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2001 Yukon Xl With Code P1125

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#1 BobbyC



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Posted 19 April 2010 - 11:28 PM

I have searched previous posts regarding this issue, but I'm in need of an "extra pair of eyes" so to speak.
First, the vehicle in question is a 2001 Yukon XL 1500 with 175,000 miles. It belongs to my friend, a Pastor, who has put his trust in me to get his SUV back in order.

It all started as a "turns over but won't start" problem back in November......
Spark Plugs, Fuel Pump, Fuel Filter, Battery.
Scanned for codes and received messages to replace the following: (which have all been replaced by me)
Mass Air Flow Sensor, Coolant Temp Sensor, Oil Pressure Sensor, Crank Sensor and Camshaft Sensor
By this time I was guessing the Yukon's computer was just throwing out random codes just to aggravate me so I had the Computer replaced (and had it "flashed") and had the alarm system bypassed. The very last thing I replaced was the Pedal Positioning Sensor.
Upon start up after all of this, the dash illuminates "REDUCED ENGINE POWER" so I hooked up the Code Reader and it gave me a P1125 readout. With suggestions from the forum I went and checked the wiring from the PCM, wiring from the Pedal Sensor, cleaned the Throttle Body, re-checked the battery connections, and even changed out the gas cap.

I am now at a loss. Any direction on where I can possibly look now would gratefully be appreciated. (I believe I have mentioned all I have done to it...)
Thanks a million!

#2 thearborbarber



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  • Location:SoDak
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Posted 19 April 2010 - 11:41 PM




2009 GMC Sierra 1500
1999 Chevy Camaro Z28 (Mr. Hyde)
2004 Honda Civic (Dr. Jeckel)