Question about 2005 Cadillac SRX

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Most of the time, when i start the car the TC light comes one and then the battery light comes on and a message pops up that says Engine Power Reduced and the car goes into idle. Other times it starts up fine but when your driving the lights and message pops up again and the car shuts off/ goes into idle. we have replaced the TPS (?) sensor which we thought would fix the problem but it continues...we need help!

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  • snoverby Aug 24, 2010

    I'm not sure if these are the code you need but i got them from advance auto
    they said it had to do with the throttle sensor but we just replaced it so i don't know whats goin on... i guess i'm gonna have to kiss my money goodbye and just take it to the dealer, which has already screwed us over once!



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  • Master
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HI. This will be an electrical issue with the engine CPU. You are essentially flying blind without the codes that are present and they need to be extracted with a proper GM certified scan tool device. The TC(traction control) light and Battery light are a strong indication of a weak battery or TCM module damage. That will be the first initial diagnosis, but with that said; Your engine CPU is actually initiating limp mode as well. This will occur if there are major sensor malfunctions present within the engine assembly. Limp mode is basically triggered when these symptoms exist with this particular vehicle. It is induced to protect the engine from further damage. It will shutdown certain cylinders down to reduce HP.

This vehicle will need the services of a competent mechanics or a certified GM dealership. The codes must be pulled, asap. If you have the codes now, please post them so that i may analyze them and provide proper direction.

Posted on Aug 20, 2010

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  • Michael Masters
    Michael Masters Aug 24, 2010

    Hi again; I will analyze the codes an return shortly with my findings.

    One moment please...

  • Michael Masters
    Michael Masters Aug 24, 2010

    Ok, I cant understand why the mechanic did not pick this up, but here is basically the issue here. This is a Electronic Throttle Control System fault. The Electric Throttle Control System (ETCS) is composed of a throttle motor that operates the throttle valve,a throttle position sensor that detects the opening angle of the throttle valve, an accelerator pedal position sensor that detects the accelerator pedal position, and the ECM(Engine Computer) that controls the ETCS system.The ECM operates the throttle motor to position the throttle valve for proper response to driver inputs.The throttle position sensor, mounted on the throttle body, detects the opening angle of the throttle valve and provides this signal to the ECM so that the ECM can regulate the throttle motor. The actual motor could be the culprit, but intensive testing will be needed to rule out any ECM issues, as well as, any broken wiring t the throttle body and sensors that make up the assembly. In a worst case scenario, you will need to replace the entire throttle body. I recommend to take your vehicle to a certified competent Cadillac service station. The ECM circuits must be tested along with the throttle sensor(s) harnesses and connectors for shorts and grounding issues. This is the reason for the limp mode. The ECM cant regulate the throttle body properly. The TPS is fine. this is more serious and will encompass the entire throttle body assembly and ETCS system. The ignition switch should be tested for over voltage as well.

  • Michael Masters
    Michael Masters Aug 24, 2010

    The dealer will probably try to replace the engine computer. This is
    common practice and very expensive. It is rarely the CPU, but they will
    replace it first. If they have competent techs on hand, they should test
    the motor and throttle body components to be sure of the integrity of
    the TB motor and its supporting sensors. I suspect that the TB motor has a
    very serious short in it or the wiring at the TB has shorted or broken
    into fragments, slightly connected but loose and inducing interment



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