Re: Service hybrid system message with no CEL
https://cimg7.ibsrv.net/gimg/www.gre...9e75a717d6.jpg
This old Tahoe Hybrid makes me smile every time I jump in in to drive off..................... Great information RyeTom. Thanks for posting and thank you very much for following up. Not a huge amount of information on the GM Two Mode Hybrids out on the web but from everything that I have seen so far the battery management system that they developed is pretty good and most of these batteries are lasting a very long time. I wish I knew more about it but it sounds like they are simply keeping the battery from overcharging too much and then preventing it from discharging too much i guess that keeps it in a sweet spot so it lasts longer? Now if I can just find a youtube video showing me how to check the cooling fan on my 09 I will put that on my list to check plus I REALLY WANT TO SEE THE BATTERY Hahahaha. |
Re: Service hybrid system message with no CEL
Originally Posted by RyeThomas
(Post 266048)
Ok so dealer called, it’s one of the control modules. It needs the new module then has to be programmed to the truck, I should have it back tomorrow evening or Wednesday at the latest. I will post up exactly what the service ticket says, really glad it’s not the battery. |
Re: Service hybrid system message with no CEL
serial gateway module, it’s under the hood. |
Re: Service hybrid system message with no CEL
Originally Posted by RyeThomas
(Post 266992)
serial gateway module, it’s under the hood. |
Re: Service hybrid system message with no CEL
Originally Posted by Stephen Hodges
(Post 266993)
my 2009 hybrid Tahoe the battery under the hood went dead. Replaced the battery and now it won't start and is throwing the service hybrid system code. Hooked a snap on scan tool to it and it said that the hybrid battery is over charged. I decharged all 40 cell batterys to 6.9 volts. The computer still says the hybrid battery is still over charged. Hopefully replacing the module will work.
|
Re: Service hybrid system message with no CEL
Originally Posted by Jaime
(Post 266995)
What were the codes you got from the snap on scan tool?
|
Re: Service hybrid system message with no CEL
Originally Posted by Stephen Hodges
(Post 266996)
THE GUY SAID THAT THE HYBRID BATTERY WAS STILL SAYING IT WAS OVER CHARGED AND THAT HE COUNDNT GET ANY further than that. Almost like the truck was in in lock out safety mode because of it.
|
Re: Service hybrid system message with no CEL
Originally Posted by Jaime
(Post 267000)
I'm looking at the service manual and don't see any diagnostic codes that say that the hybrid battery is "overcharged". Is it possible the mechanic is misinterpreting the diagnostic trouble code description in the Snap On tool? Did your Tahoe work correctly before the 12V battery died? If so, I highly doubt your High Voltage hybrid battery is at fault. There is a P0563 "System Voltage Too High" that is actually the 12V battery voltage, not the hybrid battery voltage. One of the conditions that can cause that code is if a charger was plugged into the 12V battery with the Tahoe system On and it detected higher voltage than normal in the hybrid powertrain control module (HPCM). This code is set when "The HPCM detects system voltage [on the Ignition voltage circuits] is 18 volts or greater for 5 out of 6 seconds." Read the voltage to the Hybrid Powertrain Control module with the Ignition On. It is possible the power inverter module (PIM) may be bad.
|
Re: Service hybrid system message with no CEL
Originally Posted by RyeThomas
(Post 266992)
serial gateway module, it’s under the hood. |
Re: Service hybrid system message with no CEL
#PIT4585E: 2-MODE (HYBRID) No Crank After Discharged Or Dead 12v Battery - (Nov 16, 2012)
Anytime a battery charger or booster pack is connected to the 12V battery, the ignition key should always be in the off position. If this recommendation is not followed, the Serial Data Gateway Module (SDGM) may not report "Crash Sense Failed" and the 300v Hybrid Battery Contactors will remain open until the Hybrid Powertrain Control Module's (HPCM) High Voltage (HV) DTCs are reset. To reset the HPCM HV DTCs, please use the following procedure:
ADDITIONAL SI KEYWORDS:PIT4585 draw drain electrical engine HCP M99 mode nocrank proactive SDG two unwanted voltage Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed. |
All times are GMT -7. The time now is 04:12 PM. |
© 2024 MH Sub I, LLC dba Internet Brands