Engine power reduced light after much work
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Cadillac SRX First Generation Forum - 2004 - 2009 Discussion, Engine power reduced light after much work in Cadillac SRX Forums; So our cadillac has recently undergone new heads and timing chain. She purrs like a kitten but has zero power. ...
  1. #1
    K9kol is offline Cadillac Owners Member
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    Engine power reduced light after much work

    So our cadillac has recently undergone new heads and timing chain. She purrs like a kitten but has zero power. It does have the engine light on and says "reduced engine power". It's lucky to reach 30 mph. Compression is good however and since we just did all this work oil is perfect. Anyone have any ideas on what the heck is going on? We did the work ourselves and fixing this car has been a nightmare and we keep pouring good money after bad. Any thoughts would be so appreciated. It's an 06 SRX WITH THE 3.6 V6 by the way

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  3. #2
    repnatl is offline Cadillac Owners Enthusiast
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    Throttle body?

  4. #3
    Sheepish is offline Cadillac Owners Fanatic
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    Re: Engine power reduced light after much work

    yea check the connector to the throttle body first I would think.

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    glake89 is offline Cadillac Owners Connoisseur
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    Re: Engine power reduced light after much work

    Find out what codes you have is the first step.
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  6. #5
    1BadCadSTS's Avatar
    1BadCadSTS is offline Cadillac Owners Connoisseur
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    Tb or your off by a tooth on the chains

  7. #6
    conedoctor is offline Cadillac Owners Connoisseur
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    Re: Engine power reduced light after much work

    Quote Originally Posted by 1BadCadSTS View Post
    Tb or your off by a tooth on the chains
    I was thinking that, or an unplugged connector on something, glake89 is right.

  8. #7
    K9kol is offline Cadillac Owners Member
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    Re: Engine power reduced light after much work

    Okay. Got the codes read. I can't remember the exact code but it is saying "low voltage to the throttle body sensor." Is this something we can do ourselves? Unfortunately we have more time than money and lets face it, our Cadillac dealership is condescending and rude. Hate to throw them any more money especially after the lemon they sold us! Thanks!

  9. #8
    glake89's Avatar
    glake89 is offline Cadillac Owners Connoisseur
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    Re: Engine power reduced light after much work

    First 2 tests you can do
    1. a 6 wire connector to TB. Ign. on, engine off. DK-GN wire should be 0.18V; GY should be 5V
    2. turn key off, remove connector at TB. Ign.on, engine off. Set DVM to 400mA scale. measure between GY wire and housing of ECM. should have 50mA.
    Then get back with results.
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  10. #9
    K9kol is offline Cadillac Owners Member
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    Unhappy Re: Engine power reduced light after much work

    No voltage to TB at all. Just replaced it btw. Also have accelerator position sensor code. It barely starts. Idles fine. Does not rev up at all! Worse than before we changed the TB. ANY CLUES?

  11. #10
    repnatl is offline Cadillac Owners Enthusiast
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    Could be that pedal sensor if that is bad it won't send the signal to the tb

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    Re: Engine power reduced light after much work

    K9, need more info. What were the code #s. How and where did you measure for voltage.
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  13. #12
    K9kol is offline Cadillac Owners Member
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    Re: Engine power reduced light after much work

    The codes that were sspit out were the MAF sensor the throttle position sensor as well as the throttlebody low-voltage. Be replaced by new throttlebody as well as the MAF sensor we haven't done the THROTTLE POSITION SENSOR yet. Tested the throttlebody voltage through the wire connecting it to the ECP and no juice whatsoever. At our wits end. The first time we saw the reduced engine power light on was when the heads blew. And we coasted to the side of the road. Wondering what happened then? We had run the car on low oil accidentally of course about two days prior before it died. We were about 3 quarts low. Was certainly acting weird before that for months before though. Any of this making sense?

  14. #13
    glake89's Avatar
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    Re: Engine power reduced light after much work

    K9, The results you post make no sense. First, we need the DTC #s, (MAF sensor could be several codes and by itself, means nothing). No voltage at TB was either measured wrong or the ECM is toast and the car can't run. Chasing a problem by replacing parts is a very expensive way to try to correct a problem. If the car is driveable, get it to a parts store to get the DTC#s so we can help. If it won't drive, at least get a cheap code reader that will give you the #s. Once you do that I would be happy to call you and help you through this.
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