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Medium Duty Trucks Discuss GM Kodiak/Topkicks, 4500/5500 & up medium duty engine & all associated components.

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Old 10-12-2018, 11:32 PM   #1 (permalink)
mrrober
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Limp home mode

I apologize that I'm not real good at these things AND the stupid computer is acting up soooo here it goes.
I have the 2005 Kodiak C4500, LLY. The other day I noticed that the alternator was only putting out 7 volts BUT it was still running great and I took it homeand shut it off. I, as expected, replaced the alternator andf started it just to find that it was in the "Limp Home Mode". Everything reads as it should as far as voltage outputs and etc. It will now only come up to 1700 to 2000 RPMs and only about 5 to 7 MPH in that LHM. According to a Chevy mechanic, he said that the truck should reset if everything was returned to normal which it is. He also said there is a process that will reset the computer's parameters. This process is: Start the truck with A/C, heater, and defroster on and idle in gear for 3 min.; then ramp up speed to 55 MPH - 5min w/A/C, htr, and defrosters off; decelerate to 20 MPH w/o brakes or clutch; then accelerate back up to 60 MPH for about 5 min; and etc. The second step here of 55 MPH blows everything out of the water because I won't go over 5 to 7 MPH. Anyway does anyone know how to get this truck out of that mode. By the way I put the scanner on it and it came up with a PO727 code (speed sensor). It's been replaced and it is now completely free of codes. Any ideas.

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Old 10-13-2018, 05:12 AM   #2 (permalink)
oldschoolbowtie
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welcome to DP




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2007.5 3500HD Silverado LTZ
Kennedy Custom Tune Banks Intake and 4 " exhaust, Air Dog 150, Leveled front end, aftermarket upper control arms, tie rod end sleeves, bypass oil filter, Pusher 3" "hot side" charger tube, aFe Turbo inlet pipe, PPE deep Trans Pan with temp gage, 2 low mod for front differential disable, PACBRAKE 5000# Air Bags with remote on board air...otherwise stock


1953 Chevy truck 496 2 NOS kits ...otherwise stock


1927 Roadster 383 2 NOS kits chassis car (street legal)// otherwise stock

Last edited by OkDually; 10-13-2018 at 08:51 AM. Reason: thinned
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Old 10-13-2018, 08:54 AM   #3 (permalink)
OkDually
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Welcome to DieselPlace

I moved your post over to "Med Duty" for better views to your issues

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1996 K3500 6.5L,( "F" Eng #141 cast block) 5 speed manual, crewcab, dually longbed: 208,000mi.
Diamond Eye 4" Turbo Back Exhaust w/2.5" Flo-Pro Crossover
AirDog II DF165 w/ tank sock delete - XDP
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Boost & Fuel Pressure Bolts - Leroy Diesel
2/0 Battery Cable Upgrade - PT Wiring Solutions
PMD w/#9 resistor and Re-Location Kit, mounted to bumper - Leroy Diesel
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4.10 gear ratio
OptiLube Winter Formula


Proud member #1039 of The 3500 Dually Club

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Old 10-13-2018, 10:19 PM   #4 (permalink)
mrrober
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Okay. Thank-you!
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2005 Kodiak C4500, LLY
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Old 10-14-2018, 06:48 AM   #5 (permalink)
ronjhall
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to DP MDT's.
Many of the threads I looked at suggest doing a Google search using the Google link at top of forum. Duramax P0727. Found lots of hits but not able to follow them at this time. Give it a try.
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2004 C5500 Kodiak LLY. Gulf Stream Endura 25,000lbs with car, EGR Blocker & stick. PVC reroute. No programmer, Bilstien shocks, Ride Rite air Bags, Train horns, Filter minder, ISSPRO trans temp gauge, VDO EGT gauge, TST tire pressure monitor, Scangauge II, MBRP muffler, Modified turbo MP.
Avg mileage over 76k miles 10.3 mpg. Sold it 5/17.
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Old 10-14-2018, 08:38 AM   #6 (permalink)
Skipper56
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I realize you may have already covered this but is it possible you now (coincidently) have a plugged fuel filter, which will also put the truck in Limp mode(as I found out on a long drive home once with my 2005 LLY)
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Old 10-16-2018, 05:17 PM   #7 (permalink)
Glenn Meldrum
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I had a problem with the coolant light coming on followed by the engine shut down light. When I my rpms got low enough the engine would shut down and it would take a minute or two until I could start it again. Took to a shop and they put a paper clip in the end of the coolant tank plug and it helped for me to get away but kept acting up. Took it to the Chevy dealer in Truth or Consequences, NM and they diagnosed that the problem was in the instrument cluster. They turned off my engine shut off in computer so that hasn't happened again but the coolant light still comes on. Haven't had the time to get the cluster repaired to see if that was really the problem but from what I understand they had a lot of problems with these instrument clusters.
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