Chevrolet code
P0171: on a Chevrolet
How much to fix P0171 on a Chevrolet? Typically $90 to $460 for vacuum leak repair, the most common fix. This is an estimate, not a quote.
On a Chevrolet, P0171 often comes with a stumble at idle or on cold starts. GM engines have a few well-known air leaks, so a shop that knows the model can usually find it faster than a general guess.
General meaning of P0171: The computer keeps adding extra fuel to make up for something, and it has reached its limit on the side with cylinder 1. This is called running lean, and it usually means unmetered air is sneaking in or fuel is not getting through. See the full P0171 page.
Models to know about
| Model | Years | What to know |
|---|---|---|
| Silverado 1500 | 2007 to 2018 | The 5.3 and 4.8 truck engines hit this when the intake plenum or injector O-rings leak. |
| Equinox | 2010 to 2017 | The 2.4 and 3.6 engines often set it with a leaking PCV system. |
| Malibu | 2008 to 2015 | The 2.4 four-cylinder is the common one, with intake and PCV hoses. |
| Tahoe | 2007 to 2020 | Same engine family as the Silverado, same weak spots. |
Common causes on a Chevrolet
- Cracked PCV hose or a worn PCV valve cover on the 2.4 four-cylinder. This is a common repeat cause on Equinox and Malibu.
- Intake manifold gasket or throttle body gasket leaking on the 5.3 and 6.2 V8s once the engine has a lot of miles.
- Dirty mass airflow sensor, especially on trucks that run oily air filters or have a big aftermarket intake.
- A fuel pressure problem, such as a weak pump or a clogged filter in the pump module, on higher-mileage trucks.
NHTSA's public complaint file shows how owners describe this kind of trouble: the 2013 Chevrolet Equinox has 751 complaints on file, and 126 of them use wording like check engine, lean, P0171, rough idle; the 2012 Chevrolet Silverado 1500 has 284 complaints on file, and 12 of them use wording like check engine, lean, P0171, rough idle. Complaints are owner reports, not proof of a cause.
Check this first
- Spray-free check: pull the PCV hose at the valve cover and look for cracks and oil soak at the ends.
- Ask the shop to read the fuel trims at idle and at 2,500 rpm. A trim that gets worse at idle points to an air leak.
- If you changed the air filter or added an intake recently, check that the sensor connector is seated.
Wide range: this job varies a lot. Itemize your quote for a better answer.
How this range is built
| Part of the job | Low | High |
|---|---|---|
| Parts | $5 | $60 |
| Labor: 0.8 to 2.5 hours × $110 to $150 an hour | $88 | $375 |
| Fees: shop supplies, disposal, diagnostics | $0 | $25 |
| Total, rounded | $90 | $460 |
The hourly rate is the BLS Occupational Employment and Wage Statistics, May 2025 average pay for this trade in the US, $27.13 an hour, times 4 to 5.5 to cover what a shop bills (overhead, tools, insurance, profit). Parts are a band from budget aftermarket to the manufacturer part. Full method.
Not a repair shop, estimates only. Typical range, estimate. Not a quote. Your car, parts and shop change the number.
GM parts are easy to find and aftermarket quality is fine for hoses, gaskets and sensors. The expensive risk is the intake manifold gasket on V8 trucks, which is mostly labor.
Other repairs that may be involved
| Repair | Typical range, US |
|---|---|
| Vacuum leak repair | $90 to $460 |
| PCV valve replacement | $65 to $220 |
| Mass airflow sensor replacement | $120 to $390 |
Questions to ask the shop
- Is the leak confirmed with smoke, or are you replacing parts to see what works?
- If it is the PCV system, is the valve cover part of the repair?
- What are the fuel trims after the repair?
Got a quote already? Check it against the range. Wondering if a recall touches this problem? See Chevrolet recalls by model or check a VIN.
P0171 on a Chevrolet: questions
Can I keep driving my Chevy with P0171?
Short term, yes, if it runs smoothly. If it starts to misfire or flash the light, stop and get it checked.
Why does it come back after I clear it?
Because the cause is still there. Clearing a code does not fix a leak.
How much does it cost to fix P0171 on a Chevrolet?
The most common fix, vacuum leak repair, has a typical range of $90 to $460 across the US. That is an estimate built from parts prices and local labor wages, not a quote. Your model, engine and shop move it.
P0171 on other makes
Sources
- NHTSA complaints, 2013 Chevrolet Equinox
- NHTSA complaints, 2012 Chevrolet Silverado 1500
- NHTSA recall lookup by VIN
Written from public NHTSA data, owner-reported patterns and general repair knowledge, in our own words. Model lists are examples, not a full list, and patterns are not a diagnosis. Prices updated October 2026. Not a repair shop, estimates only.