What Does P0172 Mean on Your 2024 Cadillac Escalade?
A P0172 code on your 2024 Cadillac Escalade indicates the ECM has detected a rich air-fuel mixture on Bank 1. The 2024 Escalade features GM's 6.2-liter naturally aspirated V8 producing 420 hp, paired with a 10-speed automatic. The supercharged 6.2L V8 with 682 hp is available in the Escalade-V. Bank 1 is the driver-side cylinder bank on both engines.
Both engines use a dual fuel injection system with port and direct injection. P0172 means Bank 1 is receiving more fuel than the ideal ratio, hurting efficiency and potentially damaging the catalytic converter.
Symptoms You May Notice
- Check engine light on
- Fuel economy worse than the rated 14/19 mpg (standard) or 10/14 mpg (V)
- Rough idle
- Black exhaust smoke
- Strong fuel smell from the exhaust
- Reduced power or hesitation
- Misfires on Bank 1
Common Causes of P0172 on the 2024 Cadillac Escalade
- Dirty MAF Sensor - Contamination causes the MAF to underreport airflow, leading to over-fueling. This is the most common and cheapest fix.
- EVAP Purge Valve Stuck Open - A well-documented GM issue where the valve continuously feeds fuel vapors into the intake.
- Leaking Fuel Injector - With 16 injectors (8 port + 8 direct), a leaking injector on Bank 1 can cause localized rich running.
- Failing Bank 1 O2 Sensor - A sluggish upstream O2 sensor on Bank 1 causes the ECM to over-correct with extra fuel.
How to Diagnose P0172
- Scan all codes - Check for P0175, EVAP, MAF, and O2 companion codes.
- Review Bank 1 fuel trims - Negative LTFT beyond -10% confirms the rich condition.
- Clean and test the MAF - Best first diagnostic step.
- Test the purge valve - Verify proper operation.
- Monitor Bank 1 O2 sensor - Check response speed and voltage range.
- Test fuel injectors - Check both port and direct injectors on Bank 1.
Repair Options and Cost Breakdown
- MAF Sensor Cleaning - $15-$30 DIY.
- MAF Sensor Replacement - $160-$380 parts and labor.
- EVAP Purge Valve - $90-$240 parts and labor.
- Fuel Injector Replacement - $320-$700 per injector with labor.
- O2 Sensor Replacement - $220-$420 parts and labor.
Most repairs cost $150 to $480. Though the Escalade is a luxury vehicle, the 6.2L V8 shares parts with other GM trucks, keeping costs manageable.
Can You DIY This Repair?
MAF cleaning and purge valve replacement are manageable DIY tasks. The Escalade has a large engine bay with good access. O2 sensor replacement is doable with a sensor socket. Fuel injector work, especially direct injection, should be left to a professional GM technician.
Prevention Tips
- Replace the air filter every 15,000-20,000 miles
- Use quality fuel from top-tier stations
- Add fuel system cleaner every 10,000 miles
- Follow GM maintenance schedule
- Address check engine lights promptly to protect the catalytic converters