GMC P0174 Error Code: How to Fix It

Q: What causes GMC P0174 error code?

P0174 is caused by a lean fuel mixture on Bank 2, typically due to vacuum leaks, dirty MAF sensor, clogged fuel injectors, low fuel pressure, intake manifold gasket leaks, or exhaust leaks before the oxygen sensors.

Q: Can I drive my GMC with P0174 code?

You can drive short distances, but prolonged driving with P0174 can damage your engine due to lean burn conditions. Address the issue promptly to prevent costly engine damage, especially to valves and pistons.

Q: How much does it cost to fix P0174 on a GMC?

Repair costs vary widely depending on the root cause. Simple fixes like air filter replacement cost $15-30, while major repairs like intake manifold gaskets can cost $300-800. Professional diagnosis typically costs $100-150.

Q: Is P0174 the same as P0171?

Both are lean codes, but P0171 affects Bank 1 while P0174 affects Bank 2. If both codes appear together, look for issues affecting the entire fuel system like fuel pump problems or a dirty MAF sensor.

Q: Will P0174 clear itself on GMC vehicles?

The code may temporarily clear if the lean condition stops occurring, but it will return if the underlying problem isn't fixed. The code must be manually cleared with an OBD2 scanner after repairs are completed.

Abstract

GMC error code P0174 indicates that your engine's fuel system is running too lean on Bank 2, meaning there's too much air and not enough fuel in the air-fuel mixture. This can cause poor performance, rough idling, and potential engine damage if left untreated.