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    Learner Driver benpearmain283's Avatar
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    P0299 - Underboost issue

    Forum Key Rings
    I don't know if anyone has had a similar issue with the P0299 (turbo underboost) issue. I've changed various sensors, the boost solenoid and intercooler hoses, and cleaned my EGR, turbo and throttle body.

    Finally, I gave in and took it to a garage. They tested everything, including sensors (compared to known working ones), that the turbo and EGR valve are mechanically working, and that there's no leaks (so not intercooler hoses). Everything looked fine to them, so were really scratching their heads. All they could think of is that it could be an ECU issue. They couldn't compare it to the original specs, so suggested I take it to an ECU specialist.

    Has anyone had an underboost issue which led to the ECU? I just wondered if it's a possibility, as it's not any of the obvious causes.

    Also, could the throttle body be a cause, if it doesn't open up fully? This wasn't looked at by the garage, but I do get power every now and then, but lose it as soon as I take my foot off the accelerator and push down again (gear change or when slowing down).

    Any advice would be appreciated.

    Ben

  2. #2
    Racing Driver

    sriray's Avatar
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    Insignia SRi NAV 1.6T Hatchback
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    Quote Originally Posted by benpearmain283 View Post
    I don't know if anyone has had a similar issue with the P0299 (turbo underboost) issue. I've changed various sensors, the boost solenoid and intercooler hoses, and cleaned my EGR, turbo and throttle body.

    Finally, I gave in and took it to a garage. They tested everything, including sensors (compared to known working ones), that the turbo and EGR valve are mechanically working, and that there's no leaks (so not intercooler hoses). Everything looked fine to them, so were really scratching their heads. All they could think of is that it could be an ECU issue. They couldn't compare it to the original specs, so suggested I take it to an ECU specialist.

    Has anyone had an underboost issue which led to the ECU? I just wondered if it's a possibility, as it's not any of the obvious causes.

    Also, could the throttle body be a cause, if it doesn't open up fully? This wasn't looked at by the garage, but I do get power every now and then, but lose it as soon as I take my foot off the accelerator and push down again (gear change or when slowing down).

    Any advice would be appreciated.

    Ben
    Is this a new car to you?

    I have a similar issue when mapping my car, day one was running 18psi, 2 weeks later to confirm the mapping was running 13psi, the mapper even put back on the original map still same 13psi. Only thing he can think off is the factory intercooler is not sufficient enough to cool under heavy boost and the engine is cutting power to protect itself, that's what he thinks anyway, may not be true, but he did have a hard time mapping my car can tell with him up and down between the dyno and his laptop.
    I don't have any fault codes.

    OWNER OF 2012 INSIGNIA SRI NAV HATCHBACK 1.6T

 

 

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