P0AF0: Hybrid Battery System Voltage
2 vehicles · 2 makes
Most Reported On
P0AF0 is an OBD-II diagnostic trouble code meaning “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. This code is most commonly reported on 2024-2026 GMC Hummer EV SUV, and 2024-2025 Chevrolet Silverado EV.
Common Causes
Diagnostic Tools
To diagnose P0AF0, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
- Read & clear engine codes
- View freeze frame data
- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
- Repair Reports with verified fixes
- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
- Live data stream & graphing
- AutoVIN for vehicle identification
- Free lifetime updates via Wi-Fi
Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
- Bi-directional control & active tests
- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
As an Amazon Associate, we earn from qualifying purchases. Prices are approximate and may vary.
FAQ
What does P0AF0 mean?
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.
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?
Repair costs vary widely depending on the root cause and vehicle.
Which vehicles are affected by P0AF0?
Au7o has documented P0AF0 across 2 vehicle models from 2 manufacturers: Chevrolet, GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.