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Thread: "Read vehicle" results in "Engine PWR Reduced" and "Engine Disabled"

  1. #1
    Potential Tuner
    Join Date
    Jan 2020
    Posts
    2

    Question "Read vehicle" results in "Engine PWR Reduced" and "Engine Disabled"

    Hi, new to HPtuners and tuning in general, I have recently connected the MPVI2 interface to my Chevy HHR 2.4 (manual trans) to "read vehicle" with VCM Editor (version 4.4.4).

    Reading actually worked fine (engine was off), but it gave me quite a scare: the Check Engine light came on during reading and the car info display showed "Engine PWR Reduced" and then "Engine Disabled". The engine wouldn't start until I removed the car keys, locked the doors, unlocked the doors and then tried to start the engine again, which fortunately worked.

    Is this known behaviour? Do I have to brace myself for other surprises when writing (haven't tried that yet)?

  2. #2
    Tuner in Training
    Join Date
    Aug 2018
    Location
    Monroeville PA
    Posts
    49
    I have a 2006 Silverado 5.3 and whenever I read or write to the computer, my readout will show service 4WD and the anti lock light light will come on.I am pretty sure after doing anything with the computer you need to remove key and open the door to cycle the computer to off.

  3. #3
    Advanced Tuner mbray01's Avatar
    Join Date
    Dec 2013
    Location
    Pearl River, La.
    Posts
    841
    When the device is reading/writing, a couple things happen, its pulling info over the communication bus, and to do so correctly, it typically sends "hush" messages to other modules, this helps eliminate random bits of info clouding the read/write process. When the hush messages are sent, most module to module communication stops, when it stops, is when these reduced engine power, etc messages pop up. This is normal behavior on a lot of vehicles
    Michael Bray
    Rusty Knuckle Garage
    Slidell, Louisiana
    15yr Master Tech.
    Custom Car Fabrication, Customization, High Performance.
    GM World Class Technician
    Shop Owner

  4. #4
    Potential Tuner
    Join Date
    Jan 2020
    Posts
    2
    Thanks a lot for your answers. Much appreciated!