Circuit/System Verification
WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
- Ignition - On / Vehicle - In Service Mode
- Verify there are no DTCs set related to the following system/component: HO2S Heater
- If a related DTC is set
- Go to next step: If a related DTC is not set
- Verify the condition does not exist:
- B52 Heated Oxygen Sensor - Water intrusion @ Harness Connector
- Coolant consumption - Refer to: Loss of Coolant
- Vacuum leak @ Engine/Hoses / Lines
- Oil consumption - Refer to: Oil Consumption Diagnosis
- Evaporative Emission Canister - Saturated with fuel
- Fuel - Contaminated/Poor Quality - Refer to: Alcohol/Contaminants-in-Fuel Diagnosis
- Fuel injectors which do not close completely. - Refer to: Fuel Injector Diagnosis
- Fuel pressure that is too low or too high. - Refer to: Fuel System Diagnosis (Without FPCM) , or Fuel System Diagnosis (FPCM)
- Exhaust System - Leaking/Loose Clamps/Visible Damage - Refer to: Symptoms - Engine Exhaust
- Fuel Injectors Restricted - Refer to: Fuel Injector Diagnosis
- If a condition exists
Repair or replace as necessary.
- Go to next step: If no condition exists
- Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.
Verify the DTC does not set.
- If the DTC sets
Test or replace the component: B52 Heated Oxygen Sensor
- Go to next step: If the DTC is not set
- If the DTC sets
- All OK.