What Does P0172 Mean on Your 2024 GMC Yukon?
A P0172 code on your 2024 GMC Yukon means the engine control module has detected an overly rich fuel mixture on Bank 1. The 2024 Yukon features the 5.3L L84 V8 or the 6.2L L87 V8, both with direct injection and Dynamic Fuel Management. Bank 1 is the driver's side bank of cylinders.
Since the 2024 Yukon is a brand-new vehicle, this code is rare and should be fully covered under GM's factory warranty. Don't hesitate to bring it to your dealer.
Symptoms You Might Notice
- Check engine light activated
- Reduced fuel economy
- Rough idle
- Black smoke from the exhaust
- Fuel smell at the tailpipe
- DFM system may not engage properly
Common Causes of P0172 on the 2024 GMC Yukon
- MAF Sensor Contamination — An aftermarket oiled air filter or manufacturing residue can dirty the MAF sensor, even on a brand-new vehicle.
- Defective EVAP Purge Valve — A known weak point in GM's parts supply. A faulty purge solenoid from the factory can stick open.
- O2 Sensor Manufacturing Defect — While rare, a factory-defective upstream O2 sensor can misreport exhaust composition.
- Fuel Injector Defect — A factory injector with a sealing issue that allows fuel leakage.
How to Diagnose the Problem
- Read all DTCs — Look for related codes that narrow the diagnosis.
- Check fuel trim data — Negative LTFT on Bank 1 confirms the rich condition.
- Test MAF sensor — Verify readings match GM's specs for the installed engine.
- Test purge valve — Bidirectional scan tool test.
- Monitor O2 sensor — Check for proper voltage switching.
- Test fuel system — Pressure and injector diagnostics.
Repair Options and Cost Estimates
Your 2024 Yukon is covered by GM's 3-year/36,000-mile bumper-to-bumper warranty and 5-year/60,000-mile powertrain warranty. All repairs should be free at the dealer.
- MAF Sensor Cleaning — DIY: $10-$15. Shop: $65-$130.
- MAF Sensor Replacement — Parts: $85-$200, labor: $65-$130. Total: $150-$330.
- Purge Valve Replacement — Parts: $25-$70, labor: $65-$130. Total: $90-$200.
- O2 Sensor Replacement — Parts: $90-$215, labor: $100-$190. Total: $190-$405.
- Fuel Injector Replacement — Parts: $65-$180, labor: $260-$475. Total: $325-$655.
Can You Fix This Yourself?
Since warranty covers this, take it to the dealer. The only DIY step worth trying is MAF sensor cleaning, which won't affect your warranty. Everything else should go through the dealer on a new $60,000+ SUV.
Prevention Tips
- Use only OEM or quality dry air filters
- Follow GM's maintenance schedule
- Use Top Tier gasoline
- Report any drivability issues to the dealer promptly while under warranty