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Thread: pcm locked tuner will not unlock unless stock.... any advice

  1. #1
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    Default pcm locked tuner will not unlock unless stock.... any advice

    all I know is he tuned it with hp tuners and I need to access these files because hes 1800 miles away and cant tune it correctly. so I bought this program to learn myself but dont want to start at ground zero. which ground zero looks to be where ill have to start. I get a script code $0537 - controller locked with custom key

    truck is a 1999 gmc sierra 2wd
    5.3 with A thunder racing 220/220 -.551/.551 on a 112lsa
    milled 862 heads .032 (stock gaskets)
    long tubes with ORY
    60 lbs injectors
    Mp122HH magnacharged
    8-9 psi of boost I see now

    3200 stall 4L65E trans
    3:73 gears
    295/45/20 tires

    truck has changed since my last signature update fyi

    any help to point me the right way would be great! Im afraid to tune off stock settings and might mess up - just being honest
    99 ECSB 1500 6.0 lq9/243 2wd 3.42 in the works.
    Efans - CAI - Walbro 255lph - Eaton LSD
    BTR STAGE 3 truck cam - 60lb Inj - MP122HH
    FLT Level 5 - 3000 SC YANK
    Pacesetter LT's - ORY
    13.170 @ 103.33 Mph -

  2. #2
    Lifetime Member minytrker's Avatar
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    It was most likely tuned with a 2 bar HPT OS. It will have to be flashed back to stock with HPT and then you can tune it with EFI but you'll have to start over.

  3. #3
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    Quote Originally Posted by minytrker View Post
    It was most likely tuned with a 2 bar HPT OS. It will have to be flashed back to stock with HPT and then you can tune it with EFI but you'll have to start over.
    Thanks for the heads up!!!
    99 ECSB 1500 6.0 lq9/243 2wd 3.42 in the works.
    Efans - CAI - Walbro 255lph - Eaton LSD
    BTR STAGE 3 truck cam - 60lb Inj - MP122HH
    FLT Level 5 - 3000 SC YANK
    Pacesetter LT's - ORY
    13.170 @ 103.33 Mph -

  4. #4
    Joe (Moderator) joecar's Avatar
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    Can you ask the tuner to send you the .hpt file from your PCM...?

  5. #5
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    I can and will- good idea then have someone read it?! I did ask him at one point if I got my hands on a hp tuners would he allow me to make minor adjustments ( gear ratio, tire size ) he said no he can do that and will adjust it when need be- but everytime I ask for something it's a week later he gets to it, then another week goes by before I get it plus paying shipping and handling both ways.
    99 ECSB 1500 6.0 lq9/243 2wd 3.42 in the works.
    Efans - CAI - Walbro 255lph - Eaton LSD
    BTR STAGE 3 truck cam - 60lb Inj - MP122HH
    FLT Level 5 - 3000 SC YANK
    Pacesetter LT's - ORY
    13.170 @ 103.33 Mph -

  6. #6
    Joe (Moderator) joecar's Avatar
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    You can download and install HPT... without their cable it runs in demo mode which allows you to view a tune file.

  7. #7
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    This is what he said - " if i sent the file it won't be compatible.
    i'll need you to send in the pcm, so i can unlock it, then you can read it with efi, then it'll be in the correct format for editing."

    So I'm going to assume it will be a stock tune file.
    99 ECSB 1500 6.0 lq9/243 2wd 3.42 in the works.
    Efans - CAI - Walbro 255lph - Eaton LSD
    BTR STAGE 3 truck cam - 60lb Inj - MP122HH
    FLT Level 5 - 3000 SC YANK
    Pacesetter LT's - ORY
    13.170 @ 103.33 Mph -

  8. #8
    Joe (Moderator) joecar's Avatar
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    So he won't let you have the tune you paid for (in the gasoline world this is not usually the done thing, gasoline tuners usually don't care who sees their work).

  9. #9
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    I'm going to keep trying, I wonder if he could send me another PCM "unlocked" and try it before I'm out of luck with no tune

    Didn't know tunes where big secrets, I only thought they lock it to protect there end if someone adjusts it and try's blaming the original tuner
    99 ECSB 1500 6.0 lq9/243 2wd 3.42 in the works.
    Efans - CAI - Walbro 255lph - Eaton LSD
    BTR STAGE 3 truck cam - 60lb Inj - MP122HH
    FLT Level 5 - 3000 SC YANK
    Pacesetter LT's - ORY
    13.170 @ 103.33 Mph -

  10. #10
    Joe (Moderator) joecar's Avatar
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    Diesel tunes are big secrets.

    Gasoline tuner can compare against his copy of the tune and can instantly see if someone else made any changes.


    He must have your tune file... maybe offer him $50.

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