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Old 10-01-2012, 02:00 PM   #1
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Default Computer update on 04 Trailblazer

I was told that sometimes GM have computer updates for your truck. How can i know if there are any updates available for your truck before you take it to a dealership for a charge. Any ideals?
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Old 10-01-2012, 02:22 PM   #2
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Yes, you are correct. Sometimes GM puts out updates just like Microsoft would with there software. If you can read the sticker on your PCM, you will see a long bold #. Now, goto this website, and type in your VIN # and it should tell you if there is an update for your PCM.
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Last time I knew, CAL ID #'* are sequential. If you see a number listed that is higher than yours, than you know there is an update. But this doesn't mean that it is a crucial update that needs to be done.
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Old 10-01-2012, 02:54 PM   #3
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Default What is this telling me?

GM Vehicle Calibration Information



VIN: 1GNDS13S742385394
Controller: PCM/VCM Powertrain/Vehicle Control Module



Calibration History for: Operating system
Part Number CVN Bulletin # Description
12597031 N/A - New software to reduce the potential for setting P0335, P0606, and P0741.
12590965 0000EBB6 - New software to address P1680.
12589825 N/A - New software to enable P2771 diagnostic.
12587608 N/A - Software change to improve performance
12584594 N/A - Operating system

Calibration History for: Engine
Part Number CVN Bulletin # Description
12600286 00009584 - Calibration to address coast down idle roughness and revise cruise control operation with less vehicle speed deviation. Also contains diagnostic enhancements for DTC P0171.
12597034 000055D9 - New calibration to reduce the potential for setting P0335 and P0606.
12596378 00003A2F - New calibration to reduce the potential for setting DTC P0606.
12590969 00001D8E - New calibration contains diagnostic enhancements and improves idle stability.
12589854 00001934 - New calibration to enable P2771 diagnostic.
12588421 00006391 - New calibration to address DTC P0172
12587518 0000D44A - New calibration for start of production
12587105 00002F48 - Engine calibration

Calibration History for: Transmission
Part Number CVN Bulletin # Description
12597046 000081A1 - New calibration to reduce the potential for setting P0335 and P0606.
12593020 0000CBD7 - Improves transmission performance in cold garage shifts and addresses rough 1-2 shift.
12588434 00001F0D - New calibration for transmission shift improvements
12587118 00006146 - New calibration for start of production
12577612 0000D8BA - Transmission calibration

Calibration History for: Speedometer
Part Number CVN Bulletin # Description
12577630 0000CCF9 - Speedometer calibration

Calibration History for: System
Part Number CVN Bulletin # Description
12596423 000052C6 - New calibration to address customer complaint of overheat condition.
12588441 000075E6 - New calibration to correct problem occuring at the assembly plant. Does not address any service issues.
12587260 0000C710 - New calibration for start of production
12587125 0000F060 - System calibration

Calibration History for: Electronic Throttle Control
Part Number CVN Bulletin # Description
12577594 N/A - Electronic Throttle Contro
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Old 10-01-2012, 05:48 PM   #4
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Uh yea...with those many updates, yea, I'd get it updated myself. Print that page out before you goto the dealer to have it done. Just incase they think your a looney.
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Old 11-09-2013, 11:53 PM   #5
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tis will not let me check my vin #
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Old 11-10-2013, 05:39 AM   #6
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What won't let you check your vin #?
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Old 11-10-2013, 10:49 AM   #7
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TIS, the website posted above. I just tried the VIN that was posted already, and was denied. Looks like they may have pulled the plug on this...
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Old 11-10-2013, 12:44 PM   #8
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you should be able to call the dealer with your vin, because if the update was done on your car it would be logged against it in their database
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