P0171 Diagnostic Trouble Code Discussion for March 2026
Fuel System Lean (Bank 1)
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| Help Request | Posted | |
| 2013 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNLC2E0XD P0171: Lean bank 1. Came in with complaint of MIL on, some hard to start issues and unstable idle complaints. Found the 2 lean codes, ran the fuel pressure test and it was rapid needle bounce from 45-60 psi. Replace the pump module, stable pressure and no hard start now but s... |
March 04, 2026 | |
| 2012 Chevrolet Suburban 2500 LS 6.0L MIL Lamp on VIN: 1GNWKLEG6C P0171: Lean at idle. This 6.0 at idle will max out the long term fuel trim. Driving the truck the long term is about 21-23 on both banks. Mash the throttle up hill and my 02 sensors go lean and adaptive is at zero. Drive it normally the adaptive is 23-24 and the 02 sensors are... |
March 06, 2026 | |
| 2006 GMC Canyon SLE 2.8L MIL Lamp on VIN: 1GTCS14826 P0171: Fuel System Lean (Bank 1). Engine would not idle with DTC P0171, lean condition. Found MAP sensor cracked at base & leaking vacuum. Replaced MAP sensor with OEM GM part. Idle now good but DTC returned during road test. Data stream showed short term fuel trim at idle fluctuated b... |
March 27, 2026 |
