GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 2005 🢒 Kodiak C-Series Motorhome (Cutaway) C4/C5 🢒 Vehicle Control Systems 🢒 Vehicle DTC Information 🢒 Low Engine Oil Level Indicator Always On

Step

Action

Yes

No

Schematic Reference: Instrument Cluster Schematics

Connector End View Reference: Master Electrical Component List in Wiring Systems

1

Did you perform the Diagnostic System Check - Vehicle?

Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn the ignition ON, with the engine OFF.
  3. With a scan tool, observe one of the following Engine Oil Level Switch parameters:
    4. • Engine Oil Level Switch in the engine control module (ECM) Engine Data 1 data list (LLY and LG4)
    • Engine Oil Level Switch in the powertrain control module (PCM) Engine Data 2 data list (L18)

Does the Engine Oil Level Switch parameter display OK?

Go to Step 3

Go to Step 4

3

Does the low engine oil level indicator remain illuminated after the displays test?

Go to Step 11

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

4
  1. Turn the ignition OFF.
  2. Disconnect the engine oil level switch.
  3. Connect a fused jumper between the signal circuit of the engine oil level switch and a good ground.
  4. Turn the ignition ON, with the engine OFF.
  5. With the scan tool, observe the Engine Oil Level Switch parameter.

Does the Engine Oil Level Switch parameter display OK?

Go to Step 6

Go to Step 5

5

Test the signal circuit of the engine oil level switch for a short to battery voltage, an open, or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 8

6

Test the ground circuit of the engine oil level switch for an open or a high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 7

7

Inspect for poor connections at the harness connector of the engine oil level switch. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 9

8

Inspect for poor connections at the harness connector of the PCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 12

Go to Step 10

9

Replace the engine oil level switch. Refer to one of the following procedures:

    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 6.6L (LLY)
    •  in Engine Mechanical - 7.8L (LG4)
    •  Engine Oil Pressure Sensor and/or Switch Replacement in Engine Mechanical - 8.1L

Did you complete the replacement?

Go to Step 12

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10

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 12

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11

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 12

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12

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 2