help! truck won't move - Chevy and GMC Duramax Diesel Forum
07.5-10 LMM Duramax Powertrain Discussion of components that are directly involved in the power production and all that is needed to get and keep the truck moving . Engine , Transmission, Etc.

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post #1 of 4 (permalink) Old 01-21-2013, 09:41 AM Thread Starter
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help! truck won't move

Well it's -13 out today and started up the truck. Let it idle for about 25 minutes and got in and went to put it in reverse and the "R" just flashes... Trans temp is 74 degrees.... Any ideas?
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post #2 of 4 (permalink) Old 01-21-2013, 10:09 AM
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Possibly NSBU Switch frozen?? Not sure if its an issue on the new body style trucks. Any codes? Have you tried cycling the key a few times and trying again?

2005 GMC 2500HD 4x4 Duramax Allison Denali Headlights 285/55R20 Nitto Terra Grapplers on Black/Machined XD Hoss -12 Offset MBRP 4" Stainless Turbo Back Diamond Eye Turbo Direct Pipe LBZ Mouthpiece EGR Blocked & Cooler Bypassed PPE Standard Level 4 Autometer Cobalt Boost Gauge EDGE Insight CTS w/ EGT Probe Head Gaskets & Studs @ 145,000 MILES

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post #3 of 4 (permalink) Old 01-21-2013, 02:32 PM
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low battery voltage can and has caused me to end up in limp mode, shut the truck down, disconnect the batteries for 20min, reconnect them and see what happens. The low voltage is a combination of the cold and possible weak batteries, between your glow plugs and intake heater it really sucks them down. Turning on the heated seats and defrost when you start up only makes the problem worse. The TCM freaks out. I've had it happen once this year (it was -20F) truck would go into gear but only 5th, barely any useable power in reverse, I could barely back away from the curb going downhill.

2008 2500HD LTZ, EFI Live- Idaho Rob's Tunes, 4" Magnaflow Turbo Back, Raptor 150 Lift Pump, Transgo Jr, All Season Diesel EGR delete with high flow Y-bridge, Edge Insight for gauges,
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post #4 of 4 (permalink) Old 02-01-2013, 10:44 PM
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Did you figure it out?

09 Sierra CCSB - 8: Fabtech Long-Travel Dirt Logic lift kit, 37" Toyo MT's, 22" Hostages, FabFours bumpers, AMP steps, Titan tank, EFI 80hp tune, FloPro 5" exhaust, 100hp piggyback.
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