error on odometer, no start - Pontiac G6 Forum
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post #1 of 22 (permalink) Old 01-03-2012, 12:18 PM Thread Starter
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error on odometer, no start

Hello,
My son's 08 G6 will not start or even try to turn over. It shows error on odometer after all needles have swung on the cluster.I searched the forum for solutions and tried some to no avail. Borrowed a diagnostic tool from a friend and it showed the following... lost communication with engine control module/powertrain control module "A". Also want to add that battery shows only 9 volts at terminals + neg. cable is a bit loose connecting to battery. Will a low battery cause this lost communication thing? Or is it likely that it is the battery and something else also. Hope someone can help as he and his wife have a brand new baby and just bought the car 4 or 5 months ago so they would have something dependable. Car only has 46000 miles. Thank you !!
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post #2 of 22 (permalink) Old 01-03-2012, 01:09 PM
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The car won't run on 9 volts. You need to charge your battery (if possible). If that doesn't up the voltage on your battery to 12.8V or more then you need to get a new battery.

Error on the odometer usually means a miscommunication between the PCM (and sometimes BCM). In my case, I had to get a new PCM. Your first order is to get the battery functional though.

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post #3 of 22 (permalink) Old 01-04-2012, 06:06 PM Thread Starter
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Well, we got a new battery as the old one was shot. However, it did not solve the problem. Still nothing and swinging needles and error on odometer. Advice on next step? New PCM? Grounds seem ok. Tried swapping little modules in fuse box. Tried shifter in park and neutral. Wadda ya guys think?
Thanks.
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post #4 of 22 (permalink) Old 01-04-2012, 06:28 PM
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Since the battery is new and the odo shows error, then your PCM is likely done, It's located in front of the battery box in plain view in the engine compartment, I suppose you can try to:
Disconnect the battery, Unplug all the connectors from the module, and try to clean both the plugs on the wires and the module, once it's all dry, reconnect and then reconnect the battery. if that still doesn't do it then you need a new PCM.

If you get a new one you'll need to have the PCM programmed with the VIN for your vehicle for it to work, and if it's a new unit it may require a CASE relearn in the future.
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post #5 of 22 (permalink) Old 01-04-2012, 06:41 PM Thread Starter
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Bummer! Ok...forgive my ignorance. How or who do you get to program the PCM and why the vin and all that? And...a CASE relearn? Huh? Please explain.
Thank you.
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post #6 of 22 (permalink) Old 01-04-2012, 07:28 PM
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I believe only the dealer can do all that. not sure if you are within your bumper to bumper warrante or not but might be able to have them cover it.
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post #7 of 22 (permalink) Old 01-04-2012, 07:31 PM
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Quote:
Originally Posted by Neb View Post
... neg. cable is a bit loose connecting to battery. Will a low battery cause this lost communication thing?
Not sure exactly what you mean here. All battery cable connections must be corrosion-free & tight. Especially check the battery ground straps. A poor battery connection can cause the described symptoms. If no joy after cleaning & tightening all battery connections, I would consider taking it to a mechanic for a diagnosis. Then maybe you can DIY the repair.



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post #8 of 22 (permalink) Old 01-04-2012, 07:35 PM
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Another member got the same error after a transmission swap and found out that his starter motor ground was loose.

Thread: https://www.g6ownersclub.com/forum/sh...ad.php?t=10200

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post #9 of 22 (permalink) Old 01-04-2012, 07:40 PM Thread Starter
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Will double check a few more grounds. Still don't knoe what a CASE relearn is. Any one want to explain. All the electronic gizmos gives me a headache sometimes. Thanks
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post #10 of 22 (permalink) Old 01-04-2012, 07:45 PM
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crankshaft angle sensor error or something like that, Google it and you might have some alternative solutions before taking it in.
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post #11 of 22 (permalink) Old 01-04-2012, 11:21 PM
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A crank relearn just learns the position of the Crankshaft Position Sensor. It's mainly there to aid the computer in compensating for misfires. Due to the constant changing in timing these cars do they're bound to miss a fire here or there. So when the knock sensor detects a misfire condition, the computer can quickly retard timing or adjust any one of many many things to stop the misfire and keep it running good. You'll know if you need this by the check engine light being it. The engine and car will still run and drive though.

