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My 2003 Yukon Denali xl finally gave up on my way home from work. I got the Check Engine and Traction Control Alarms. The Console display was giving the following readouts. Stability System Disabled…… Reduce Engine Power…. Then I was stuck to 15 to 20 miles per hour all the way home. I got home and checked the codes.
Code List:
1. P0171 Fuel System Bank 1
2. P0174 Fuel System Bank 2
3. P0102 Mass Air Flow
4. P1514 MAPP or Mass Air Flow
5. P1516 Throttle Actuator Control
6. P0120 Throttle Position Pedal SensorI replaced the following parts:
1. Mass Air Flow Sensor
2. Throttle Position Sensor
3. Throttle Position Sensor Plug & 12″ of Cable
4. New Battery
5. Relocated the Black wire ground behind the engine and landed it again.
6. Checked all other grounds. – They look good.
7. Pedal Position Sensor
8. Checked all fuses in the fuse control box in the engine compartment.
9. Added new air filter
10. Added fuel treatment.Codes Remaining:
1. P1125 Pedal Position Sensor
2. P0120 Throttle Position Pedal SensorOther Things I’ve done:
1. Gave the computer a hard reset by disconnecting the battery and the holding the +/- leads together.
2. Performed an engine idle retrain.The Reduce Engine Power and Stability System Disabled read-out still comes in right away when I start the engine still. The idle was really high around 1000 but now it’s down around 600 to 700.
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