Pinpoint Test 7: DTC P0AA6 - Hybrid Battery Voltage System Isolation Fault

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PINPOINT TEST 7: DTC P0AA6 - HYBRID BATTERY VOLTAGE SYSTEM ISOLATION FAULT

Normal Operation

With the ignition switch in the ON position and the engine on or off (the engine must have run at least once after the key was cycled to ON), the battery control module (BCM) monitors the electrical isolation (leakage resistance) between the high-voltage system and the vehicle chassis. A resistance value of less than 190,000 ohms (for 10 seconds or greater) is a failure. The normal resistance value is between 950,000-1,330,000 ohms.

- DTC P0AA6 (Hybrid Battery Voltage System Isolation Fault) - If the BCM detects a high-voltage system leakage of less than 190,000 ohms for 10 seconds or greater, or if the BCM detects a high-voltage system leakage of less than 66,000 ohms (with no time frame), the vehicle does not restart and the BCM sets this DTC.

Possible Causes
- DC/DC converter wiring harness (high voltage)
- DC/DC converter
- High-voltage cables
- High-voltage traction battery (HVTB)
- Electronically-controlled continuously variable transmission (ECVT)
- Moisture/water penetration of high-voltage connectors

Diagnostic Procedure

WARNING:To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage hybrid system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.

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