20 Most Recent 2004 GMC Sierra Denali - Page 6 Questions & Answers

This is caused by a problem in the Body Control Module, have it tested for trouble codes.

its coolent temp sensor for the radiator fan check it if not that a bad radiator fan relay.

May need.heater core flushed out.

if the battery dies that fast it may be time for a new battery.have your existing battery load tested to see if it is any good.

In the fuel tank

The Traction Control is part of the ABS system. This sound like a possible speed sensor harness problem (pretty common on GMC vehicles). There are two wire harness that plug into each front wheel speed sensors and sometimes, when turn the wheel these harnesses flex with wheel movement, thus causing a erratic speed signal to the computer which in turns causes the light to come on, because the computer thinks one wheel is spinning.

Keep in mind that the only way to know for sure is to have the ABS scanned for codes, so, what needs to be done from here is to have the fault codes checked in the ABS/Traction computer to see if any are set, any shop or dealer can do this and a local parts store might check fault codes for you free of charge as I have hard of before.

Then it can be diagnosed as to what is at fault and then repaired. If no codes are set then the vehicle needs driven with the scan tool plugged into the vehicle to observe the wheel speed sensor signals, if a wheel speed sensor signal is found not reading close to the other wheel speed sensor signals then this is the suspect sensor and the connections need checked at the sensor as well as the wiring to make sure it is OK.

Most of the time it ends up being a faulty wheel speed sensor and needs replaced.

Hope this helps.

u may need 2 replace the timing gears as well old gears may have worn teeth.i had same prblem with a chev mtr fitted a chain&gear set fixed it right up. ps make sure u use a new chain

Look for a blower relay, if there is no relay then the blower switch/resistor is bad.

Do you mean that the engine shuts off when you come to a stop? If so, you need to have the throttle body cleaned, grime build up in the throttle body will cause a lean condition. This shutting off happens especially with the AC on.

sounds like a weak oil pump or better yet a bad oil sending unit

year/make/model and security system installed??? Usually you can just disconnect a fuse or security wire but depends on year/

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What is the GMC year, model and engine sizes (cyl number).