20 Most Recent 1998 GMC Sierra - Page 3 Questions & Answers

Sounds to me its time to replace your ecm

You have a short in the wiper system

Details needed. When not working does blower motor run? Does compressor run? Do you get hot air instead of cold? When it works what is different?

have you tried servicing your gearbox ,check your oil level

See u-tube under bad auto ground. Test with volt meter. Locate cables from ground side of battery to body, take off and clean.

In the liquid line...........Located @ the condenser end or the Accum/Drier end. If you need further help, reach me via phone at https://www.6ya.com/expert/ralph_2f0886b7d6af32ce

Annette: According to http://www.realworldautomotive.com/shoptalk-questions-1999-chevy-tahoe-security-light-on-dash-t467.html : " Passlock is a second generation General Motors' theft deterrent system. With the use of a Passlock sensor (mounted in the steering column) the Passlock system can determine improper ignition key and lock cylinder operation by monitoring magnetic fields emitted by the lock cylinder assembly. Once improper operation is confirmed, engine startup is disabled. The Passlock system eliminated the resistor chip mounted in the ignition key used by the previous Passkey system, including the headaches and expense that went along with it. Passlock is a subsystem of the vehicle's Powertrain Control Module. The Passlock sensor sends a signal to the Passlock control module. The Passlock module reads this signal and sends the appropriate information to the Powertrain Control Module. If the ignition key and lock cylinder operates normally the engine will start as usual. If it was operated improperly the Powertrain Control Module will be directed to disable fuel injector operation, prevent engine startup, and there will be a diagnostic trouble code set in the Passlock Control Module's memory. I just wanted to give you an understanding of system operation. It's gonna require the correct scan tool for proper diagnosis. Weak links are the circuits to and from the Passlock Sensor in the steering column. It's a very sensitive signal and can be easily affected by shoddy electrical connections. If a scan tool displays diagnostic trouble code B2960 (Passlock sensor voltage out of range), the next step would be a resistance check and a complete inspection of connections and wiring involving the sensor. Pay the diagnostic time at a heads-up auto repair shop."

Bad relay or switch If you need further help, I’m available over the phone at https://www.6ya.com/expert/david_4c166ba81493f541

Can vary 16 to 20 gal

Tune up time. Not pulling enough air, air filter, not pushing enough, catalytic converter. Fuel filter? Could be valves, rings. Do a compression test. Open up the exhaust system first. A bad converter will mess it the compression up. No air in, No air out.

RELEASE PRESSURE ON HOSE CHECK FLUID IN SYSTEM ,CHECK POWER AT SWITCH

The problem has to be fixed to reset the light. A scanner can do this. If the problem was fixed, then about 50 key on and off's will turn the light off.

you may try reving engine alittle higher try shifting to fourth if that works your third gear sincroniser is shot

bad sensor

waterpump has died or is by the sounds of it

the front will work, the back you can determine by counting the number of bolts holding the rear diff cover if both are the same you are good to go

isn't there a fuse panel under the hood, left side over the front wheel?

should be near the tail shaft of the trans. on driver's side

first check for broken vacuum lines under the hood that go to the inside of the truck could be as simple as that