20 Most Recent 2005 GMC Sierra 2500HD 4WD - Page 3 Questions & Answers

Check 'U' joints on drive shaft.

YEA, REPLACE EGR VALVE, ALSO, REPLACE AIR & FUEL FILTER, OXYGEN SENSOR SHOULD ALSO BE REPLACED !!!!! DON'T KNOW WHAT YOUR CODES ARE @ THIS TIME, BUT TAKE TO A AUTOPARTS STORE, THEY CAN PULL THEM & LET YOU KNOW ! MISFIRE MAY BE YOUR KNOCK SENSOR, ACTING LIKE A MISFIRE . EGR VALVE IS KNOWN TO GET CLOGGED UP, SEVERELY ! MAP SENSOR MAY BE ACTING UP ALSO, ALL SENSORS WORK TOGETHER, IF ONE STARTS GOING BAD THE OTHERS TRY TO ALONG WITH THE COMPUTER TRY TO COMPENSATE, YOU ONLY NOTICED IT AFTER FREEWAY, BECAUSE @ HIGHER THROTTLE, IT WILL NOT SHOW UP, THE TRUTH CAME OUT WHEN YOU GOT OFF THE FREEWAY ! VERY CONDISENDING , ESPECIALLY WHEN YOU THOUGHT YOU WHERE HELPING TO BLOW OUT THE ENGINE TO RUN BETTER,. YOU SHOOK SOMETHING LOOSE. BETTER AFTER FREEWAY, THEN ON IT.

P0101 Mass or Volume Air Flow Circuit Range/Performance Problem, hope it can help you!_________digiprog 3 car list

Thats it ,oh and a hammer to knock it out of the knuckle.Some guys tighten the axle nut back up with a torque wrench.

replace the lock cylinder, one of the pins has jammed.

Did you check the 10amp brake fuse in the fuse box inside the passenger compartment ?The fuse location should be in your owners manual.

could be a fuel lag prob from a plugged fuel filter

Possible computer programing issues with fuel air mix

Could be your blower motor resister,here's a link to what it looks like,it's located next to blower motor,easy to remove,disconnect electrical connector,remove 2 screws,can't look at it to tell if bad.Here's where the blower motor is.

Do you have an OBD1 Code reader (1981 thru 1995)It goes under the dash the same as OBD2 in the DLC

I have seen many ign switchs. Check to see if the theft doesn't flash when you try to start. It is still posable that the starter is going. Have someone crank the engine. Check for power on the purple wire. If there is power and the it does not crank. Check that the big wire has a soild 12 volts. You can use a screw driver and jump the purple and the big 12v battery at the starter and it should turn on if not replace the starter

Fuel gauge issue : this could be the fuel level sensor on the tank. its only a minor thing. with in regards to the lights it sounds like there is a wire that is shorting out causing it to stay on but take it an electrician and they should be able to test for this, and also the light switch could be faulty aswell and wont let the light turn off

The door switch has been integrated into the latch mechanism on many GM vehicles,but I believe the switch can be replaced seperately.You will have to pull of the door trim panel to get at it,so you can probably do it yourself,depending on your skill level.