code p2099 keep coming back

[Alex Zambrano]

Hello everyone! I have a 2013 GMC Sierra WT single cab with the 4.3 L V6 170,000 miles. I have a p2099 code that keeps coming back even after replacing ALL OE sensors (GM) I have tested the wiring looked for exhaust leaks and I can't find anything. The truck runs fine. The code comes back like after 250 miles. It started doing it back in January. Any input would be greatly appreciated!

[richard wysong]

Welcome to the forum. What is the code definition? There are over 30,000 possible codes, no one remembers them all and most will skip over your post instead of taking the time to look it up

[carkhz316]

I'm with you that people could do us all a favor and post the code description, but its pretty simple with a cursory internet search:

 

P2099 Post Catalyst Fuel Trim System Too Rich Bank 2

 

A P2099 code means that the post catalytic converter O2 sensor on bank 2 has detected a rich exhaust condition. Fuel efficiency may be compromised and the code should be addressed as severe.

 

Possible causes for this engine code include:

- Faulty bank 2 catalytic converter

- A faulty mass air flow or manifold air pressure sensor

- Defective bank 2 O2 sensor/s

- Burnt, chafed, broken, or disconnected wiring and/or connectors

- Engine exhaust leaks