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6.5L Diesel Engine Discuss the 6.5 GM diesel engine & associated components. Automatic transmission questions & problems belong in the 4L80/85 - 4L60E - 6L90 Transmission Forum

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Old 12-18-2004, 02:49 PM   #1 (permalink)
caustin1
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2001 G3500 6.5td just dies when driving

I have a G3500 2001 all stock, other than having it converted to 4x4. 70,000+ miles with no problems and now when going down the road it will die. Much like turning the key off, I can restart right away and continue on. Sometimes it will die - start - die - start - run 30 seconds +/- - die - start and run for the balance of the trip. Very random, might happen after 50 miles, or right after first start of the day.

Any ideas to the probem? Took it to the GMC Truck Center in Oakland, CA., and they could not find any codes for the problem. They had it for two days and could not find anything. They did decide to replace the lift pump, but that still did not solve the problem.

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Old 12-18-2004, 03:15 PM   #2 (permalink)
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well, the lift pump sounds like a good place to start, often they can fail or operate intermittently and cause problems like this.
If your not getting any codes tripped, sounds like very good possibility of PMD failing on you. Before you change it, try the 'wiggle' test. Remove the dog house, start the engine and wiggle the wiring harness to the PCM and to the injection pump to see if you can make it stall, if not, 99% chance you need a new PMD.

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Old 12-18-2004, 04:26 PM   #3 (permalink)
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Thanks. I'll try that as soon as I can and get back to the thread.
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Old 12-18-2004, 08:48 PM   #4 (permalink)
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I pulled the doghouse and checked all the wiring for bad connections, nothing loose or broken. Looks like I'm off to the GMC Truck Center for a new PMD.


The same thing started happening back in Sept of 2002. The Truck Center had to replace the injector pump. Would they also replace the PMD at the same time?
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Old 12-18-2004, 09:46 PM   #5 (permalink)
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PMD is on injector pump. Stalling could be fuel supply pressure.
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Old 12-19-2004, 12:55 AM   #6 (permalink)
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My 96 1 ton was doing the same thing, the dealership replaced some sensor on the turbo for about $25 and it fixed the problem.
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Old 12-19-2004, 10:41 AM   #7 (permalink)
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The wg solenoid will help it stall but only if their's some underlyng fuel issue.
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Old 01-11-2005, 03:06 PM   #8 (permalink)
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OK. The van would keep stalling at odd times, normal operating temp., cold, after it set for an hour or so, fuel tank full, half full and almost empty. Gave up on the dealership finding anything, so I bought an inexpensive AutoXray scanner. The scanner came up with code P0251. Went back to the dealer and had them check it out, left it there and rented a Tahoe for a day or two.

Checked on the van three days later and found out they are going to replace the injector pump. The tech reviewed history and found DTC P0251, P1216. Found that the fuel system had metal in it.

They drained, (30gals), and removed the fuel tank and steam cleaned and dried it out, cleaned fuel lines replaced lift pump, (again), replace fuel filter. Reinstalled tank, replaced injector pump and added 5 gals of fuel. Road tested and found no codes.

The dealer had the van for 8 days, and were kind enough to pay for 3 days of the eight day rental.

Looks like every 35,000 miles or so I'll have to go through this. Both times now it took at least 3 different trips to them before they could find the problem.

Thank you guys for all the help.

Craig.
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Old 01-11-2005, 04:27 PM   #9 (permalink)
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The dealer is screwin ya, Craig.
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Old 01-11-2005, 04:30 PM   #10 (permalink)
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Ditto on the screw job Craig, I'm at work now in the thick of things I'll post more later, I suspect PMD or electrical problem. We will use this thread for the FAQS I seem to not have anything there for this problem and it is a common one.

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