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    1. #1
      Join Date
      Nov 2010
      Posts
      251

      T56 reverse lockout problem

      I have an LS2 and t56 in my firebird. I used the PSI harness and ecm that is wired for the reverse lockout. When I try to shift into reverse it is really hard to get in. To the point where the exhaust shop and glass shop couldn’t figure out how to get it into reverse. I have 12v going to the plug and I even tried a new lock out solenoid and that didn’t work either. Any ideas on what do next? Thanks in advance.



    2. #2
      Join Date
      Jul 2006
      Location
      Pensacola, FL
      Posts
      1,263
      Country Flag: United States
      Have you spoken with PSI to help you diagnose? Is your speedo working accurately? Can you actuate the solenoid on the bench?

    3. #3
      Join Date
      Sep 2004
      Location
      Arizona
      Posts
      239
      Check the pins in the connector at the solenoid. I had a similar problem, and found a bad connection to the solenoid. The pins pushed back into the connector housing when the connector was mated. It was weird, when I first started the car, I could get reverse with no problem, but once I got somewhere, I could not get reverse. I then determined if I shut the engine off and restarted it, I could easily get reverse... fixed the connector and it solved the problem.

    4. #4
      Join Date
      Nov 2010
      Posts
      251
      I will check the pins when I get the car back. PSI said it should work if I have 12v to the plug.

    5. #5
      Join Date
      Oct 2014
      Location
      DFW, Texas
      Posts
      422
      Country Flag: United States
      You do have a good ground, right?

      If i remember right, it's usually ground switched and is provided constant 12v power.
      1972 Plymouth 'Cuda - Not LS-swapped, 5.7L Hemi [MS3 Gold Box], T56 Magnum 6-speed - 'Cuda Build Page
      1976 Dodge D100 - Warlock
      2016 Subaru WRX - E30 Tune

    6. #6
      Join Date
      Oct 2018
      Location
      San Jose, CA
      Posts
      523
      I have mine wired to the brake light switch. And you can hear the solenoid click when the brake pedal is pushed
      1971 Camaro - 406 / T56
      2016 Camaro SS convertible
      2018 Colorado 4x4

    7. #7
      Join Date
      Nov 2010
      Posts
      251
      I should be getting the car back tomorrow and hopefully I’ll be able to get it figured out! Thanks for the pointers

    8. #8
      Join Date
      Nov 2010
      Posts
      251
      After another phone call
      To PSI, they looked up my tune. They never enabled the reverse on the computer.

    9. #9
      Join Date
      Feb 2011
      Location
      dallas, tx
      Posts
      1,729
      Country Flag: United States
      It’s a press of the button on hp tuners to activate

    10. #10
      Join Date
      Sep 2013
      Posts
      159
      Country Flag: Finland
      i made own switch for the reverse lock out. Its not good to hook it to the brake lights, it will open every time when you hit the brakes. Solenoid will wear out much faster with that kind of setup. I have push button in under the dash thats barely visible.

    11. #11
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      Quote Originally Posted by timopajala View Post
      i made own switch for the reverse lock out. Its not good to hook it to the brake lights, it will open every time when you hit the brakes. Solenoid will wear out much faster with that kind of setup. I have push button in under the dash thats barely visible.
      Plus, consider if you get on the brakes and want to shift from 6th to 5th...I prefer mine be activated by the ECU, as intended.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    12. #12
      Join Date
      Sep 2013
      Posts
      159
      Country Flag: Finland
      Quote Originally Posted by andrewb70 View Post
      Plus, consider if you get on the brakes and want to shift from 6th to 5th...I prefer mine be activated by the ECU, as intended.

      Andrew
      Auts! you are absolutely right, might get some real damage after that! Activated by ecu or switch to push is the way to go!

    13. #13
      Join Date
      Aug 2012
      Location
      Peoria, AZ
      Posts
      1,758
      Country Flag: United States
      Quote Originally Posted by andrewb70 View Post
      I prefer mine be activated by the ECU, as intended.

      Andrew

      Let me know when you figure out a way to do that with my ECU... :D

      I just recently rewired my lockout from my non-functioning GRC module to the brake pedal switch and I'm LOVING not having to two hand the shifter into reverse any longer. Been like that for 4 years now...
      Lance
      1985 Monte Carlo SS Street Car

    14. #14
      Join Date
      Apr 2001
      Location
      The City of Fountains
      Posts
      15,971
      Country Flag: United States
      Quote Originally Posted by SSLance View Post
      Let me know when you figure out a way to do that with my ECU... :D

      I just recently rewired my lockout from my non-functioning GRC module to the brake pedal switch and I'm LOVING not having to two hand the shifter into reverse any longer. Been like that for 4 years now...
      I have it working on my Dominator. Text me tomorrow.

