[HotZ28]

Intermittent problems like this, are very difficult to diagnose. Since you have replaced the ICM & CKPS several times, evidentially you have a wiring problem somewhere between the CKPS, ICM and the PCM. I assume that you have cleaned and tightened the battery cables. If so, double check the wiring & terminal connection @ the ICM. From there, check and clean the ground terminals mounted on the right front fender.


Also, be sure the grounds are clean & tight under the ICM. From there, check the wires routed under the alternator going to the PCM for fraying, or damage. You will need to remove the alternator to access the wiring harness. Pull all the wiring out of the shielding for inspection. Remember, all it takes is one bad wire in a circuit to cause a problem. When working on anything electrical, remember to always disconnect the negative (-) battery terminal first!! Another word of caution, if you have auto climate control, be sure to turn the system OFF with ignition switch ON, before disconnecting the battery!