge does not sweep, replace the P26 Auxiliary Gauge Module.

2. If the engine oil pressure gauge does sweep, replace the K20 Engine Control Module.

Repair Instructions

Perform the Diagnostic Repair Verification (Verification Tests) after completing the diagnostic procedure.

Control Module References (Programming and Relearning) for Auxiliary Gauge Module or ECM replacement, setup, and programming