20 Most Recent 2004 Chevrolet Silverado 2500HD Questions & Answers

I would just about bet a weak fuel pump. With a scan tool connected you can monitor your fuel pressure thru live data. Low fuel pressure will not set a check engine light except if the O2 sensors register a lean condition.

I don't think you will know whats going on until someone takes the transfer case apart. It could be the shifter stuck in mid position and it is not completely in either position.

could be the alternator

TOT.PART:(French) stands for TRIP: an (English).You were holding the "Reset" button a bit too long and have changed the language options.Solution: Hold the button a bit longer until you get it back to English.

GM has a known problem with the electric actuators that operate the blend and temperature doors in the HVAC system. There are 4 or 5 of these in the typical system. Any can start sticking or binding and cause this problem. Sometimes they can be cleaned, or they might need to be replaced. Sometimes resetting the HVAC system controller by disconnecting the battery for 10 minutes, then reconnecting it, will correct the problem.

Under intake manifold on top of block,you need to remove intake to access sensors there are two of them you can't miss them when intake is off. After replacing sensors you need a new intake gasket.

sure your not turning key to accessory position ? but then key wouldn't come out. maybe ignition switch is the problem.

If you're comfy with manuals then i know few websites that can help you with it. Bcause I've got it from various websites so I know how each site deals. try www.reliable-store com . Very helpful

Most companies that produce oils and fluids for the consumer market publish an application catalogue which is often found online. These provide type and grade recommendations and quantities for many models so choose your favourite brand and search...

The gas tank on your truck doesn't decide when the gas pump shuts off. It sounds like you think it's not as full as it is. Make sure your looking at the gas gauge instead of the temp gauge.

Sounds as if you need to trace the wiring from the box to the plug, looking for a pinched or broken wire. There are special tools made to help find the break, but a visual inspection may well find the fault. If not, you can use a cheap test lamp with a pinpoint tip to probe the wire moving from front to back until you find where the current no longer shows.

Lots of reasons ! The most common cause of battery drain on a good battery is leaving an accessory on (courtesy light?). A pure guess with no information would be the starter is on its' last legs. It might be the alternator or there could be a short to ground from corrosion/age. There are lots of troubleshooting guides on the web for a battery draining, here is an example: http://www.gmtruckclub.com/forum/threads/battery-drain-issue.28504/ If you need further help, reach me via phone at https://www.6ya.com/expert/david_1f7d1c330c9dd97d

Remove both of the ac connections under the hood in the firewall.. use a garden hose on the disconnected pipes and have someone slowly turn the water on...do one side first, then do the reverse side..this will flush the system of build up or corrosion...you should see dirty water, then clean water coming out...reconnect hoses at firewall..cheers

I doubt you'll be able to buy a wiring harness from a dealer for a 13-year old vehicle. Plus, I doubt that it's a separate harness in the first place. Plan on visiting a junkyard and doing a LOT of splices

check the fuse check the relay check the compressor and freon level

Engine noises are hard to diagnose when following a description. Have you tried a stethoscope or a socket extension pressed against the pan to isolate the location? It is possible a crankshaft bearing or a connecting rod bearing has spun or is scored. If you can confirm the noise is in the bottom end of the engine and its approximate position it's time to remove the caps looking for a failed bearing. The block transmits noises very efficiently so be sure the noise is not being transferred from a different location. Here some info on the bottom end: King Engine Bearing Crankshaft Installation Guide Feat XP Bearings

14 volts is close (14.5-14.8 volts is required and 9 when shut down indicates a bad battery have it load tested and then have the alternator tested for rectifier pack operation there should be 14.5 volts DC at the battery when running or it is not charging the battery if you have 14 volts AC replace the alternator with a serviceable unit