P0175 on Buick
System Too Rich (Bank 2)
P0175 on Buick vehicles indicates system too rich (bank 2). Au7o has documented this code across 1 Buick model — most commonly on Enclave. P0175 is a generic OBD-II code meaning the engine computer detected that the air-fuel mixture on bank 2 is too rich, with too much fuel relative to air. The computer has had to remove fuel (negative fuel trim) to try to correct it but has reached its adjustment limit. Bank 2 is the cylinder bank that does not contain cylinder #1. A persistently rich mixture wastes fuel, causes rough running, and can overheat and damage the catalytic converter over time.
Common Causes of P0175
- •Dirty or faulty mass air flow (MAF) sensor
- •Leaking or stuck-open fuel injector
- •Excessive fuel pressure / faulty fuel pressure regulator
- •Faulty or contaminated oxygen sensor
- •Engine vacuum leak or false air reading
- •Dirty/clogged air filter or restricted intake
- •Leaking fuel injector O-rings or fuel saturation
- •Faulty coolant temperature sensor skewing fuel trims
P0175 on Buick by Model
Buick Enclave(1 issue)
- Cold-Weather PCV Deposits Can Cause Reduced Power (PI0746)2008-2011
GM PI0746 covers 2008-2011 Buick Enclave vehicles with the 3.6L LY7 or LLT engine. After a cold start or low-ambient-temperature driving, condensation can freeze at the throttle-body base while engine vapors, fuel dilution and oil mist collect in the air-inlet duct. The condition can illuminate the MIL and cause poor performance or reduced acceleration.
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View P0175 across all makes →Frequently Asked Questions
What does P0175 mean on Buick?▼
P0175 stands for "System Too Rich (Bank 2)." P0175 is a generic OBD-II code meaning the engine computer detected that the air-fuel mixture on bank 2 is too rich, with too much fuel relative to air. The computer has had to remove fuel (negative fuel trim) to try to correct it but has reached its adjustment limit. Bank 2 is the cylinder bank that does not contain cylinder #1. A persistently rich mixture wastes fuel, causes rough running, and can overheat and damage the catalytic converter over time. On Buick specifically, this code is documented across 1 model.
What causes P0175 on Buick vehicles?▼
Common causes on Buick: Dirty or faulty mass air flow (MAF) sensor, Leaking or stuck-open fuel injector, Excessive fuel pressure / faulty fuel pressure regulator, Faulty or contaminated oxygen sensor, Engine vacuum leak or false air reading. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0175 on a Buick?▼
Repair costs vary widely depending on the root cause and specific Buick model.
Which Buick models have P0175 documented?▼
Au7o has documented P0175 on 1 Buick model: Enclave.