Question about 2003 Chevrolet Silverado 2500HD

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2003 Silverado 2500HD shut off driving on road, too!

This sounds SO MUCH like the dash data window display you observed re: Service Brake System and wouldn't even crank over after it completely quit running without any warning on a 65 mph interstate !!!! This vehicle's Engine light was on, ABS light was on and the Parking Brake light was also on all at the same time! Triple A brought the truck back to driveway with my thoroughly rattled son in addition.
Eventually I tracked it down to a failed PCM B fuse. Replaced that 20amp fuse and the engine started and ran well, the voltmeter was indicating approximately 14 volts.......ran for maybe 2 minutes and shut off again. The PCM B fuse had failed again! After installing yet another PCM B fuse my son took off for the closest AutoZone to have them scan for codes. After replacing several PCM B fuses on the way, he finally rolled into their parking lot. AZ guy came out to scan the data port with no codes showing up for his efforts after the, guess which one, fuse was replaced. I'd searched the on-line forums after he returned with the remnants of a new 25 pack of 20amp fuses he'd returned home with and the no codes news. ......... therefore, I headed for our computer to search for answers. anyhoo--

As has been reported in many different forums the PCM B fuse is usually determined to be compromised by a fuel pump circuit overloaded condition. Could be a result of a restrictive fuel filter, wiring terminal issues, normal wear? at 99,500 miles, ground path issues, etc.
After digesting and weighing the opinions I'd read that night (Friday), the next morning I had turned the key on, without starting the engine, and wrote down all the observations which took maybe 5 minutes prior to heading off,( in my perfectly trouble-free FORD F-!50!) to buy and install a fuel filter to eliminate that potential problem. But....before heading off, I attempted to start the engine again. This time it sounded like a spastic rattle of a weak battery and all of a sudden all the dash lights were flashing on and off in perfect unison almost like the 4 way flashers were turned on and driving the dash lights nuts as well. WOW!!! WTF?
The battery had been load tested twice--prior to my finding the first failed PCM B fuse AND at the time of the dash to AutoZone for expected code retrivals-- after all that confusing flashing dash lights conundrum I checked the battery with my OTC digital DVM and observed 12.07 volts. hmmmmmm Anyways, guess who was thoroughly thrown off his original stream of logical approach to troubleshooting. The 60 years old man with a cane trying to sort out the problem and save his son some money. Then, the son called me telling me that he seriously needed the truck for his business Monday morning.

Anyways, we took the highly valued advice of a friend to take the vehicle, at Triple A's expense, to a highly recommended independent service technician's shop. He immediately installed a new battery--the battery had 5 volts was his report--replaced the "FUSE" and as usual, it started and ran for a while. He called my son with the diagnosis 5:30 Friday afternoon and said he'd call again with more info. Not having a firm commitment to the extent he was going to continue with the project, I went to the fellow's shop to see that the doors were still open when I arrived. After finishing his chicken wings and pizza he was going to get back to the project....... He required no further information from me and would call my son to continue with his diagnosis. My son called me about 7:00pm Friday night and was told a $800 repair, which the tech could accomplish Monday was the plan of action. Replacement of the fuel pump was indicated. My son trusts me to make the right decisions for him in these situations. I can somewhat agree that installation of a new battery is in order to start the process, but not being confident that there may not possibly actually be a PCM issue to address before fuel pump replacement is causing me to ask for your advice. If I were to have the Chevy towed home and change the pump myself, which I've previously done myself in our driveway just a few weeks ago on another son's 2001 GMC Jimmy, and find that in fact a PCM replacement was required, there may be yet a further investment that the tech may tell me he isn't interested in helping us with.
My technical background is hydraulics, diesel,and a smattering of ECU apllication on turf equipment. Nothing as involved as automotive electronics and systems' logic theory these "new fangled" vehicles employ. Thanks for giving me your professional advice and I firmly believe you've had a few chuckles at my expense in return.
Oh, yeh! early Monday morning is approximately 14 hours away. HELP ME ASAP!!

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I would recommend going to a dealership. Though more expensive, they are far more reputable than some guy that like chicken wing & pizza on his 9th 15 min break haha. Dealerships always go about the right diagnosis and approach to each issue, 1) the Car 2) the customer 3) everyone being happy in the end. Good Luck :)

Posted on Sep 27, 2009

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