P01BC code meaning
Engine Oil Temperature Sensor B Circuit High
Powertrain system Generic code P01xx codes Check engine light
What P01BC means
The engine oil temperature sensor B is an NTC thermistor fed with 5 V through a resistor: the hotter the oil, the lower the signal voltage. The engine module uses the oil temperature for variable cam timing (Ford disables it with cold oil or a sensor fault), engine protection and the oil life monitor; many engines have no such sensor and use a calculated oil temperature instead. Sensor B is a second oil temperature sensor whose position is defined by the manufacturer. P01BC means the signal of sensor B sits near the reference voltage – it would report very cold oil; typically an open circuit, unplugged connector or short to voltage. Thresholds are presumably similar to sensor A (GM above 450 kΩ after 20 s of running), but are not documented for B. No manufacturer document using the B-sensor codes was found, so it is unclear who fits a sensor B; the description follows sensor A and CARB's circuit monitoring requirement.
P01BC at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyEasy, DIY possible
- Typical labor0.3 to 1.5 hours
- Clears after repairAfter a drive cycle
Symptoms of P01BC
- Check engine light on (depending on manufacturer)
- Oil temperature shows minimum
- Usually no driving symptoms
Common causes of P01BC
- Most likelyConnector or wire of sensor B open
- PossibleSensor B open
- Less likelyShort to voltage
- Less likelyControl module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine oil temperature sensor bSensor wiring
What each part of P01BC means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 1 | Area: fuel and air metering. |
| BC | The exact fault in that area. |
What to do next
- Note P01BC and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P01BC
What does P01BC mean?
P01BC means "Engine Oil Temperature Sensor B Circuit High". The engine oil temperature sensor B is an NTC thermistor fed with 5 V through a resistor: the hotter the oil, the lower the signal voltage. It is a generic code, so it means the same on every make.
Is it safe to drive with P01BC?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P01BC fail an emissions test?
Yes, it can. P01BC is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P01BC to fix?
Difficulty: easy. A typical repair takes 0.3 to 1.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P01BC clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.