Top 20 2003 Chevrolet Silverado 2500HD Questions & Answers

Recommend going back to your mechanic. Especially if you were not having problems prior. If you were, then perhaps the fuel filter was not the issue.

i think you will but get a second opinion

Hello Hyde Gillen, What you don't know... There are DIFFERENT types (other than vacuum ) of BRAKE BOOSTERS... More Information for ACDELCO 1780683 YOURS is HYDRAULIC assisted... meaning... when your HYDRAULIC pump fails... (not power steering) EXACTLY like AIR-BRAKES... (Compressor fail)... The BRAKES get applied...!! >> AS designed...!! << You CANNOT let your HYDRAULIC systems fail... You cannot even steer your vehicle... (don't worry about yourself)... TRY WORRING about the OTHERS innocents you are putting in DANGER. I think you are on the RIGHT TRACK... truck is fine... YOU just need to expand your understanding of AUTOMOTIVE mechanics. Good work... KEEP STUDYING. Carnac the Magnificent

Most causes are: bad connection at battery post, corrosion inside connectors where they meet the battery posts. Bad ground connection where negative cable bolts to engine and frame. Bad alternator , take it to another auto parts store or alternator repair shop and have them test it, sort of like having a second doctor's opinion. I'd say the alternator is bad if it has a lot of miles /age on it.

No , it's not a trans module . Do you know how the starting system works ? Do you know what a wiring diagram is ? Do you have an know how to use a volt meter ? Going here http://www.bbbind.com/free_tsb.html free wiring diagrams . You need to look an see what all is involved in the starting electrical circuit before guessing as to what the problem is . Enter your vehicle info - year , make , model and engine size. Then under system click on engine , then under subsystem click starting .Click the search button then the blue link. Looking at the wiring diagram i see IGN E fuse 10amp , the park neutral postion switch , starter relay , IGN A fuse 40 amp . I do not see a trans module , but i do see the PCM -powertrain control module . The PCM has both trans an engine control modules in one box. The PCM will energize the starter relay if there is no anti-theft system . Do you have a security light lit on the insturment cluster ? No crank good starter how to troubleshoot any car Hyundai

Heated seat control module is probably at fault . Have checked for DTC'S - diagnostic trouble codes .

you have a relay problem...look under the chevy forum.com or simply google the schematics for electrical relays for your year make and model..GOD bless

check plug under seat look for corrsived prongs in plug

View scan data would show what's wrong , do you know what scan data is .If not ,suggest you take it to a qualified repair shop. 047 Engine Hard to Start or No Start Scan Data for Ignition 048 Engine Hard to Start or No Start Scan Data for Starting Problems

Unless you really know what you are doing it is best to get a mechanic to repair this. People's lives and safety are at risk and you could be held legally if something went wrong with your repair job. I would not touch it.

Harmonic balancer.

Battery was completely dead ? after how long , over night , or just out of the blue ? These year GM vehicle's 03 to 06 have instrument cluster problems , draining the battery . Do you know what parasitic draw is ? Google it . They used lead free solder constructing the electronics , an after a while it causes silver migration . Chevrolet Truck Battery Dies Overnight Part Chevrolet Truck Battery Dies Overnight Part II

Sorry but with all the work you have done this is really not the kind of problem that will get solved over this keyboard, I speak from 35 years of expertise. What needs to be done is to have a GM dealer hook up a device called a flight recorder, it monitors the engine performance in real time and can record any problem s like the one you are having. You need to figure out if the fuel pressure is dropping off, or the ignition has a fault or the injector or injectors are causing this or an engine wiring harness issue or if the PCM is the real root cause and many more possibilities.. These tests are time consuming and are not cheap to have done, but it is what is needed if you are to get this fixed. OR you can sell or trade the truck.

I believe it has a PassKey type of module that requires the correct key inserted in the ignition key cylinder before it will start. It is extremely difficult to disable it, but you may be able to figure out a way with the wiring diagram for the truck (check a service manual or try Alldatadiy.com).

Is there a circuit board inside with soldered componets ? May have silver migration problem , they used solder without lead ! GM has same problem with instrument cluster draining the vehicle battery . Chevrolet Truck Battery Dies Overnight Part II Watch this video . You may want to ask these guy .

make sure that your vehicle has a "on the go" 4wd operation if not , you will have to all but stopped to get around the gear slashing if you have "on the go " engagement , then is a problem in the synchro rings of the transfer case take it to an accredited transmission specialist for a proper diagnosis

Codes? compression test? How long does it run at start up? Can you drive it before it dies?

Common problem on 2001 to 2004.5 LB7 engine but occurs when the problem is due to excessive internal leakage in your injectors dumping fuel back on the return line. Most shops change all injectors as bosch does not have a test to check each injector that will show leakage volume.

If it is automatic shift solenoid fault, but you need to have it scanned for trouble codes before replacing any parts, also could be torque converter slip but having it scanned will be priority. If it is manual it will be internal such as, shift rail, interlock, or shift collar.

How many miles does it have on the odometer ? The reduce engine power has to do with the ETC electronic throttle control . May have TPS - throttle position sensor problem or the APP sensor . 04 Silverado REDUCED ENGINE POWER Case Study Part 1