Question about Pontiac Grand Am
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Posted on Jan 02, 2017
Has the battery been disconnected or been low on charge in the last 50 ignition cycles?
Code 12 means that battery power has been disconnected within the last 50 ignition cycles. it does not mean there is no battery power to the computer
Pin 3 should be a red/white wire that is the constat power supply to the PCM. It is protected by a fusible link located neer the drivers side strut tower. If that link was bad the car would not start or run as it also supplieds power to the asd relay, fuel pump relay, and the ssd relay.
I would put money on the the problem being igntion (plugs wires cap rotor), compression (low cylinder compression usually cylinders 2 and 3), lack of fuel delivery (low fuel pressure, a weak or dirty injector), timin (timing belt jumped, worn distributor, look exciter ring), or possibly a plugged catalytic converter.
I would check compression first especially cylinders 2 and 3. It was pretty common for the head gasket to fail in between these two cylinders.
Posted on Feb 24, 2012
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