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  1. #1
    Pulling Codes on a C5 Patrick's Avatar
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    Default Pulling Codes on a C5

    I recently had to pull codes on my Z06. Never having done it before, and then interpreting the codes I got, it required going on a bit of a fishing expedition through the "Search Forum" section. This gave me an appreciation for how difficult it can be to track down how to get a code, and how to understand what it means, particularly for those who either haven't done it before, or who aren't familiar with the process in the C5 Generation Corvette.

    So I'm posting this as a resource to anyone new to the C5, or unfamiliar with the process.

    How to Pull Codes:
    1. Turn your key to the "ON" position, but do not start the engine.
    2. Clear any present messages by pressing the RESET button.
    3. Hold the OPTIONS button down, and press the FUEL button 4 times. (This will get you into the "codes" section of the DIC.
    4. The computer will automatically display all the codes your car has created. It will cycle through each code every 3 seconds. (Have a pen and paper handy to write down the codes)

    Note: Any code that ends in an "H" is a history code (something that has occurred in the past, but is not reporting as an error currently.)

    5. Once the computer has finished going through all of its codes, press RESET to enter Manual Configuration mode. It should start with a module and show "NO CODES" or "# Codes."
    6. To optionally reset codes once in manual mode, press and hold RESET until is displays "NO CODES."
    7. Press OPTIONS to go into the next module (ie, from PCM, or Powertrain Control Module, to TCS, or Traction Control System.)
    8. Repeat Step 6 until you have reset all the codes in all the computer modules.

    Note: Only reset the codes if you want to- it is not necessary to reset them every time you pull the codes.

    9. When finished, simply take your key out of the ignition.

    How to Interpret Codes
    Now, once you've pulled the codes (it will usually be a letter followed by four numbers), you can go to THIS SITE to get an interpretation of what they mean.


    -Patrick


    **Edited to insert instructions to enter MANUAL MODE shared in Post#11

    Quote Originally Posted by ZZRider
    Some additional info to supplement Patrick's original post that I found useful:

    H = history (may be a solved or intermittent malfunction)
    C = current

    Manual mode can be entered at any time during the automatic sequence by pressing any button except "E/M"

    Once the DIC displays "manual diagnostics", you may select a particular module by pressing "options" button to go forward or "trip" button to go backwards

    Once a module is displayed and has codes for review, you may view the codes individually by pressing "gages" button to go forward and "fuel" button to go backwards (to review at your own pace and write down)

    To exit the diagnostics mode at any time push "E/M" button
    Last edited by XLR8; 09-12-12 at 08:25 AM. Reason: Edited to insert MANUAL MODE instructions - XLR8
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  2. #2
    The Drakester
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    Thanks, I believe I'll take a look. I'll post what I find.

  3. #3
    schmaltzr
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    When I got my 'vette, I printed out similar instructions and all the codes and put them in my trunk. If I get stuck at least I may know what is going wrong before I call for a tow. - R

  4. #4
    Gone but not forgotten XLR8's Avatar
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    Default TTT

    Good information here... since we have new members and members who've recently acquired a C5, it's worth bumping into action again.

    I printed a copy of these instructions and the C5 Code list and placed them in a notebook in my trunk. I also printed the instructions for resetting the oil life monitor, for those times Chris forgets to reset after he changes the oil.


    For every person with a spark of genius, there are a hundred with ignition trouble.





  5. #5
    New Member Randi's Avatar
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    Default

    Great info - Thank you!

  6. #6
    Roy M. Dudley
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    Patrick,

    Roy Dudley here. Just became a forum member and saw your post re: Pulling Codes. What a great post!! I signed up because I was having issues that your post solved in about 10 minutes. Probably saved me big money at the local Chevy "Stealership". If you ever come to San Francisco I owe you a beer.

    Roy Dudley

  7. #7
    Pulling Codes on a C5 DRTH VTR's Avatar
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    Default

    Quote Originally Posted by Roy M. Dudley
    Patrick,

    Roy Dudley here. Just became a forum member and saw your post re: Pulling Codes. What a great post!! I signed up because I was having issues that your post solved in about 10 minutes. Probably saved me big money at the local Chevy "Stealership". If you ever come to San Francisco I owe you a beer.

    Roy Dudley
    Welcome to the CAC!

    Be sure to check out the tech center: http://www.corvetteactioncenter.com/tech/

    and the knowledgebase: http://www.corvetteactioncenter.com/kb/index.php
    Save the Wave!

  8. #8
    Roy M. Dudley
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    Sounds good! I'll look them over and maybe we'll cross paths again. Thx to everyone for all the help already.

