Hi there,
The P1550 code indicates an issue with the stepper motor cruise control. Here is a list of possible causes.
P1550 CHEVROLET - Stepper Motor Cruise Control Fault Read more: https://www.autocodes.com/p1550_chevrolet.html
The P1120 code indicates an issue with the throttle position sensor. Here is a list of possible causes.
P1120 CHEVROLET - Throttle Position Sensor 1 Circuit Read more: https://www.autocodes.com/p1120_chevrolet.html
33.7k questions
32.5k answers
1.3k comments
23.0k users