20 Most Recent 2008 Chevrolet Silverado 2500HD - Page 3 Questions & Answers

try fluid and filter you my get lucky --but try scanning first for any trouble codes

Check for rodent damage. Do head lights or horn work (no key necessary) ?

If neither the headlights nor the horn are working then the BCM is not functioning. Check BCM fuses (more than one).

.threw low voltage to speed sensor ??? What's the code number P0xxx what ?. low voltage to speed sensor so you replaced it ? You people crack me up. you have a code reader pull a code an replace a part ,that's not how it works . In a service repair manual there are diagnostic procedures to follow for every code . Testing an not guessing is how to fix these type problems . I'm leaning towards the ignition switch what could it be . Wheel sensors.? Tcm? Speed sensor buffer ? Computer ? Quit trying to play auto tech . an take it to a qualified repair shop. you have no clue . The emergency brake light as you call it also comes on when there is a problem with the brake system and or the abs system ,hooking up a professional type scan tool an checking abs codes should also have been done . Which engine does yours have ? Engine Controls - 4.3L Engine Controls - 4.8L, 5.3L, and 6.0L

the ecm and bcm would need to be flashed to your vehicle

Automotive AC systems require periodic service. It could simply be low on refrigerant or other failure. Requires testing to determine root cause.Automotive AC systems of the era leak and every 3-5 years require additional refrigerant and possibly oil.

Check wiring harness may be broken somewhere or check relays and fuses.

Chevy IPCs of that era are notorious for draining the battery. The cluster fails to go into low power mode due to metal migration (solder whiskers).

See following Eric O videos... all you ever need to know on trouble shooting and repair.

https://youtu.be/irkWeLhl078
https://youtu.be/lhJpJHp9Ud4

I went thought the same thing with my 2012 Silverado crew cab . no movement to drivers window all others work Fine through master switch . replaced window motor - nothing happened replaced window regulator because i messed it up replacing window motor - replaced master switch twice - still nothing finally yesterday after work I pulled the covering off the wiring harness between door and cab and there she was broken ground wire - black wire . fixed it and window came back to life .

check for power to switch --proper install --or possible adjustment

Jump the switch side of relay with jumper wire, cavities for terminals 30 and 87 in diagram. As you see in diagram, terminal 87 shows to be fuse protected and hot all the time. switch side is left side of relay in diagram. The pump should run with jumper, don't need the key. You can also see fuel pump/oil pressure switch, redundant power supply to the fuel pump. Even w/o the relay, once you crank it enough to bring up oil pressure, that switch closes and the pump should run, depending.

Note the ps in picture. Your power steering pump is belt driven. I looked at info for 5.0L engine.

Chevy doesn't use vacuum modulators anymore

YOU NEED NEW ROD BEARINGS .

The search query for that has to be specific otherwise you get sites telling you the torque that the engine puts out, so; year make model (the part - cylinder head, main bearing caps etc) torque specifications Usually when you find one, they are all listed. please put year make model in all Fixya vehicle questions

What are the codes that are set before you "reset" them?

Not sure what plow or plough lights have to do with the turn signals - you surely haven't wired these high powered spotlamps to the direction indicators or even teed from any of the vehicle wiring? It isn't necessary but traditionally the speed of flash was governed by how much current the bulbs were drawing and suddenly flashing faster if a bulb went out was an accidental but useful benefit and so when electronic flashers came along the facility was deliberately built in. People who have fitted led bulbs that have no shunt resistors have complained about hyper flashing, because the current draw is negligible and when connection to the lamps is lost altogether due to a faulty hazard switch the dashboard direction indicator tell-tale can go crazy but fitting a couple of spotlamps causing that is a completely new thing... I am wondering if you followed the rules of wiring accessories to a digital vehicle? The rule is, wherever possible do not connect anything except manufacturer's upgrade kits to the vehicle wiring and when fitting electrical accessories always wire from scratch starting at the battery to keep the circuit completely separate and if a connection must be made to the vehicle electrics it should represent a load no greater than a relay coil.

You have too many zeros in your description - 25,000 revs and you would be picking up engine bits from half a mile away... 600 rpm in park and presumably revving up to 2500 when a gear is selected isn't the fault of an idle air valve (or the throttle positioning motor) but is the result of commands sent by the management system. Restoring factory defaults should restart the self learning process and disconnecting the battery for a few hours (overnight) might restore the defaults but it might need dealer level diagnostic equipment.

This was a common problem with 1988 to 1998 Chevy Silverado models. In 1999 the Silverado body style changed on the 1500 series but remained the same on the 2500 and 3500 series. The plastic cover on the wiper motor had major problems and most were under factory recall. Visit https://www.nhtsa.gov/recallsfirst to see if your truck is under recall. You will need your VIN number. It is on your title, on the drivers side at the bottom of the windshield ,or on the drivers door on a tag on the area where the latch is. If it is not being recalled you will need to check the vehicle when the wipers are not working. Raise the hood and look for the wiper motor. It will be on the firewall. Tap on the black plastic motor cover a few times with the handle of a screwdriver. If the wipers begin working after a few taps the cover is most likely faulty. The best part is that if that is the culprit it is fairly easy to change. Make sure you check for a recall first , we have literally replaced hundreds of these under full warranty. Hope this helps.

might be ecm fuse is blown

What year is the truck ?