P0175 on GMC: How to Diagnose & Fix
System Too Rich (Bank 2)
1 GMC model · 1 documented issue · $80-$250 repair
P0175 on GMC by model: symptoms, diagnosis and fix
The fuel pressure regulator diaphragm ruptures, allowing raw fuel to be drawn into the intake manifold through the vacuum line. Causes rich running, hard hot starts, and fuel smell. Can flood the engine with fuel.
Common Symptoms
- Hard starting when hot
- Strong fuel smell
- Black smoke from exhaust
- Fuel in vacuum line to regulator
How to Fix
Replace fuel pressure regulator (ACDelco 217-3071). Check the vacuum line to the regulator - if fuel is present in the line, the diaphragm has failed. Clear fuel from the vacuum line before installing new regulator.
Sources for this issue (1)
P0175 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0175 mean on a GMC?
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 GMC it is documented across 1 model: Jimmy.
What are the most common causes of P0175?
The most common causes of P0175 are: 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. The specific cause varies by vehicle.
How much does it cost to fix P0175 on a GMC?
Published repair estimates on GMC range from $80 to $250 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.