Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2018 GMC Yukon XL, 2018 GMC Yukon, 2018 Chevrolet Tahoe, 2018 Chevrolet Suburban, and 2018 Cadillac Escalade ESV. However, it is still accessible from the selected car via links, so may be relevant.
Verify none of the conditions listed below exist:
P2096 or P2098
- Air intake duct collapsed or restricted.
- Air filter dirty or restricted.
- Contamination of the mass air flow sensor with oil or other foreign material
- Objects blocking the throttle body.
- Excessive fuel in the crankcase. Change engine oil as necessary.
- Rich fuel injectors. Refer to Fuel Injector Diagnosis .
- Excessive fuel system pressure. Refer to Fuel System Diagnosis .
- Fuel contamination. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Fuel saturation of the evaporative emissions (EVAP) canister.
- Stuck open or leaking EVAP purge valve.
- Restricted exhaust. Refer to Symptoms - Engine Exhaust .
- Improper operation of the crankcase ventilation system.
P2097 or P2099
- Exhaust system leaks. Refer to Symptoms - Engine Exhaust .
- Split, kinked or improperly connected vacuum hoses.
- Contamination of the mass air flow sensor with oil or other foreign material
- Insufficient fuel in the tank.
- Leaks in the air induction system and air intake ducts.
- Missing air filter element.
- Cracked evaporative canister.
- Evaporative pipes plugged, obstructed, or leaking.
- Crankcase ventilation system leaking.
- Engine vacuum leaks.
- Low fuel system pressure. Refer to Fuel System Diagnosis .
- Contaminated fuel. Refer to Alcohol/Contaminants-in-Fuel Diagnosis .
- Lean fuel injectors. Refer to Fuel Injector Diagnosis .
- If a condition is found
Repair as necessary.