Thread: P1629 and P1673

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  1. #1 P1629 and P1673 
    Donating Users jacobmh27's Avatar
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    P1673

    Description
    ENGINE HOT LIGHT CONTROL CIRCUIT

    Output Driver Modules (ODM) are used by PCM to turn on
    current-driven devices needed to control various engine and transaxle
    functions. Each ODM can control up to 7 outputs by supplying ground to
    device PCM is commanding on. ODMs can diagnose each circuit
    individually. If ODM output (ENGINE HOT light indicator driver
    circuit) detects an improper voltage level, DTC will set.

    Symptoms
    You likely won't notice any drivability problems.

    Causes

    An improper voltage level has been detected on ENGINE HOT
    light indicator driver circuit.

    Solutions

    Check for shorts or bad connections in ENGINE HOT light
    control circuit.
    Replace fuse.


    P1629

    Description
    THEFT DETERRENT CRANK SIGNAL MALFUNCTION

    Vehicle operation is disabled if incorrect key or starting
    procedure is used. Vehicle Theft Deterrent (VTD) module enables crank
    circuit to starter and sends a signal to PCM if correct key is being
    used. If proper signal does not reach PCM fuel enable signal circuit,
    PCM will not pulse injectors on, disabling vehicle, even if crank
    circuit is by-passed. Signal should be between 40-60 Hz and is
    measured using DC scale on DVOM.

    Symptoms
    Engine will not run

    Causes

    PCM detects incorrect signal on theft deterrent fuel enable
    circuit.

    Solutions

    Check for faulty connection at TDS module.
    Bypass VATs(92-99 only)
    Replace VTD module.


    Are these codes any thing I should worry about. They came up on my aeroforce the other Day I cleared them and they have not come back on. Now I have had a few really cold days where I have used my Remote start and then when I get in the car and put the key in to drive away the Security light stayed on till I shut the car off and used the key to start it. Now I have started my car many times witht the remote start and only twice has the Security light stayed on.
    http://www.cardomain.com/ride/3059486
    2001 GTP, TransGo shift kit, SSAC Headers, AeroForce Scan, TDC Racing FWI, Overkill PCM, 3.4 Pully,MSD Coil Packs, Moroso Wires, AL104's, 160Tstat
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  2. #2 Re: P1629 and P1673 
    Donating Users jacobmh27's Avatar
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    And what is the ENGINE HOT LIGHT CONTROL CIRCUIT
    http://www.cardomain.com/ride/3059486
    2001 GTP, TransGo shift kit, SSAC Headers, AeroForce Scan, TDC Racing FWI, Overkill PCM, 3.4 Pully,MSD Coil Packs, Moroso Wires, AL104's, 160Tstat
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  3. #3 Re: P1629 and P1673 
    Donating Users jacobmh27's Avatar
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    any one have any info on these??
    http://www.cardomain.com/ride/3059486
    2001 GTP, TransGo shift kit, SSAC Headers, AeroForce Scan, TDC Racing FWI, Overkill PCM, 3.4 Pully,MSD Coil Packs, Moroso Wires, AL104's, 160Tstat
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  4. #4 Re: P1629 and P1673 
    Turbo is the way to go. BillBoost37's Avatar
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    You posted the info about them. When was the last time the car started then stalled?
    I drink..so consider that when reading my posts.

    2010 Audi A6 Dual IC's
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  5. #5 Re: P1629 and P1673 
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    So how do you fix the p1673 code need help I have this code 99 grand prix gt
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  6. #6 Re: P1629 and P1673 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by fomas View Post
    So how do you fix the p1673 code need help I have this code 99 grand prix gt
    When you cycle the key, does the "Engine Hot" or "Overheat" (or whatever the warning light for over temp says) light up during the bulb check?
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  7. #7 Re: P1629 and P1673 
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    It sounds like an issue with the after-market remote start. These need to override anti-theft systems since the security chip in the key won't be present when you start the car remotely. I'd be checking the remote start unit. It may be failing or may have a loose connection.
    '01 Grand Prix GTP Special Edition
    Trying to stay pretty close to stock now. Just a few bolt-ons for fun.
    Trying to keep it alive, pretty, and fun.
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  8. #8 Re: P1629 and P1673 
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    Quote Originally Posted by BrandonHall10 View Post
    When you cycle the key, does the "Engine Hot" or "Overheat" (or whatever the warning light for over temp says) light up during the bulb check?
    No everything seems fine runs at the right temp 180 thermostat installed.
    there is no over heat warning light just the gauge.
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  9. #9 Re: P1629 and P1673 
    Solving problems BrandonHall10's Avatar
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    Quote Originally Posted by fomas View Post
    No everything seems fine runs at the right temp 180 thermostat installed.
    there is no over heat warning light just the gauge.
    I think we're talking past each other. I just did some reading on the Google. *IF* I'm understanding the code set criteria correctly, the code has nothing to do with the actual engine temperature.

    It is there to warn you that your "Idiot light" in the instrument cluster is malfunctioning. I assume they have a code just for this because nobody pays attention to the actual temp gauge.

    This is why I asked very specifically if the warning light illuminates during the "bulb check" when you start the car.
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  10. #10 Re: P1629 and P1673 
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    I dont think there is a warning light for over heating. There is a low coolant light check engine light but no over heating light. As far as I can tell they all work none
    are unlimited .
    Last edited by fomas; 09-05-2024 at 08:54 PM.
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