P0BC7Hybrid/EV Battery Pack Cooling Fan 1 Sense Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- 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.
- What you may notice
- Hybrid system warning or MIL on
- Reduced electric assist or charging power
- Fan audible even though the code reports no feedback
- Likely causes
- LikelyOpen feedback wire or loose pin at the fan connector
- PossibleFailed speed sensor or electronics inside the fan unit
- RareFaulty feedback input in the controlling module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.