There are a lot of ground points to check, but even if their nice and tight, check for rust or the integrity of the wires themselves. Check all ground and positive connections too, Just make sure plugs are in all the way
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post #12 of 22 (permalink) Old 01-05-2012, 07:46 PM Thread Starter
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Will do! As for the programming of the PCM if I need one...is it strictly dealership stuff?
Thank you
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post #13 of 22 (permalink) Old 01-05-2012, 08:35 PM
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Quote:
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Will do! As for the programming of the PCM if I need one...is it strictly dealership stuff?
The PCM & it's programming is covered under the powertrain warranty for 5 yr/100K miles so that would not cost you anything if that's the problem.




Last edited by greenman; 01-30-2014 at 12:26 PM.
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post #14 of 22 (permalink) Old 01-05-2012, 09:08 PM
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Which engine is in that vehicle?

If it's the 4cyl Ecotec, problem could be ground 105:


Service Information 2008 Pontiac G6 | G6 (VIN Z) Service Manual | Document ID: 2200174
--------------------------------------------------------------------------------

#PIC5003: No Crank / No CommWith U2105 U2106 U2108 U2109 (LE5 Only) - keywords 2.4 2.4L communication start - (Oct 15, 2008)


Subject: No Crank/No Comm with U2105 U2106 U2108 U2109 (LE5 Only)


Models: 2008-2009 Chevrolet Malibu

2006-2009 Pontiac G6

2009 Saturn Aura

This PI only applies to vehicles listed with (LE5) Engine only




--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A condition has been identified that could cause a NO crank/No communication on the LE5-4 cyl engine. This condition has been identified as a loose ground G105 behind the A/C compressor.

Recommendation/Instructions:
Remove the bolt from G105 and clean the engine block surface. You should also make sure the terminal is tight after the bolt is tightened up. There have been reported cases of the bolt bottoming out in the hole and not generating a clamp load on the terminal.

Important: Please reference Document ID: 1986240 for location purposes.

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.



GM bulletins are intended for use by professional technicians, NOT a ""do-it-yourselfer"". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
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2012 General Motors Corporation. All rights reserved.




Last edited by greenman; 01-05-2012 at 09:11 PM.
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post #15 of 22 (permalink) Old 01-05-2012, 09:22 PM
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This applies only if you have the onstar module:


Service Information 2008 Pontiac G6 | G6 (VIN Z) Service Manual | Document ID: 2324430
--------------------------------------------------------------------------------

#PIC4677C: No Start No Crank Intermittently / No Communication Over High Speed LAN - keywords connector inop inoperative lamp light loose message on onstar U0121 U0101 U2100 U1040 P0700 P2544 U0073 VCIM warning - (Aug 10, 2009)


Subject: No Start No Crank Intermittently/No communication over High Speed LAN


Models: 2008-2010 Chevrolet Malibu

2006-2010 Pontiac G6

2007-2010 Saturn AURA




--------------------------------------------------------------------------------

This PI was superseded to update model years. Please discard PIC4677B.


--------------------------------------------------------------------------------

The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.

Condition/Concern:
A customer may have a complaint of an intermittent no start, no crank condition, and or SES light on with I/P gauges intermittently inoperative while driving. Any of the following DTCs may be accompanied with this complaint. U0121, U0101, U2100, U104, P0700, P2544, U0073

Recommendation/Instructions:
Before beginning to deep dive into any diagnostics first (If equipped) check the VCIM module (Onstar) connector C3 (Black) to be sure that it has been fully seated. This connector has been increasingly showing up as the root cause for loss of HIGH speed LAN concerns.

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.



GM bulletins are intended for use by professional technicians, NOT a ""do-it-yourselfer"". They are written to inform these technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions, and know-how to do a job properly and safely. If a condition is described, DO NOT assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See your GM dealer for information on whether your vehicle may benefit from the information.
WE SUPPORT VOLUNTARY TECHNICIAN CERTIFICATION


2012 General Motors Corporation. All rights reserved.



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