P2180System Too Rich Off Idle (Bank 2)
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2180 closes the series: bank 2's long-term trim must remove too much fuel above idle, so its multiplicative adaptation sits at the rich limit. GM's 2005 2.8 and 3.6 V6 and the 2008 3.6 LLT use a factor below 0.78, GM's 2024 tables below 0.77, both over two trips. VW's 2014 Touareg 3.0 TSI hybrid and 3.6 VR6 set it below -30 % on bank 2. Unlike P2190, which reacts to excess fuel at idle such as purge vapour, this code rises with load, so look at fuel delivered per injection: pressure regulator or high-pressure pump control, injectors leaking or over-delivering on bank 2, or a bank 2 front sensor reading rich. When P2178 is set as well, check the air mass reading and fuel pressure first. No bulletin naming this code was found.
- What you may notice
- Check engine lamp on after two trips
- Higher fuel consumption
- Likely causes
- PossibleInjector on bank 2 leaking or over-delivering
- PossibleFuel pressure too high or air mass sensor over-reading, usually with P2178
- RareBank 2 front oxygen sensor reading rich
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Often possible to do yourself.Typical cost: €0 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.