Question

I got the engine codes P0171, P0174, and P0220 on my 2003 Chevrolet 2500hd 6.0L V8, what do the engine codes mean?

Answer 1

Hi there,

Both these codes are for a lean fuel mix on bank 1 and 2. What I normally see is a bad mass air flow sensor or low fuel pressure when the issue is on both banks.

Answer 2

P0171 CHEVROLET Code - Fuel Trim System Lean Bank 1
Read more: https://www.autocodes.com/p0171_chevrolet.html

P0174 CHEVROLET Code - Fuel Trim System Lean Bank 2
Read more: https://www.autocodes.com/p0174_chevrolet.html

P0220 CHEVROLET Code - Throttle Position Sensor 2 Circuit
Read more: https://www.autocodes.com/p0220_chevrolet.html