Battery Cable problems of the 2004 Chevrolet Trailblazer

Had p0128 code for about 1 year. Replaced thermostat after p1680 code, reduced engine power light came on. Reduced engine power light went away on next crank up to move vehicle and change thermostat. Abs and brake lights both on intermittently. Tachometer has been sticking and speedometer showed erratic signs around 55 mph. Now all gauges going wacko or not working at all at times. Temperature gauge wrapped completely around without even starting cold engine. About a mile later, instrument panel lit completely up then went away, gauges reset, and ran fine with properly operating instrument panel. . . At least until I got home. Then wacko stuff again. Reset pcm by disconnecting battery cable, now things seem fine. . . For now. I'm told to redo bad ground on ecbm before suspecting bad abs module and to replace ignition switch before suspecting bad instrument cluster and pcm. However, dealer analysis said abs module got moisture in it and the instrument panel needs to be replace. First is a $1000 abs module, second is a $400 panel, both have labor charges additional.

I began having problems with speedometer and tachometer several years ago. The tac and speedometer go haywire and then go dead while driving down the road. I brought it in and was told that it was a faulty gauge cluster that needed to be replaced and that it was a problem already recalled in other gm vehicles. The service tech was able to unhook the battery cable and reset the gauges but they still aren't fixed. I have been reading multitudes of complaints of the same thing.

The contact owns a 2004 Chevrolet Trailblazer. While the contact was driving approximately 65 mph, suddenly the speedometer displayed an inaccurate reading. The reading would fluctuate intermittently at any given speed. The contact stated the failure could be corrected by turning the engine off and restarting; and disabling the battery cable. The failure progressed. The vehicle had not been diagnosed or repaired at the time of the complaint. The failure mileage was 60,000.

I began having problems with speedometer and tachometer several months ago. The tac and speedometer go crazy and then go dead while driving down the road. I took it in and was told that it was a faulty gauge cluster that needed to be replaced and that it was a problem already recalled in other gm vehicles. The service tech was able to unhook the battery cable and reset the gauges but they still aren't fixed. I have been reading multitudes of complaints of the same thing. My Trailblazer started doing this around 51,000 miles!.