What Does P0172 Mean on Your 2022 Chevrolet Colorado?
When your 2022 Chevrolet Colorado sets a P0172 code, the engine control module is reporting that Bank 1 is running too rich. The 2022 Colorado offers the 2.5L four-cylinder (200 hp) and the 3.6L V6 (308 hp) as gasoline options. On the V6, Bank 1 is the rear bank closest to the firewall. The 2.5L has only one bank.
A rich condition wastes fuel and can damage expensive emissions components. The 2022 is the last year of the previous-generation Colorado, so parts availability is good and repair costs are reasonable.
Common Symptoms You May Notice
- Check engine light illuminated
- Lower fuel economy
- Rough idle
- Black exhaust smoke
- Fuel odor from the tailpipe
- Sluggish acceleration
Top Causes of P0172 on the 2022 Colorado
- Dirty MAF sensor - Contamination causes the MAF to underreport airflow, leading the ECM to inject too much fuel.
- Failing upstream O2 sensor - A degraded Bank 1 oxygen sensor sends bad data for fuel trim corrections.
- Leaking fuel injector - A direct injection injector that does not seal properly delivers excess fuel.
- High fuel pressure - A failing fuel pressure regulator can push too much fuel through the system.
How to Diagnose the Problem
Pull codes and check freeze frame data. Review Bank 1 fuel trims. Negative LTFT past -10% confirms the issue.
Clean the MAF sensor with proper cleaner. Monitor the upstream O2 sensor on Bank 1 with live data. Check fuel pressure at the rail.
Repair Options and Cost Estimates
- MAF sensor cleaning or replacement: Cleaning under $10. New sensor $45-$160 plus $45-$95 labor.
- O2 sensor replacement: Parts $45-$145. Labor $75-$150.
- Fuel injector replacement: Parts $35-$105 per injector. Labor $190-$400.
- Fuel pressure regulator: Parts $40-$110. Labor $90-$220.
Can You Fix This Yourself?
MAF cleaning is easy and recommended as the first step. O2 sensor replacement is moderate difficulty. Fuel injector and pressure regulator work is more advanced.
Prevention Tips
- Replace air filter regularly, especially in dusty work environments
- Use quality fuel
- Run fuel system cleaner every oil change
- Do not ignore check engine lights