      Andrew
      1970 GTO Version 3.0
      1967 Cougar build
      GM High-Tech Performance feature
      My YouTube Channel Please Subscribe!
      Instagram @projectgattago
      Dr. EFI
      I deliver what EFI promises.
      Remote Holley EFI tuning.
      Please get in touch if I can be of service.

      "You were the gun, your voice was the trigger, your bravery was the barrel, your eyes were the bullets." ~ Her

    15. #15
      Join Date
      Nov 2010
      Posts
      251
      After taking the car to be tuned, PSI used an ECU from an 07 Silverado (a vehicle that did not offer a manual) and that is the reason why the reverse solenoid will not engage. Not sure what I’m going to do next.

    16. #16
      Join Date
      Jun 2010
      Location
      Deployed
      Posts
      3,280
      Country Flag: United States
      Buy another ECU and transfer the tune over.


      Quote Originally Posted by firebirdzig View Post
      After taking the car to be tuned, PSI used an ECU from an 07 Silverado (a vehicle that did not offer a manual) and that is the reason why the reverse solenoid will not engage. Not sure what I’m going to do next.
      1970 Camaro/DSE build


      Are you driver enough? Maybe....come on blue!
      https://www.pro-touring.com/threads/...71#post1147371

    17. #17
      Join Date
      Dec 2008
      Location
      Detroit
      Posts
      2,584
      Country Flag: United States
      Quote Originally Posted by badazz81z28 View Post
      Buy another ECU and transfer the tune over.
      I thought the tune and ECU had to match. ie the base tune had to be from a manual car that had the same model ECU e38, e40 or e67?
      Big dreams, small pockets....

      Chris--
      '72 Cutlass S LSA/T56 Magnum
      Bowler Performance, Rushforth Wheels, ATS, Holley EFI, KORE3, Ridetech

      Project Motor City Madness

    18. #18
      Join Date
      Jun 2010
      Location
      Deployed
      Posts
      3,280
      Country Flag: United States
      Quote Originally Posted by csouth View Post
      I thought the tune and ECU had to match. ie the base tune had to be from a manual car that had the same model ECU e38, e40 or e67?

      Honestly...I really didn't agree that your current ECU wouldn't work because it was an auto car. What type of ECU is it? E38/E67 etc?


      Did you pin the socket on the harness?


      I could be off base here, but an E67 is an E67....For example I have a E67 for a LS3. I have it running an LS7. Additionally, the GM harness didn't have a wire or a pin for the reverse lock-out and I added it and it works fine.
      1970 Camaro/DSE build


      Are you driver enough? Maybe....come on blue!
      https://www.pro-touring.com/threads/...71#post1147371

    19. #19
      Join Date
      Dec 2008
      Location
      Detroit
      Posts
      2,584
      Country Flag: United States
      Quote Originally Posted by badazz81z28 View Post
      Honestly...I really didn't agree that your current ECU wouldn't work because it was an auto car. What type of ECU is it? E38/E67 etc?


      Did you pin the socket on the harness?


      I could be off base here, but an E67 is an E67....For example I have a E67 for a LS3. I have it running an LS7. Additionally, the GM harness didn't have a wire or a pin for the reverse lock-out and I added it and it works fine.
      I'm not the OP, i was just asking... The LS7 and LS3 both use e67.

      Based on what i see the OP should have an E38 ECU if its from a 2007 Silverado. Assuming he bought both the ECU and harness from PSI, it should be wired for reverse lockout. He could possibly have that ECU overwritten with a base tune from an LS2 Corvette with manual wich i belive had e38 also?
      Big dreams, small pockets....

      Chris--
      '72 Cutlass S LSA/T56 Magnum
      Bowler Performance, Rushforth Wheels, ATS, Holley EFI, KORE3, Ridetech

      Project Motor City Madness

    20. #20
      Join Date
      Oct 2007
      Posts
      1,853
      OK simple fix.. pull the solenoid out.. trim the spring down and reinstall.
      Blog post here.. https://www.grannasracing.com/blogs/...se-lockout-mod
      From a place you will not see comes a sound you will not hear....

      67 Camaro In progress

      https://www.pro-touring.com/showthre...-Tap-67-camaro

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