    More to come,

    roy dudley

  9. #9
    Member Pseudomind's Avatar
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    Is there a link to this here somewhere?

    I also printed the instructions for resetting the oil life monitor
    And, remember, using the DIC is one of the things I requested that c4c5Specialist go over at Cruisefest, for many reading about something versus actually doing it are two completely different things.

    Pseudomind is a member of the Jacksonville Corvette Club

    “Spirituality gives hope, religions divide people”

    From a GED to an MBA


  10. #10
    Pulling Codes on a C5 Patrick's Avatar
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    Quote Originally Posted by Roy M. Dudley
    Patrick,

    Roy Dudley here. Just became a forum member and saw your post re: Pulling Codes. What a great post!! I signed up because I was having issues that your post solved in about 10 minutes. Probably saved me big money at the local Chevy "Stealership". If you ever come to San Francisco I owe you a beer.

    Roy Dudley
    Roy,
    You're very welcome! And we're glad you found the CAC- this community is the best resource about Corvettes (historical, technical, production information and in the "what's new" category) on the web.

    I'm glad the post codes proved helpful- I figured it would help many, which is why we made it "sticky." As for the beer, well, you never know. I may just take you up on that, as I have family just down the peninsula from you in Belmont and Woodside.


    -Patrick

  11. #11
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    Very useful post !!

    I had reason to pull codes tonight. Some additional info to supplement Patrick's original post that I found useful:

    H = history (may be a solved or intermittent malfunction)
    C = current

    Manual mode can be entered at any time during the automatic sequence by pressing any button except "E/M"

    Once the DIC displays "manual diagnostics", you may select a particular module by pressing "options" button to go forward or "trip" button to go backwards

    Once a module is displayed and has codes for review, you may view the codes individually by pressing "gages" button to go forward and "fuel" button to go backwards (to review at your own pace and write down)

    To exit the diagnostics mode at any time push "E/M" button

  12. #12
    Pulling Codes on a C5 Eric's Avatar
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    Thanks Patrick for posting this so conveniently!

    Just pulled mine out of curiosity and nothing other than a few H codes regarding the door controls and a couple others. Nothing engine or safety related! (knocking on wood)
    - Eric

    "He is your friend, your partner, your defender, your dog. You are his life, his love, his leader. He will be yours, faithful and true, to the last beat of his heart. You owe it to him to be worthy of such devotion." - Unknown

  13. #13
    QWK C5
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    Default Has anyone seen this code before?

    The following code has been coming up after the check engine light diagnostics and I have no idea what it translates into

    10-PCM P0492 HC

    I would really appreciate anyones experience with this one

  14. #14
    Member Mr. Lucky's Avatar
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    Quote Originally Posted by QWK C5 View Post
    The following code has been coming up after the check engine light diagnostics and I have no idea what it translates into

    10-PCM P0492 HC
    P0492 refers to one of the two secondary AIR Pump systems. The "H C" suffix means that it is both a historical as wel as current condition. This is an emissions item, and the pump only runs for a short time at cold startup. It is probably something you'll want to take care of, but it won't harm the car to drive it with this code.

    There are two air selonoids and shut-off valves which frequently become "frozen" or rusted shut. One is located by the rear of the intake manifold and the other is on the driver side above the exhaust manifold...with a hose going to the air cleaner. Look for any obviously broken or disconnected hoses or connectors. If none found, you might get lucky by disconnecting the hose upstream of the valve and spraying it liberally with penatrating oil or WD40.

    If no joy, here is the official troubleshooting procedure for your 2004.

    GL!

  15. #15
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    Default Thanks Mr. Lucky

    Quote Originally Posted by Mr. Lucky View Post
    P0492 refers to one of the two secondary AIR Pump systems. The "H C" suffix means that it is both a historical as wel as current condition. This is an emissions item, and the pump only runs for a short time at cold startup. It is probably something you'll want to take care of, but it won't harm the car to drive it with this code.

    There are two air selonoids and shut-off valves which frequently become "frozen" or rusted shut. One is located by the rear of the intake manifold and the other is on the driver side above the exhaust manifold...with a hose going to the air cleaner. Look for any obviously broken or disconnected hoses or connectors. If none found, you might get lucky by disconnecting the hose upstream of the valve and spraying it liberally with penatrating oil or WD40.

    If no joy, here is the official troubleshooting procedure for your 2004.


    GL!
    Thanks for the procedure Mr. Lucky. I had the P0492 code with the check engine light. I sprayed WD-40 in the shut-off valve and solved the problem.

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