Powertrain, generic (extended)

P2C97 Hybrid/EV Battery Disable Circuit Low

Check engine lightOn
EmissionsNot relevant
Drive cycleNot required
Limp modePossible

P2C97 is set when the high-voltage battery's wired disable input sits below its valid range, typically because the line is chafed through to body ground or the sending module pulls it low permanently. Whether low means shut down depends on the design. Where the line is active-low, a short to ground looks like a constant request to open the contactors, and the battery stays switched off; where a defined level is expected, the controller simply loses a trustworthy signal. The safety value of a hard-wired path is shown in Volkswagen patent US9586481B2, where it opens the contactor faster than a CAN message. No manufacturer documents P2C97 publicly. A shorted line should be traced section by section between the sender and the battery connector. CARB requires monitoring of hybrid components.

Likely causes

Disable line chafed and shorted to ground
Sending module holding the line low permanently
Water in the connector creating a leakage path to ground

Symptoms

  • High-voltage battery stays switched off, no ready mode
  • 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

P2C96P2C98P0A0A

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