» » »

Pontiac Q&A

Ask Your Question

2008 Pontiac G6 Question: Car will not start or even turn over.

 

Question

michellelee, Cuero, TX, May 05, 2012, 13:33
 Rookie

Car will not start but the radio comes on, electric doors lock and open and windows work. Tried a new battery. had starter tested its ok, ran a test and it gave an error u0100 lost communication with ECM/PCM "A". Took the PCM module out and cleaned it up. Have left battery cables off for two days to see if it would reset the issue. Have not used any other key but the one it came with. At one point a light lit up that had a car and lock like the anti theft was having an issue. That has since gone away and radio, windows, locks and all are working. Its been 2 weeks and have not gotten anywhere.

2 Answers
Flag This
  • Answer #1

    rivera racing shop May 05, 2012, 16:20
     Rookie

    look
    http://www.cadillacforums.com/forums/cadillac-sts-forum-2...

    DTC U0100-U0299
    Circuit Description
    Modules connected to the high speed GMLAN serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

    DTC Descriptors
    This diagnostic procedure supports the following DTCs:

    DTC U0100 Lost Communication With Engine Control Module (ECM)
    DTC U0101 Lost Communication With Transmission Control Module (TCM)
    DTC U0104 Lost Communication With Distance Sensing and Cruise Control (DSCC) Module
    DTC U0121 Lost Communication With Electronic Brake Control Module (EBCM)
    DTC U0141 Lost Communication With Instrument Panel Module (IPM)
    DTC U0181 Lost Communication With Dynamic Headlamp Leveling (DHL) Control Module
    This vehicle has DTCs which include DTC Symptoms. For more information on DTC Symptoms, refer to DTC Symptom Description in Vehicle DTC Information.

    DTC Symptom
    DTC Symptom Descriptor

    00
    No Additional Information

    Conditions for Running the DTC
    Voltage supplied to the modules is in the normal operating voltage range.
    The vehicle power mode requires serial data communication to occur.
    The DTC U0001 does not have a current status.
    Conditions for Setting the DTC
    A supervised periodic message that includes the transmitter module availability has not been received.

    Action Taken When the DTC Sets
    The module uses a default value for the missing parameter.

    Conditions for Clearing the DTC
    A current DTC clears when the malfunction is no longer present.
    A history DTC clears when the module ignition cycle counter reaches the reset threshold, without a repeat of the malfunction.
    Diagnostic Aids
    A poor connection at the inoperative module may cause this code to set.
    An improperly powered module may cause this code to set.
    Step
    Action
    Yes
    No

    Schematic Reference: Data Link Connector (DLC) Schematics

    Connector End View Reference: Master Electrical Component List in Wiring Systems

    1
    Did you perform the Diagnostic System Check - Vehicle?
    Go to Step 2
    Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

    2
    Did you record any DTC in the range of U2105-U2199?
    Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information
    Go to Step 3

    3

    Important
    Use the DTC list in DTC Descriptors to determine which module is not communicating.

    Test the following circuits of the module that is not communicating for an open or a short to ground:

    The battery positive voltage input circuits
    The battery positive voltage output circuits
    The ignition voltage input circuits
    The ignition voltage output circuits
    The switched battery positive voltage circuits
    Refer to the following:

    Control Module References for the applicable schematic
    Circuit Testing in Wiring Systems
    Wiring Repairs in Wiring Systems
    Did you find and correct the condition?
    Go to Step 8
    Go to Step 4

    4
    Turn OFF the ignition.
    Test the ground circuits of the module that is not communicating for an open. If the module is the body control module (BCM), test its class 2 serial data circuit for an open, also.
    Refer to the following:

    Control Module References for the applicable schematic
    Circuit Testing in Wiring Systems
    Wiring Repairs in Wiring Systems
    Did you find and correct the condition?
    Go to Step 8
    Go to Step 5

    5
    Test the high speed GMLAN serial data circuits of the module that is not communicating for an open. Refer to Circuit Testing and GMLAN Wiring Repairs in Wiring Systems.

    Did you find and correct the condition?
    Go to Step 8
    Go to Step 6

    6
    Inspect the harness connectors of the module that is not communicating for poor connections and terminal tension at the following circuits:

    The battery positive voltage input circuits
    The battery positive voltage output circuits
    The ignition voltage input circuits
    The ignition voltage output circuits
    The switched battery positive voltage supply circuits
    The ground circuits
    The high speed GMLAN serial data circuits
    Refer to the following:

    Control Module References for the applicable schematic
    Testing for Intermittent Conditions and Poor Connections in Wiring Systems
    Connector Repairs in Wiring Systems
    Did you find and correct the condition?
    Go to Step 8
    Go to Step 7

    7
    Replace the module that is not communicating. Refer to Control Module References for replacement, setup, and programming.

    Did you complete the replacement?
    Go to Step 8
    --

    8
    Use the scan tool in order to clear the DTCs.

    Does the scan tool still display other current DTCs?
    Go to Diagnostic System Check - Vehicle in Vehicle DTC Information
    --

    Reply
    Flag This
  • Answer #2

    md_piercy April 28, 2014, 15:44
     Rookie

    I don't have the answer I saw the post was from a while back and was wondering if you found out the problem. I have a 2008 g6 that is doing the exact same thing. If you have doin the problem please e-mail me what you had to do. My e-mail is md_piercy@yahoo.com.

    Flag This
  • Reply

    sexysally22, June 08, 2014, 12:05
     Rookie

    hey did you find out what the problem was with your car

    Reply
    Flag This