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This is more to document for anyone searching the forum for these codes and what was found on my Gen2 2019 Volt.

Unfortunately my car coded with check engine light a week ago Saturday as we were out. I immediately drove it to the dealer and dropped it off at CARR Chevrolet, Beverton, OR. I also received a diagnostic email from OnStar about the time it coded which read:

An issue with the lithium-ion battery in your 2019 Chevrolet Volt has been detected. Please service your vehicle within 7 days.
When I brought the car in, the service manager recommended I get a rental (covered under my B2B warranty) and leave my Volt with them. I picked up the car the next Thursday evening and the issue has been corrected. Below are most of the details from the service invoice (excluding freight charge and rental line items). No line items had prices and the invoice total was $0.00.

Cause:Faulty mass airflow sensor and faulty hot water valve
Correction:4022610 Mass Airflow Sensor
LABOR 1.6 WITH DIAG
LABOR CODE: 4412560 Heater Water Shutoff Valve
LABOR .6 WITH COLLANT FILL
VERIFIED CUSTOMER CONCERN AND USED SCAN TOOL WITH GDS2 AND FOUND CURRENT DTC'S P0096, P0113 P2227 P2229. Document ID: 4177297 and Document ID: 4278267
USED SCAN TOOL WITH GDS2 AND OHM AND VOLT METER AND FOUND FAULTY MASS AIRFLOW SENSOR.
REPLACED MASS AIR FLOW SENSOR. ALSO FOUND CURRENT DTC'S P15C5 AND P26A9 AND USE SI DIAGNOSTIC Document ID: 5081202 AND USED SCAN TOOL WITH GDS2 AND FOUND HOT WATER VALVE FAULTY. REPLACED HOT WATER VALVE AND FILLED COLLANT SYSTEM.

SL
100013529523VALVEYWSC78
100023324767SENSORYWSC78
170012378390COOLANTNWSC78
 
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