2003 chevy trailblazer tach inop
The tachometer in your truck is controlled by the Instrument Panel Cluster (IPC) module, which recieves engine speed information from the Powertrain Control Module (PCM) via the digital communications network in your truck.
There may be an engine control problem that is causing your engine to run rough and cause your tachometer to not operate as well. However, there is no way that the tachometer itself is going to make the engine run poorly. The tachometer has no fuse of its own that does not also affect several other electrical circuits in your truck. Looking for the fuse as a possible fix for your problem is totally useless.
What you need to do is to scan your onboard computer network, incluuding the PCM, BCM, IPC and the ABS modules to see where the problem is located. It may even be a communications network error. There is no way of knowing for sure without establishing communications with the network and interfacing with all of the control modules that use the tachometer signal to perform certain functions.
PLEASE NOTE: Generic OBD code readers CANNOT perform the functions that will be needed to diagnose and repair this problem.
May 06, 2012 |
Cars & Trucks