P0AF0 on 2024-2026 GMC Hummer EV SUV — Drive Motor Inverter Temperature Sensor 'A' Circuit High
1 vehicles · 1 makes
How to diagnose and fix P0AF0: most-reported vehicles
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GMC Hummer EV SUV · 2024–2026
Some Hummer EV SUVs experience slower-than-expected DC fast charging speeds and intermittent charge port communication failures. The vehicle's 800V architecture should support 350 kW charging, but software limitations and battery temperature management can reduce speeds significantly. The charge port door actuator can also fail, preventing the port from opening. CCS connector fit issues at some public charging stations cause the vehicle to reject the charge session.
Common Symptoms
- DC fast charging capping at 100-150 kW instead of 350 kW
- Charge port door not opening
- Charging session ending prematurely
- Unable to initiate charging at some stations
- Battery preconditioning not activating before arrival at charger
How to Fix
Pre-condition the battery for DC fast charging by enabling the "target charge station" feature in navigation — this warms the battery to optimal temperature before arrival. Ensure the latest OTA software update is installed, as GM has improved charging algorithms. For charge port door issues, the actuator can be replaced under warranty. Try multiple charger brands if one consistently fails to connect.
Sources for this issue (1)
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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?
P0AF0 stands for "Drive Motor Inverter Temperature Sensor 'A' Circuit High." This hybrid/electric powertrain code sets when the control module sees the signal from the drive motor inverter temperature sensor 'A' circuit above its expected range (typically an open circuit or a short to voltage). The inverter's temperature reading is used to protect the power electronics, so when the module cannot trust it, it may limit electric drive power and illuminate a hybrid/EV warning or check engine light. Diagnose with the factory service information and observe high-voltage safety precautions.
What are the most common causes of P0AF0?
The most common causes of P0AF0 are: Open or high-resistance inverter temperature sensor circuit, Sensor signal circuit shorted to voltage, Failed drive motor inverter temperature sensor (often internal to the inverter/power module), Damaged, loose or corroded inverter connector, Faulty drive motor control module / inverter assembly. 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 1 vehicle models from 1 manufacturers: GMC.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.