P0AF0 on Chevrolet: How to Diagnose & Fix
Hybrid Battery System Voltage
1 Chevrolet model · 1 documented issue
P0AF0 on Chevrolet by model: symptoms, diagnosis and fix
Early Silverado EVs experience intermittent Level 2 charging interruptions where the vehicle stops charging mid-session or fails to initiate charging. The issue is attributed to EVSE communication protocol timing and software bugs in the onboard charging module. DC fast charging is generally unaffected.
Common Symptoms
- Charging stops unexpectedly
- Charge port light flashing red
- Vehicle fails to start charging
- Charging fault message in app
- Reduced charging speed on Level 2
How to Fix
Update the vehicle software to the latest OTA version — GM has released multiple charging-related fixes. Try a different EVSE/charging station to rule out equipment issues. If the problem persists with multiple chargers, the dealer can diagnose the onboard charger module and CCS communication system. A control module reflash typically resolves the issue.
Sources for this issue (1)
P0AF0 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0AF0 mean on a Chevrolet?
P0AF0 stands for "Hybrid Battery System Voltage." This hybrid/electric powertrain code relates to a detected problem in the high-voltage hybrid battery system's voltage monitoring. The vehicle's controller continuously watches the battery pack's voltage to keep it within safe operating limits and to coordinate charging and electric drive. When the measured voltage or the monitoring circuit falls outside expected parameters, the code is set. Because exact definitions vary by manufacturer for codes in this range, it should be diagnosed with the factory service information; expect a hybrid warning light and possibly reduced electric assist. Always observe high-voltage safety precautions when servicing. On Chevrolet it is documented across 1 model: Silverado EV.
What are the most common causes of P0AF0?
The most common causes of P0AF0 are: Weak or degraded hybrid battery cells/modules, Faulty battery voltage sense circuit or sensor, Damaged or corroded high-voltage connectors/wiring, Faulty battery management/control module, Poor cooling causing battery imbalance, Low 12V auxiliary battery affecting module operation, Inverter or related high-voltage component fault. The specific cause varies by vehicle.
How much does it cost to fix P0AF0 on a Chevrolet?
Repair costs vary widely with the root cause and Chevrolet model; each issue on this page carries its own estimate where one is published.
Looking for P0AF0 on a different make?
View P0AF0 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.