GMC Troubleshooting Questions? Ask a Mechanic for Answers
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does the security light stay on with the ignition on?
does it come on at all?
is the fuel pump coming on?
ok,,the fuel pump will only come on for two seconds when you first turn on the key
then it is suppose to run all the time that the engine is turning
i dont think it is a security issue sense the security light doesnt stay on
tell me,how did the problem first begin?
ok..i think you may have a bad fuel pump,,sense you also get the fuel pump code
i think it is only working at random
another thing that may cause a similer problem is the crank sensor..the crnk sensor can do this and not give a code for it
1 - Ignition Coil 8 2 - Ignition Coil 6 3 - Ignition Coil 4 4 - Manifold Absolute Pressure (MAP) Sensor 5 - Throttle Body 6 - Ignition Coil 2 7 - Knock Sensor (KS) - 2 8 - Crankshaft Position (CKP) Sensor 9 - Oil Level Switch 10 - Starter 11 - Valve Lifter Oil Manifold (VLOM) Assembly (LY5/LMG/L76/LC9) 12 - Engine Oil Pressure (EOP) Sensor