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1999 Chevrolet Tahoe Failed Trouble Code P1345

My vehicle, 1999 Chevrolet Tahoe failed the smog test recently due to the check engine light being on and trouble code P1345 in the computer. All other tests were OK. Any suggestions on what to do next to pass the smog test? Thanks.

Answer:

Trouble Code P1345 relates to your Chevy Tahoe's camshaft and crankshaft positions. P1345 indicates the camshaft and crankshaft timing is not in sync. In fact a mechanical timing fault can exist due to a faulty Cam Phaser Actuator sprocket, or the fault could be a defective sensor; camshaft position sensor or crankshaft position sensor. To check whether your Chevy Tahoe camshaft and crankshaft timing is on time you'll need to inspect the timing alignment marks on the engine. With the camshaft cover removed and the #1 cylinder at top dead center, make sure that the dark chain links are lined up with the alignment marks on the exhaust and intake cam sprockets. This inspection is recommend to be performed by a trained technician. The Crankshaft Position (CKP) sensor is a magnet generator. It is used by the power control module (PCM) to signal engine rpm. The CKP sensor is connected to the powertrain control module (PCM) by a 12-volt, signal circuit and a low reference circuit. The Camshaft Position (CMP) sensor is also a magnet generator. The CMP sensor provides 6 signal pulses every camshaft revolution. The CMP sensor signal and crankshaft position (CKP) signal enable the PCM to monitor engine rotation and camshaft rotation. The relationship between both shafts is used for correct sequential fuel injection. Similair to the CKP, the CMP sensor is connected to the PCM by a 12-volt, low reference, and signal circuit. posted by SmogTips Support

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