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Thread: Battery change causes default mode??

  1. #1
    Join Date
    Mar 2008
    Posts
    79

    Default Battery change causes default mode??

    03 gmc 2500HD4x4 LB7 bought used 1 yr ago
    Had a no start today, 5 degrees out and windchill of -15. truck was plugged in for about an hour, but batteries did not have enough juice.
    here is the problem
    Put 2 new matching batteries in, started out to return the cores and could not get more than 2000rpm and check engine came on. Dropped the cores off and on the way home power returned ran like always, but still have a light.
    can't get it scanned till mon, to see what is stored.
    has anyone heard of a problem when disconnecting both batteries at the same time with it going into default and setting a light?

  2. #2
    Join Date
    Mar 2007
    Location
    Pacific Northwest
    Posts
    740

    Default

    I have replaced a few batteries on the DMAX, but never had your problem. Just for grins, disconnect both batteries for 1/2 hour, reconnect and try again. This is not a fix, but may clear the dtc's since you do not have a scanner available to you.
    1998 Chevy k-2500 454 147,000 miles and climbing!

    1993 Pontiac G/A Big Block 3.3 Liter 140,000 miles and still going too!

  3. #3
    Join Date
    Mar 2008
    Posts
    79

    Default

    Just had it out again, light cleared itself. I'll have it scanned Mon and see if it set a code. definitely scratching the head on this one

  4. #4
    Join Date
    Mar 2008
    Posts
    79

    Default

    Finally got a chance to post codes too many

    P0087A fuel rail pressure low (twice)
    P0404 EGR open pintle
    P0650 MIL control circuit
    P0700 TCM MIL request
    U1041 ??
    P1093C Fuel rail pressure out of range
    U1152 ??

    This is the order they were in, would the fuel rail fault be the reason for the default? Don't know why it happened with the battery change

    planning on doing a service to it and changing the fuel filter.

    any ideas?
    Last edited by leolkfrm; 01-25-2009 at 07:48.

  5. #5

    Default

    Purely timing and coincidence...

    Change fuel filter, reset codes, repeat every ~15K miles.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K

  6. #6
    Join Date
    Mar 2008
    Posts
    79

    Default

    Thankyou, I've had just a year and never checked for codes,some may have been there when I bought it! I've put only @5000mi on it, it was supposedly gm certified when i bought it

  7. #7

    Default

    Make sure you clear the codes - after changing the filter.
    2011 Chevrolet Tahoe 5.3L daily driver
    • Previous owner of two 1994 6.5L K3500s, '01, '02, and '05 6.6L K2500s, '04 C4500, '06 K3500 dually, '06 K3500 SRW, '09 K3500HD SRW, '05 Denali
    • Total GM diesel miles to date : ~950K

  8. #8
    Join Date
    Mar 2008
    Posts
    79

    Default

    OOPs maybe cleared the codes when we read it the other day. Not a problem I have acess to the scanner so i'll check after the filter change, just too cold here right now to mess with it

  9. #9
    Join Date
    Aug 2005
    Location
    US
    Posts
    58

    Default

    I just replaced both of my batteries last night on my '03 GMC (original Delco's went 6+ years!!). One of the old bats (right side) had a dead cell, so when I pulled the left side bat, there wasn't enough juice to run keyless and my radio clock reset, even though I was doing one bat at a time to avoid stuff like this. Anyway, I didn't have the problem with the codes that you experienced. My truck was driven to the auto parts place where I did the battery swap in the parking lot. If your truck never started (but cranked slowly) when the old bats were dead, maybe the low voltage caused the codes and it just needed a complete ign. cycle to say 'all is good'?

    BTW, I apparently had a dead cell on the right and a lame left battery for a while because I don't remember the motor ever cranking as fast as it does with the 2 new bats!!

    Unfortunately, new Delco's were $126 ea and new Autolites were $85. Delco's had a 50 month full replacement (compared to 24 mo for the Autolites) but the Delco's overall warranty (pro-rated portion) was a year or so shorter than the autolite. I couldn't justify 50% more $ for the delco's even given the longer full replacement warranty and that the OEM units lasted so long. Hopefully I won't live to regret this.
    ------------------------------------------------------

    Courtesy is free, Respect must be earned.

    ------------------------------------------------------
    2003 GMC CCSB D/A. Stock except for GY LT285/75R16 MTR tires
    Frequently seen tandem-towing a Keystone Laredo 30BH and a 'custom' dirt-bike trailer full of Honda bikes for the family in and around Michigan.

  10. #10
    Join Date
    Mar 2008
    Posts
    79

    Default

    What I realized when changing the batteries is, the dealer I bought it from changed only 1 battery and the otehr was original!
    Bought 2 NAPA 78 month batteries, cold crank at 0 degrees at 900.
    now even my son can not get over how fast it starts

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