Possible Causes

PCM
Instrument cluster

CHECK FUEL CAP WARNING INDICATOR IS NEVER ON - PINPOINT TEST REFERENCE

PINPOINT TEST 9		CHECK FUEL CAP WARNING INDICATOR IS NEVER ON
STEP	INSPECTION		ACTION
1	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PCM SELF-TESTS Retrieve the recorded DTCs from the PCM continuous and on-demand self-tests. Are any DTCs retrieved?	Yes	See DIAGNOSTIC TROUBLE CODE (DTC) INDEX - POWERTRAIN CONTROL MODULE (PCM) , .
1		No	Go to next step.
2	RETRIEVE THE RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND INSTRUMENT CLUSTER SELF-TESTS Retrieve the recorded DTCs from the instrument cluster continuous and on-demand self-tests. Is DTC U0294 retrieved?	Yes	CLEAR the DTCs. REPEAT the self-test. If DTC U0294 is retrieved again, go to step 4. For all other instrument cluster DTCs, See INSTRUMENT CLUSTER DIAGNOSTIC TROUBLE CODE (DTC) INDEX , .
2		No	Go to next step.
3	CARRY OUT THE INSTRUMENT CLUSTER INDICATOR LAMP COMMAND USING THE SCAN TOOL Key ON engine OFF (KOEO). Enter the following diagnostic mode on the scan tool: Instrument Cluster Active Command Select the indicator lamp active command. Select the check cap active command on then off. Observe the check fuel cap indicator. Does the check fuel cap indicator turn on when commanded on and turn off when commanded off?	Yes	Go to next step.
3		No	Go to step 5.
4	CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	Install a new PCM. See POWERTRAIN CONTROL MODULE (PCM) REMOVAL / INSTALLATION , . Test the system for normal operation.
4		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.
5	CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect all the instrument cluster connectors. Check for: corrosion damaged pins pushed-out pins Connect all the instrument cluster connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present?	Yes	Install a new instrument cluster. see INSTRUMENT CLUSTER . Test the system for normal operation.
5		No	The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector.