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Powertrain Source reviewed Lights the check engine lamp

P0BC7: Hybrid/EV Battery Pack Cooling Fan 1 Sense Circuit/Open

Standardized SAE J2012 code · P0Bxx — Hybrid and electric propulsion

Safety-critical system. Faults in airbags, brakes, steering or high-voltage components can put people at risk. Follow the manufacturer's service information and safety procedures, or have the vehicle checked by a qualified workshop.

What does P0BC7 mean?

Many battery cooling fans report their actual speed back to the controller as a pulse signal; Toyota patents describe a rotation sensor on the fan motor whose measured speed is compared with the target. P0BC7 means this feedback line for fan 1 is open or carries no usable signal. No manufacturer documents this exact code publicly; GM's 2016 and 2018 hybrid tables cover the same feedback only through P0BC8, P0BC9 and P0BCA. CARB requires the electrical inputs of battery thermal management to be monitored. The fan may still turn, but the controller can no longer confirm it and usually limits power to protect the pack. Faults in the drive circuit are P0A81 to P0A85; fan 2 feedback has its own codes P0D5F to P0D63.

The code tells you which monitor failed, not which part is broken. Test before replacing parts.

Symptoms

  • Hybrid system warning or MIL on
  • Reduced electric assist or charging power
  • Fan audible even though the code reports no feedback

Common causes

  • High Open feedback wire or loose pin at the fan connector
  • Medium Failed speed sensor or electronics inside the fan unit
  • Low Faulty feedback input in the controlling module

Likelihood is a general estimate across vehicles; your make and model may differ.

Add your car to see reports of P0BC7 on the same make and model first.

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