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Low Engine Coolant Indicator Always On

WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
Low Engine Coolant Indicator Always On

Step Action Yes No
1 Did you perform the Diagnostic System Check - Vehicle? Go to Step 2  Go to Diagnostic System Check - Vehicle
2
  1. Verify that the engine coolant is at the proper level.
  2. Turn ON the ignition, with the engine OFF.
Does the instrument panel cluster (IPC) display Low Engine Coolant?		 Go to Step 3  Go to Testing for Intermittent Conditions and Poor Connections
3
  1. Install a scan tool.
  2. 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
  1. Disconnect the coolant level sensor electrical connector.
  2. 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.
  3. 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
  1. Connect a 3-amp fused jumper between the coolant level switch signal circuit of the coolant level sensor electrical connector and a good ground.
  2. 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. Refer to Testing for Intermittent Conditions and Poor Connections and Connector 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. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
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 powertrain control module (PCM). Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
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 Control Module References for replacement, setup, and programming.
Did you complete the repair?		 Go to Step 14  -
12 Replace the surge tank. Refer to Surge Tank Replacement .
Did you complete the repair?		 Go to Step 14  -
13 Replace the PCM. Refer to Control Module References for replacement, setup, and programming.
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 
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