20 Most Recent 2005 GMC Sierra 2500HD 4WD - Page 6 Questions & Answers

check for a loose vacuum line behind the glove box.

You have a broken wire or a tail light wire shorting with the brake light wires. More than likely you will find the problem in the trailer wiring. The brake lights power is backfeeding through the tail light wiring.

check or change the fule filters first also check air filters

Did the battery need to be jumped before this problem or disconnected? You may need the computer reset at your local repair place. normally the computer resets itself but sometimes it needs a tester put on it to reset it. Hope this helps.

You have a bad universal joint. you have to take the spindle off to replace this. once the spindle is off you can pull the shaft out. the universal has to be pressed out and back in. As far as the binding, that is normal in close tolerance turns. you get it alittle more with bad joints.
Randy

Hi, the blower module that is located at the bottom of the heater box, next to the blower motor, above the panel below the glove box, has a tendancy to go bad, possibly overheat, and melt the larger of the two connectors. This can lead to one or all sppeds inop. the module will need to be replaced, and th connector inspected. If the connector is melted, or discolored, it needs to be replaced. A pigtail with wires, and connectors, as well as the resistor, should be available at a local GMC or Chevy dealer. Good luck...Coop

Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Silverado instrument cluster repair
Pretty common problem with these. Here's a guide to learn how to fix GM instrument clusters yourself, I used it to fix mine and it worked great.How to guide for Sierra instrument cluster repair

you need to replace the vent purge solenoid. this is what vents the air out of the fuel tank when you fill up and what is causing your code. it is available at your dealer, and is a fairly common issue. good luck!

The speed sensor is probably bad. Its located on the transmission

Issue with your Connection Check under the Bumper for Bad Connection Due to Corrosion on the contact itself ...Clean contact end put heavy grease into it to prevent eventual corrosion ..good luck

This is normal if you are on black top or concrete.The 4wd is only meant for mud or snow not dry pavement.Hope this helps.Good luck.

Look in your owners manual if manual settings, if auto settings on the steering wheel, using the upper left button scroll through selections until you see settings. It gives you options as far as time you would like the interior lights to stay on, or if you want them off. Sounds like the obvious fix to me. If not, check fuse bank under hood, left side, or on panel located on left side of dash panel when you open the door. The diagram will tell you which one to look at.

Just fixed this tonight! If you let it go, your right rear turn signal will also quit working, and front and mirror signals willbe OK. Have someone watch while you have the Right turn signal on, and lay something heavy like an 8" cocrete block wedged on the pedal. Crawl under the back and looking forward, look at the crossmember that is to the left of the tire. There is a Connector block with 4 plugs. Wiggle the far left blue one. If it works intermittently, that's your problem.

The fix is - clean with CRC or equivelent electrical cleaner, then CAREFULLY take a knife or screwdriver and ever so Slightly move/bend again carefully each of the six pins to the left all the same. I am talking like only a few degrees here, but carefully slide the plug back on and you should have contact. It seems a ground in that plug controls what I just discussed what can be wrong.

Check little hose that air get's pump it to it, make sure hose is good, also while down there with hose off of air pump feel if you feel air coming out while pushing switch, if all good the air bag in the seat is bad.

ac delco

may check or have the dealer check for a crack in the housing for the fuel filter have seen it a few times specifically in heat cause every thing expands more it will start sucking air and lose pressure

they have an extended warranty on the speedometer cluster 7 years or 70,000 miles .

they have a extnded warranty on the speedometer cluster 7 years or 70,000 miles

check for blown fuses under dash @ under hood in black box.