2021 Pontiac P0172: What It Means & Is It Safe to Drive?
P0172 on the 2021 Pontiac: System Too Rich (Bank 1). Here's what it means, what usually causes it, what repairs typically cost, and whether it's safe to keep driving.
PowertrainMedium urgency
What this code means
Too much fuel relative to air. O2 sensor detects low oxygen in exhaust; PCM is reducing fuel trim.
Common causes on the 2021 Pontiac
- Faulty MAF or O2 sensor
- Leaking fuel injector(s)
- High fuel pressure
- Faulty purge valve stuck open
Symptoms
- Check Engine Light
- Rich smell, black smoke
- Poor fuel economy
- Rough idle possible
Typical fixes
- Replace MAF or O2 sensor
- Test fuel pressure and injectors
- Replace purge valve if stuck open
Repair cost range
For a 2021 Pontiac, repairs for P0172 typically fall between $100 and $600, depending on the root cause and labor rates in your area.
Known issues on Pontiac
Pontiac Solstice GXP 2.0T turbo P0172 rich Bank 1 often comes from a stuck EVAP purge valve or a boost sensor issue. On the naturally aspirated G6 3.5L, P0172 typically indicates a stuck purge valve solenoid—inspect the purge valve before checking injectors.
Most commonly affected models
Solstice GXP 2.0T 2007–2010G6 3.5L V6 2006–2010