Powertrain, generic (extended)

P2C96 Hybrid/EV Battery Disable Circuit/Open

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

Besides commands over the vehicle network, many high-voltage batteries have a separate wired input through which another controller can force the contactors open. The best-known use is the crash signal: in Volkswagen patent US9586481B2 the battery opens its contactor 10–100 ms after a hard-wired crash signal, versus roughly 20–200 ms when the message arrives over CAN, and blocks reclosing until the stored fault has been erased. Coda patent US20110304202A1 also ties battery disconnection to the airbag deployment decision. What exactly feeds the disable line is up to the maker. P2C96 means this line is open. No manufacturer documents the code publicly. Many designs read a lost signal as a shutdown request, so the car may not become ready. CARB requires monitoring of hybrid components.

Likely causes

Disable line or its connector at the battery pack interrupted
Sending controller (e.g. crash or airbag module) not driving the line
Connector left unplugged after body or battery repair
Input stage in the battery controller defective

Symptoms

  • Vehicle does not become ready to drive
  • High-voltage system warning

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€50–2,000
Time0.5–5 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

hybrid battery disable switchwiring harnessbms

Related codes

P2C97P2C98P0A0AP0AA0

References: patents.google.com, patents.google.com, law.cornell.edu.