reduced engine power

  1. S

    REDUCED ENGINE POWER. Read below and please help me understand this.

    How do I check CAN BUS on my 2005 z71 Tahoe. I understand how to do it through a 16 pin OBD2 port but have no idea how to do it on my Tahoe due to it only having 4 pins in the OBD2 port. Ima supa confused. It has two grounds, data wire, and power wire or voltage wire. Any help on this is much...
  2. D

    Reduced Engine Power - on startup only

    2003 Yukon, 245k miles, 5.3L 2wd -- I started getting the Reduced Engine Power warning a few years ago not long after I bought this truck used from the 1 previous owner. For a year, I occasionally got the REP warning, maybe once every month or so. Then, it seemed to completely go away this...
  3. P

    Loss of Horse-power with no codes

    I have a 2015 Yukon Denali with the 6.2 and the car seems to drive normal, however whenever the accelerator is really pushed at all its as if nothing happens at all. It is as if there is almost no horsepower. The engine does rev up high but slowly and seems to shift normally. I have an OB2 and...
  4. G

    Reduced Engine power, Service Stability System

    Hello all, I'm new to the group as I purchased a 6.0 2006 Yukon Denali from my dad with a little over 240K on the clock. Don't let the mileage fool you though, this truck as been extremely maintained its entire life and looks as good as if it just came off the show room floor with a couple of...
  5. clemenshess97

    still getting the P0220…

    Hey everybody, last year I had a lot of trouble getting the reduced engine power message. I think it was the P2135 code. I replaced the throttle body, added a few grounds (neg battery pole to TCM to body to throttle body to engine to PCM), cleaned all thenother grounds on the truck and got the...

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