Chevrolet P1AF0: Drive Motor 1 Control Module Hybrid Battery Voltage System Isolation Lost

What Does The Chevrolet P1AF0 Code Mean?

This code indicates that the ratio between Mid-Pack Voltage and hybrid battery high voltage is less than 0.27 or greater than 1.80 OR Mid-Pack Voltage is less than 35 V or greater than 975 V. Either above condition exists for 5 seconds.

Conditions for setting the DTC:

• The high voltage contactor relays are closed.
• High voltage is greater than 50 V. Ignition voltage is 8-18 V.
• DTCs P1AEE, P1AF4, and P1AF5 are not set.

Recommended Parts

Below are some recommended auto parts to help you address the trouble code affecting your vehicle and get it running smoothly again:

>>> WORKPRO 582-piece Crimp Terminals, Wire Connectors, Heat Shrink Tube, Electrical Repair Kit
>>> GM Genuine Parts Battery Energy Control Module (Programming Required By Automotive Professional)

Note: During the purchasing process, please check carefully whether the part you want to buy fits your car!

Reference Sources

• Chevrolet Volt Hybrid DTC – OBDG01 HYBRID Diagnostics Document, page 678.
• GM, 2013, Service Bullettin – Service Update for Inventory Vehicles Only
  Loss of Battery Charge – Inspect Generator Control Module.
• GM, 2013, Service Bullettin – Service Update for Inventory Vehicles Only
  Loss of Battery Charge – Inspect Generator Control Module.
• GM, 2013, Service Bullettin – Service Update for Inventory Vehicles Only
  Loss of Battery Charge – Inspect Generator Control Module.
• GM, 2013, Service Bullettin – Loss of Battery Charge – Inspect Generator Control Module.
• GM, 2019, Service Bullettin – PIC6285C Diagnostic Aid for DTCs P1AEE and P1AEF, Control Module
  Hybrid/EV Battery System Voltage High Voltage (Over-Voltage).
• GM, 2019, Service Bullettin – PIC6244D Diagnostic Aid For Vehicles All DTCs P1AEE P1AEF P1AF0
  P1AF2 P1E22.</li