Thread: Went into Low Engine Power mode

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  1. #1 Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Took a drive to check my brakes, and I lost significant engine power.

    I am seeing codes P0120, P0220, P0404, P1404, P1516 and P2101. I think I also saw an anti-lock brake system message.

    Earlier that day, I replaced front brake pad guide hardware. I mistakenly jacked up the car on splash shield which pushed on the core support. It's bent, but there doesn't seem to be anything else wrong.

    Any wiring harness I checked looked fine, vacuum lines look good...I am stumped.

    Could a bad EGR be setting this all off? I had a similar low power mode when a vacuum tee broke.

    Also, could a shorted wheel speed sensor be triggering a major electrical problem? I have had occasional anti-lock brake hiccups which had me contemplating looking at the wheel speed sensor wires.
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  3. #2 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Sorry, it is a 2005 GTP
    2005 Grand Prix GTP
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  4. #3 Re: Went into Low Engine Power mode 
    GTX Level Member bandook's Avatar
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    By core support, do you mean the oil pan?
    Top Swapped 01 Imp.
    SD Headers, 2.8" pulley, self ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  5. #4 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
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    core support is up higher then the front sub frame, so im thinking he missed the frame and jacked it up via the core support and that can crush a radiator easy.

    not sure if theres a harness under there you might have pinched, cause thats a load of codes.

    if you clear the codes do they all come right back?

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  6. #5 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Yes, the front core support where the radiator is. There are no leaks from the radiator.

    I cleared the codes, and only P1516 came back, immediately. I did not drive it, especially since it is at reduced power mode.


    I don't believe there are any wire harnesses in the area. There is one that sits hon top of the frame, and it does not appear to be touched.

    Also, I had a well experienced Grand Prix enthusiast agree that there isn't any wiring harness below the radiator. He did say there is one above the radiator, but I am not seeing it.
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  7. #6 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
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    the one up top is tucked inside the support, if you take the dog bone mounts off the support you'll find it.

    could be a bad wire at the plug for the tac. P1516 Chevrolet Throttle Actuator Control Module Throttle Actuator Position Performance: Code Meaning, Causes, Symptoms, & Tech Notes or its just went bad.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  8. #7 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    After resetting DTCs, it always has Reduced Engine Power, Traction Control Off and Service Traction System on the information center. P1516 (throttle actuator control position) is always there. P0120 (TPS circuit-A output voltage compared to circuit-B) and P0220 (PCM voltage) has reappeared once.

    I took the splash shield off, and there does not appear to be any wiring. The large harness at the frame are (1) red and (1) black heavy gauge wires, untouched.
    2005 Grand Prix GTP
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  9. #8 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    the one up top is tucked inside the support, if you take the dog bone mounts off the support you'll find it.
    OK, will go do.
    2005 Grand Prix GTP
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  10. #9 Re: Went into Low Engine Power mode 
    Killa Bee Scottydoggs's Avatar
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    dbw can suck, the pedal or the tb might have taken a crap here.

    98 Buick Regal GS, F body brakes, Caddy STS wheels, tinted tails L36 bottom end, lightly ported heads, 1.95 roller rockers, headers, gen 5 N* 3.0 pulley, FSIC, 42 lb injectors, a BrandonHall rebuilt trans, DHP tuned and AEM water/Meth injection https://goo.gl/gpV5kW
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  11. #10 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Quote Originally Posted by LouF View Post
    OK, will go do.
    There are no wiring harnesses high or low. I took out the fans and looked behind radiator and condenser coil to be absolutely sure - nothing. - cleaned lots of grit and grime from the radiator.

    This must be some strange coincidence. I moved the car twice before going on this longer test drive when the malfunction occurred, so that can make sense.
    2005 Grand Prix GTP
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  12. #11 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    dbw can suck, the pedal or the tb might have taken a crap here.
    Sounds possible (read these similar items in other research), but there are so many other parts mentioned. PCM faliure?

    I checked the EGR and it is not stuck; unplugged and replugged the TB connector. Checked various wires for burn or wear since last week I got aggressive on solving an intermittent misfires - everything looks OK. Fuses in underhood fuse box look good. Battery is fully charged/assumed to be good.
    2005 Grand Prix GTP
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  13. #12 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Quote Originally Posted by Scottydoggs View Post
    dbw can suck, the pedal or the tb might have taken a crap here.
    Problem solved. It was a piece of tape that I used around the crankcase ventilation tube elbow at the snorkel that came off and got sucked into the airstream. LUCKILY, it got caught at the throttle plate, OMG. It was preventing the butterfly from going to closed/idle position. Removed it, cleaned the throttle body and did a quasi-relearn process, and back to a normal running engine. That threw everything off !

    Thank you very much for your help!! - the final guess was right at where the issue was, the TPS/throttle body.
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  14. #13 Re: Went into Low Engine Power mode 
    GTX Level Member bandook's Avatar
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    Nice! Scotty is like the rain man of the 3800. He's helped me a ton.
    Top Swapped 01 Imp.
    SD Headers, 2.8" pulley, self ported everything, E85, AEM water/meth, Deka 60's, HPT tuned
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  15. #14 Re: Went into Low Engine Power mode 
    SE Level Member LouF's Avatar
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    Thanks. Yes, I don't think I would have followed through with the TPS; I was sold on a failed PCM. I was about frantic thinking of all the parts that could have been thrown at it.
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