Engine-Codes - Generic - P0A85

P0A85 - Hybrid Battery Pack Cooling Fan 1 Control Circuit High

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

P0A85 Possible Causes

  • Faulty Battery Cooling Blower Assembly
  • Battery Cooling Blower Assembly harness is open or shorted
  • Battery Cooling Blower Assembly circuit poor electrical connection
  • Faculty Integration relay
  • Faculty Battery smart unit
  • Faculty Power management control ECU

How is the P0A85 code repair?

Start by checking the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

What is the cost to diagnose the P0A85 code

Labor: 1.0

The cost to diagnose the P0A85 code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
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Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P0A85 Meaning

The cooling air flows into the inlet on the right of the rear seat and travels through an intake duct to the battery blower assembly on the right surface of the luggage compartment. Furthermore, the cooling air travels through an intake duct (which connects the battery blower assembly to the upper right surface of the HV battery assembly) and flows to the HV battery assembly.
The cooling air flows from the top to the bottom between the HV battery modules. After it has cooled the modules, it is discharged from the bottom right surface of the HV battery assembly.
The exhaust air travels through an exhaust duct on the right surface of luggage compartment and is discharged into the cabin as well as outside of the vehicle.
The battery ECU uses battery temperature sensors in order to detect the temperature of the HV battery assembly. Based on the results of this detection, the battery ECU controls the battery blower assembly. (Thus, the battery blower assembly starts when the HV battery temperature rises to a predetermined level.)
The speed of the battery cooling blower assembly is controlled by the power management control ECU. Battery cooling blower assembly power is supplied when the FCTL terminal of the power management control ECU turns on the battery blower relay. The power management control ECU sends command signals (SI) to the battery cooling blower assembly to get the fan speed corresponding to the HV battery temperature. Information about the voltage applied to the battery cooling blower assembly (VM) is sent to the power management control ECU as a monitor signal using serial communication via the

More Information

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Information for specific makes

  • P0A85 BUICK Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage
  • P0A85 CADILLAC Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage
  • P0A85 CHEVROLET Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage
  • P0A85 GMC Hybrid/EV Battery Pack Cooling Fan Control Circuit High Voltage
  • P0A85 LEXUS Hybrid Battery Pack Cooling Fan 1 Control Circuit High  📷
  • P0A85 TOYOTA Hybrid Battery Pack Cooling Fan 1 Control Circuit High  📷

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