20 Most Recent 2003 Chevrolet Suburban - Page 5 Questions & Answers

You have a ground problem. In order for an electrical circuit to work it has to flow without resistance. Generally the resistance will be found in the grounding of the system. One light is not grounding properly and the other light will feedback through the other light to obtain a ground and causing the problem your experiencing. These problems where non-existent before computers, That is why I drive the CLASSICS

check the drain on the ac,possibly reseal the windshield.also, the firewall may need to be resealed anywhere wires,etc. pass through it.

You need to replace the Unlock Relay, it should be in the fuse panel on the passanger side.

Do you hear the fuel pump come on if you havesomeone by the tank & cycle the key on/eng off ?Have you checked for fuel pressure with a gaugeon the engine port?PO 300 is random misfiresThat is of little value until it startsHow old is the batteryIt can turn over the engine,then dropto 12 volts & not allow the computerto do it's job.loss of module voltage.Your best to have a shop use a scan tool& their experience to see what is missing.

Does your stereo have a manual volume adjustment knob? If so, then try twiddling it quickly from side to side. If this helps, then it could be a poor volume control issue. Try having this professionally cleaned or repaired. If not this issue, then also try removing the stereo and checking the wire connections on the back of it to the speakers. I'm assuming that all the speakers are failing to project sound when the fault occurs, so we are talking power issue here. The fault is most likely part of the stereo head unit.

Hi Msch, As your vehicle is a relatively late model I think it would be fitted with electronic transmission control modules. As you have lost power to the speedo and other circuits, you may have a problem with the speed and ABS sensors. The signals from those send command signals to the management system and control both vehicle speed and gear changes. Take the vehicle and have a diagnostic scan carried out. I believe the problem to be electronic and nothing to do with how much ATF is in the box. I do believe the electrical problems are related. Regards John

Whenever this warning light or any other stays on in the dash it is indicating that the systems control module (or the system sensor in the case of lights like low oil pressure, door open indicators etc.) has detected a fault, it then disables the system (this applies to ABS,TCS, TCM, SRS and BCM faults) as long as the light is on. You must now have the dealer hook up a special electronic diagnostic tool and "scan" the system for the fault code that is stored for the problem(s)

Legend of Abbreviations. ABS Antilock brake system.TCS Traction control system, TCM Transmission control module, SRS Supplemental restraint system, BCM Body control module

Could be a bad ignition module (key switch) but more likely than not you fried a relay and your fan relay is providing constant hot to your fan. Swap the relay with another one in your system (or with a spare if you have one).

Under the truck is the bet I can do, we have no diagrams what so ever. You can access the factory manual here for a small fee. www.alldatadiy.com I have no affiliation with the site just passing on the information to aid you.

Yes there is > Remove the rear cover and locate the dimple in the pipe it is there when you open the pipe>good luck , hope you have an oriface tube puller.