Questions & Answers for: GMC Sierra pcm

...GMC Sierra 1500 4.3L V-6 with a O2 sensor problem. I replaced it with a new one and cleared the ECM/PCM by disconnecting the battery cable (-). I tested it again using the ALDL and all looks good. I ...

how do you reset the computer on a 98 gmc sierra One way is to remove any fuses that say ECM/PCM in the fuse block and let them out for 20 minutes or more and another way is to disconnect the negitive

...any suggestions? Transmission does not shift automatically, only manually. Swap in a known-good PCM, check wiring, check other sensors such as VSS and TPS. Trans shifts into gear harshly, car ...

...mode" ? This is a fault mode in which the transmission either loses electrical power or the PCM deactivates all of the electronics. The transmission will default to max line pressure. The ...

fuel injectors don't spray at all. PROBLEM COULD BE FUEL INJECTORS FUSE BLOWED OR BAD PCM.HAVE IT SCAN TO LOOK OUT FOR ECM OR PCM FAULTS.

...check the fluid level (car warmed up, engine running in Park on level ground) and have the PCM scanned for trouble codes FIRST. This guide is meant for problems that do not show up as PCM ...

...a no start problem. I'm getting a code PO339 for crank sensor intermittent problem. I suspect the PCM to be the problem. I'm using a Hanes manual to troubleshoot and the electrical schematics is of ...

.... You vehicle use's a VSS vehicle speed sensor on the transmission . This VSS is a input to the PCM- engine computer . The PCM sends this info. in a message over the class 2 serial data bus, a ...

why doesn't a pcm code flash when I run diagnostic for a check brake light on my 94 gmc sierra The ABS light will record a dtc, but not the brake warning light, which usually measures pressure ...

#6 coil on 01 sierra 5.3 not firing replaced wiring from pcm to the coil, coil is good plug wire is good tried different pcm still nothing on #6 any suggestions Hello, check the compression on all ...