What Does P0172 Mean on Your 2022 GMC Canyon?
A P0172 code on your 2022 GMC Canyon means the engine control module has detected a rich fuel condition on Bank 1. The 2022 Canyon (1st generation refresh) is available with the 3.6L LGZ V6 (308 hp) or the 2.5L LCV four-cylinder. The 2.8L Duramax diesel is also available but won't set this code. On the V6, Bank 1 is typically the rear bank (cylinders 1, 3, 5).
A rich condition on the Canyon reduces fuel efficiency and can eventually damage emissions components. The good news is that the common causes are well-known and affordable to fix.
Symptoms You Might Notice
- Check engine light on
- Decreased fuel economy
- Rough idle
- Black exhaust smoke
- Fuel smell from the exhaust
- Slight hesitation on acceleration
Common Causes of P0172 on the 2022 GMC Canyon
- Dirty MAF Sensor — Truck environments expose the MAF sensor to dust and debris, causing contamination and inaccurate airflow readings.
- Stuck-Open EVAP Purge Valve — A common GM issue across all models. The purge solenoid sticks open and feeds excess vapors into the intake.
- Failing Upstream O2 Sensor — A degraded Bank 1 Sensor 1 provides incorrect exhaust readings to the ECM.
- Leaking Fuel Injector — Injector seal degradation on the 3.6L V6 can allow fuel seepage.
How to Diagnose the Problem
- Read all codes — Check for P0175 (Bank 2 rich) and related sensor codes.
- Analyze fuel trims — Compare Bank 1 and Bank 2 LTFT values on the V6.
- Test MAF sensor — Verify readings against GM specs.
- Test purge valve — Bidirectional scan tool control test.
- Monitor O2 sensor — Check for proper switching and response time.
- Test fuel injectors — Cylinder balance or flow test.
Repair Options and Cost Estimates
- MAF Sensor Cleaning — DIY: $10-$15. Shop: $55-$110.
- MAF Sensor Replacement — Parts: $70-$170, labor: $55-$110. Total: $125-$280.
- Purge Valve Replacement — Parts: $20-$55, labor: $55-$110. Total: $75-$165.
- O2 Sensor Replacement — Parts: $70-$180, labor: $80-$160. Total: $150-$340.
- Fuel Injector Replacement — Parts: $45-$130 each, labor: $180-$350. Total: $225-$480.
Can You Fix This Yourself?
MAF sensor cleaning is a quick and easy DIY job on the Canyon. The purge valve is also accessible. O2 sensor work requires getting under the truck. Injector work on the 3.6L V6 is more involved due to the intake manifold but is doable for experienced DIYers.
Prevention Tips
- Replace the air filter regularly, especially for off-road or dusty driving
- Avoid oiled aftermarket air filters
- Use Top Tier gasoline
- Follow GM's maintenance schedule