Engine Oil Pressure Indicator Always On. Pontiac Montana

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 2005 🢒 Montana - 4WD 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Engine Oil Pressure Indicator Always On

Step	Action	Yes	No
Schematic Reference: Instrument Cluster Schematics
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
2	Start the engine. Does the engine oil pressure indicator illuminate after the displays test?	Go to Step 3	Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems
3	Install a scan tool. Turn the ignition ON. With the scan tool, observe the Engine Oil Pressure parameter in the PCM IPC data list. Does the Engine Oil Pressure parameter display Ok?	Go to Step 10	Go to Step 4
4	Turn the ignition OFF. Disconnect the engine oil pressure switch. Start the engine. With the scan tool, observe the Engine Oil Pressure parameter. Does the Engine Oil Pressure parameter display Ok?	Go to Step 6	Go to Step 5
5	Test the signal circuit of the engine oil pressure switch for a short to ground. Refer to Circuit Testing and to Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 7
6	Inspect for poor connections at the harness connector of the engine oil pressure switch. Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 8
7	Inspect for poor connections at the harness connector of the powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and to Connector Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 11	Go to Step 9
8	Replace the engine oil pressure switch. Refer to Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical. Did you complete the replacement?	Go to Step 11	--
9	Replace the PCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	Go to Step 11	--
10	Replace the instrument panel cluster (IPC). Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement?	Go to Step 11	--
11	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2