Low Engine Coolant Indicator Always On

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Yukon, 2002 Chevrolet Tahoe, 2002 Chevrolet Suburban, and 2002 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Step	Action	Yes	No
Connector End View Reference: Cooling System Connector End Views
1	Did you perform the Engine Cooling Diagnostic System Check?	Go to Step 2	Go to
2	Verify that the engine coolant is at the proper level. Turn ON the ignition, with the engine OFF. Does the IPC display Low Engine Coolant?	Go to Step 3	Go to TESTING FOR INTERMITTENT AND POOR CONNECTIONS
3	Install a scan tool. With a scan tool, view the Coolant Level Switch data in the Engine Data 2 data list. Does the scan tool display Low?	Go to Step 4	Go to Step 7
4	Disconnect the coolant level sensor electrical connector. Connect a 3-amp fused jumper between the coolant level switch signal circuit of the coolant level sensor electrical connector and the ground circuit of the coolant level sensor electrical connector. With a scan tool, view the Coolant Level Switch data in the Engine Data 2 data list. Does the scan tool display OK?	Go to Step 8	Go to Step 5
5	Connect a 3-amp fused jumper between the coolant level switch signal circuit of the coolant level sensor electrical connector and a good ground. With a scan tool, view the Coolant Level Switch data in the Engine Data 2 data list. Does the scan tool display OK?	Go to Step 10	Go to Step 6
6	Inspect the coolant level signal circuit for an open or short. Refer to CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	Go to Step 14	Go to Step 9
7	Inspect for poor connections at the harness connector of the IPC. CIRCUIT TESTING and WIRING REPAIRS . Did you find and correct the condition?	Go to Step 14	Go to Step 11
8	Inspect for poor connections at the harness connector of the coolant level sensor. TESTING FOR INTERMITTENT AND POOR CONNECTIONS . Did you find and correct the condition?	Go to Step 14	Go to Step 12
9	Inspect for poor connections at the harness connector of the PCM. Refer to TESTING FOR INTERMITTENT AND POOR CONNECTIONS . Did you find and correct the condition?	Go to Step 14	Go to Step 13
10	Repair the open in the ground circuit of the coolant level sensor. Refer to WIRING REPAIRS . Did you Complete the repair?	Go to Step 14	-
11	Replace the IPC. Refer to INSTRUMENT PANEL CLUSTER (IPC) REPLACEMENT . Did you Complete the repair?	Go to Step 14	-
12	Replace the coolant level sensor. Did you Complete the repair?	Go to Step 14	-
13	Replace the PCM. Refer to POWERTRAIN CONTROL MODULE . Did you Complete the repair?	Go to Step 14	-
14	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 3