P2179 on 2008-2011 Buick Enclave — System Too Lean Off Idle (Bank 2)
1 vehicles · 1 makes
Most Reported On
P2179 is an OBD-II diagnostic trouble code meaning “System Too Lean Off Idle (Bank 2).” The PCM detected that bank 2 (the bank not containing cylinder 1) is running lean during off-idle/cruise conditions, with long-term fuel trims maxed out adding fuel. This code is most commonly reported on 2008-2011 Buick Enclave.
Common Causes
Diagnostic Tools
To diagnose P2179, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
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A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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BlueDriver Pro Bluetooth Scanner
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Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
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LAUNCH CRP123X OBD-II Scanner
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A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
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FAQ
What does P2179 mean?
P2179 stands for "System Too Lean Off Idle (Bank 2)." The PCM detected that bank 2 (the bank not containing cylinder 1) is running lean during off-idle/cruise conditions, with long-term fuel trims maxed out adding fuel.
What are the most common causes of P2179?
The most common causes of P2179 are: Vacuum or intake air leak on bank 2, Weak fuel pump / restricted fuel filter, Dirty or failing MAF sensor, Clogged/leaking injectors, Exhaust leak ahead of bank 2 upstream O2 sensor. The specific cause varies by vehicle.
How much does it cost to fix P2179?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P2179?
Au7o has documented P2179 across 1 vehicle models from 1 manufacturers: Buick.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.