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  1. #1

    Angry Possible Passlock Security system Weekly Problem

    Hey guys,
    Iím new to the forums here, but I am looking for help with my beloved truck. I have a 1998 Chevy K1500 Z71 with 169XXX miles. About a year ago my key began to wear out, so I had the ignition lock cylinder replaced. Not immediately but soon after I began to have problems. It began to intimately not start. The symptoms were the fuel system would cut off immediately after starting, and the security light would began to 5 times and then shut off. The truck would not start for a short period of time, but it seemed to start after i let it set for 30min. I was told it was the pass lock system and Chevy mechanics have told me to replace the pass lock sensor in the ignition cylinder, the PCM (pass lock control module), and have the system re-flashed. None of these items worked at fixing the problem. I tried to do a lot of research on this, but it seems that none of their methods have corrected the issue. I am looking to see if anyone here would have some insight to why the truck is killing the fuel pump and locking the ecu for a period of time.
    Thanks for your time and interest,
    J. Myles Gardner
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  2. #2

    Default

    bump^^

    If you need me to provide any more info please let me know, I have been to multiple gm dealers and 2 master mechanics have been unable to help with this problem. I would love to keep this truck and get it fixed instead of selling it.
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  3. #3

    Default

    Welcome to the fourm! and this is a strange issue ive never heard of. you might have to have the ecu/computer reset to factory standards if you can have a professional do that. other than that i have no idea. sorry man
    1994 Silverado Z71 1500 4x4
    BF Goodrich 31in All-Terrain Tires
    Painted frame-arms-axle
    Blazer Fog lights
    Removed front splash guard
    Tow hook Chains
    Locking gas cap
    REFLEXXION Rear bumper (Painted black)
    Diamond metal bed caps & Truck Box
    Painted engine bay
    Vinyl Flooring
    Bed insert
    Blistein Shock absorbers
    BOSS bluetooth LCD Radio
    Platinum trucker CB antenna
    Midland 5001z CB Radio
    XO backup camera
    X-press Remote entry-alarm
    CUSTOM metal gas & brake pedal
    Highland fold-away bed cleats
    Race thermostat

  4. #4

    Default

    Thanks Shadow, I have had the ECU re-flased by the local dealer, but problem still persisted. I have been putting a bit of money into this truck, and I want this problem to stop stranding me for hours at a time, god knows where.

    Tomorrow I am having a new security/remote start installed on the truck, I have discussed this with the tech and have decided that I am going to have a passlock bypass done, hopefully this will work.
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  5. #5
    Legend
    TRPLXL2's Avatar
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    Norwalk, Ohio
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    Default

    The bypass will work!!

    I did one on an engine swap on a 97' firebird, the VATS or passlock would tell the car to give no fuel and the car wouldn't start for three minutes and the security light would flash. I didn't have to reflash the computer or anything, I looked up the wiring diagram for the steering column and found it. There was two white 22ga wires under the steering colum, that had orange shrink wrap on them. I snipped the two wires, and on the side coming from the ECM I wired in a resistor that matched the pellet value of the key. It cost me about $0.2 to do myself, my honest opinion is the dealer scammed you out of a good buck for the "reflashing" The theftlock works off the BCM anyways, NOT the PCM(ECM)

  6. #6

    Default

    Cool, that is awesome to hear. I have read its a simple job after you find the ohms resistance coming from the passlock, and splice a resistor in. I guess I will soon see if it works.



    Quote Originally Posted by TRPLXL2 View Post
    The bypass will work!!

    I did one on an engine swap on a 97' firebird, the VATS or passlock would tell the car to give no fuel and the car wouldn't start for three minutes and the security light would flash. I didn't have to reflash the computer or anything, I looked up the wiring diagram for the steering column and found it. There was two white 22ga wires under the steering colum, that had orange shrink wrap on them. I snipped the two wires, and on the side coming from the ECM I wired in a resistor that matched the pellet value of the key. It cost me about $0.2 to do myself, my honest opinion is the dealer scammed you out of a good buck for the "reflashing" The theftlock works off the BCM anyways, NOT the PCM(ECM)
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  7. #7

    Default

    Just as an update: The bypass seems to be working, the resistor need was a 2.62kOhms. I will see over the next few weeks if it was 100% successful.
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  8. #8
    Legend
    TRPLXL2's Avatar
    Join Date
    Jan 2009
    Location
    Norwalk, Ohio
    Posts
    3,359
    Blog Entries
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    Default

    I am so glad to hear that, I just wish you would have found out sooner but we all learn some how. It took me 3 seperate attemtps to get mine to bypass correctly, because there is only a 5% tolerance up or down with that. Mine was like 0.519, which made it a combination of 2 resistors which is hard to solder under the dash LOL! Thanks for updating!

  9. #9

    Default

    Crap, well I hope this is within the tolerance range, the closes the tech could get was a 2.7kOhms. Either way Ill let everyone here on this thread know.
    Thanks for the help guys.
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

  10. #10

    Default

    TRPLXL2, how long did it take for you to find out that you didnt have the correct resistor in there? was it with in a week or so?
    Thanks,
    J. Myles Gardner

    1998 Chevy K1500 Z71
    LT285/70R17 Hankook Dynapro ATM- 33"
    Monroe Reflex Shocks
    Rear Air Shock Helpers
    CLIFFORD 3.3X Security with Remote Start and PASSLOCK BYPASS:happy:
    Diamond Plate Toolbox
    Adaptive One Brakes
    :sign0144:

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