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Thread: Trans Failsafe Prog - L322 V8 ZF 5HP24 DTC P1845

  1. #1
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    Trans Failsafe Prog - L322 V8 ZF 5HP24 DTC P1845

    As the thread title notes, I am getting a Trans Failsafe Prog (TFP) message. When I check with Testbook (T4), it shows P1845 - CAN Bus ABS timeout error (maybe not unreasonable, see below).

    I can't find anything on here, FullFatRR, nor on RangeRovers.net about this fault but an internet search came up with this from the P1845: 2-3 Shift Solenoid Low Voltage OBD-II Trouble Code page

    P1845: 2-3 Shift Solenoid Low Voltage OBD-II Trouble Code
    In order to shift gears, the transmission has to route pressurized transmission fluid down the right channel. To do this, a little electromechanical device called the 2-3 shift solenoid is employed to channel pressurized ATF through the valve body. If a low voltage condition (like a short) is detected, then a P1845 diagnostic trouble code will be stored.

    How Serious is the Code?
    A P1845 DTC is fairly serious, especially since it has to do with the core shifting function of the transmission. Failure to address the problem will result in serious drivability issues, and eventually a nonworking transmission.
    Now for a bit of background:

    RRPhil has previously indicated the order of checking for TFP is:
    • Battery Voltage
      Transfer Case
      Transmission


    This is where it gets murky...

    I replaced the battery a month ago (with the same brand/model Calcium that I've been running for the past few years) but the battery voltage seems a bit low at 12.42 volts after an overnight charge then 30 mins of park lights being switched on. I may have to take it back to the importer for checking.

    My ABS module is (slowly) winging its way to the UK for repair by ACTronics. (it was posted Express post on 20th April but, looking at the tracking information, it doesn't appear to have reached the UK as yet. ) As a result of no ABS module, there is no valid speed available to the transmission nor transfer case. The transfer case won't change range - that may be a function of no ABS signal. T4 reports, when looking at the transfer case, the L322 is doing 319mph, not km/h, when it is stopped! Probably why the transfer case won't change range. T4 doesn't indicate any transfer case errors.

    (Loss of the ABS module affects a lot of stuff - speedo, ABS, odometer, park distance control, cruise control, emergency brake assist, dynamic stability control, hill descent control, air suspension, and who know what else!)

    Because of the all bongs caused by all the above, I have no idea when the Trans Failsafe Prog error started. I only noticed it on Saturday but I'd say less than a week ago. I would have noticed the message even though I wasn't religiously checking the message centre.

    I guess I'm clutching at straws assuming the fault may be a low battery voltage. The T4 error message of CAN Bus timeout doesn't gel with the transmission website statement of low voltage.

    Any comments would be greatly appreciated.
    Last edited by p38arover; 17th May 2021 at 05:40 PM.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



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  2. #2
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    Hey, so you're ripping about with no ABS module connected is that it?

    I would assume that the T4 would have the right code rather than a generic code found on the internet.

    That being said, seems pretty fair that the trans ECU is having a fit with without data from the ABS ECU. Maybe wheel speed etc is offered up by the ABS ECU instead of the main ECU.

    One would assume that the timeout signal is absolutely correct given no ABS module connected, and id go so far as to say stop driving save for something adverse occurring.

    Probably not a lot of help but my thoughts.
    05 L322 Range Rover | BMW M62 4.4 | Cairns Blue
    07 Lexus GS450h | 2GR-FSE Hybrid | Blue Onyx Pearl

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    I was under the impression that it was fine to drive without ABS module... And that it would only affect ABS, suspension, etc, not gearbox.

    I believe the gearbox has an input and output speed sensor and it uses that to shift, etc.

    There might be an issue with the wiring or the shift solenoid, but I believe the shift solenoids rarely go in the 5hp.

    If it's driving fine otherwise, I'd ignore it.

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    p38arover's Avatar
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    This link Multiple faults recorded to a DiagnoseDan video indicates it may all be ABS related.

    My gearbox seems to be changing gears OK.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

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    If it's working fine, I'd ignore it... I'll probably find out tomorrow if I drive it after taking the module out!

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    p38arover's Avatar
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    I'd be interested to hear what happens.

    If you are shipping your unit to the UK, send it via TNT/Fedex or similar. I should have done that. KLR told me they could do that but I elected (foolishly) to use the postal system.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

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    Quote Originally Posted by p38arover View Post
    I'd be interested to hear what happens.

    If you are shipping your unit to the UK, send it via TNT/Fedex or similar. I should have done that. KLR told me they could do that but I elected (foolishly) to use the postal system.
    I'm taking mine to the group in seven hills... Hopefully they can fix it. The drop off and pick up next day is appealing...

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    It might not be relevant but I'm also getting the "Tran is failsafe prog" issue with my car. My problem is in the shifter, in park. If I shift it into neutral, shut it down and wait for the message to clear, then start it back up it runs fine. It's annoying at this stage but not enough to spend money on.
    04 L322 Vogue V8 - Work truck
    07 Freelander 2 TD4 SE - The wifes
    74 Leyland P76 Targa Florio - Aspen Green
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    Previous LRs = 78IIa series - 81, 93, 95 RRC - D2V8

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    p38arover's Avatar
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    Quote Originally Posted by NUTTTR View Post
    I was under the impression that it was fine to drive without ABS module... And that it would only affect ABS, suspension, etc, not gearbox.

    I believe the gearbox has an input and output speed sensor and it uses that to shift, etc.

    Sorry, I missed this earlier. Thanks for that, it may well be the case.

    Quote Originally Posted by FisherX View Post
    It might not be relevant but I'm also getting the "Tran is failsafe prog" issue with my car. My problem is in the shifter, in park. If I shift it into neutral, shut it down and wait for the message to clear, then start it back up it runs fine. It's annoying at this stage but not enough to spend money on.
    If you were nearby, I'd put T4 on your car to read the fault codes for you.
    Ron B.
    VK2OTC

    2003 L322 Range Rover Vogue 4.4 V8 Auto
    2007 Yamaha XJR1300
    Previous: 1983, 1986 RRC; 1995, 1996 P38A; 1995 Disco1; 1984 V8 County 110; Series IIA



    RIP Bucko - Riding on Forever

  10. #10
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    Quote Originally Posted by FisherX View Post
    It might not be relevant but I'm also getting the "Tran is failsafe prog" issue with my car. My problem is in the shifter, in park. If I shift it into neutral, shut it down and wait for the message to clear, then start it back up it runs fine. It's annoying at this stage but not enough to spend money on.
    I agree with reading the codes. I'd have a bet on XYZ switch.

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