Hybrid Battery Pack Deterioration

Code p0a7f stands for hybrid battery pack deterioration hybrid vehicles have high voltage nickel metal hydride or lithium ion batteries. The battery ecu calculates the resistance of the hv battery through amperage and voltage and uses this resistance to determine the extent of deterioration of the hv battery. The driving cycle of a hybrid vehicle subjects the battery pack to repeated shallow depths of discharge of less than 10 of the battery capacity.

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While there s no onboard test for the lifespan or health of the battery the best indicator of a properly functioning pack is the vehicle s fuel economy.

Hybrid battery pack deterioration.

That may include but is not limited to vehicles from honda accord civic insight toyota prius camry lexus etc. If the battery ecu detects that the resistance of the hv battery has exceeded the standard it determines that malfunction has occurred. Hybrid battery pack deterioration what does that mean. This is a generic diagnostic trouble code dtc and applies to many obd ii vehicles 1996 newer.

It is also used to store energy recovered during regenerative braking and when the motor s are act as generators. Some cells can be full while other cells in the same battery pack are empty. This battery deterioration means that the individual cells within the battery pack can have a different charge level and capacity they are no longer in sync with each other. The unused capacity undergoes a correctable degradation process that reduces battery capacity.

The high voltage hv battery is used to power the electric drive motor s. As a hybrid crosses the 100k mile mark and the vehicle takes on a new life in its older years the battery systems that power the drivetrain will start to wear out and fail.