What it means
The ECM detects a circuit fault on the drive motor a temperature sensor b circuit. Reading cannot be used reliably for control.
At a glance
- Usually lights the check-engine light
- The engine or gearbox may go into limp mode
How it works
Drive Motor A temperature sensor B reports temperature to the control module so it can manage motor protection. This code sets when the module detects a fault in sensor B's circuit and cannot rely on its reading.
Common causes
Most likely first.
- Sensor failed
- Wiring or connector fault
Symptoms
- EV/hybrid system warning light on
- Reduced motor power or torque
- Possible limp mode or vehicle shutdown
How to diagnose it
- Check freeze-frame data and live data for Drive Motor A temperature sensor B, and note whether the reported value is missing, implausible, or changes as the fault occurs.
- With the vehicle safely powered down according to its service instructions, inspect sensor B's connector and accessible wiring for damage, loose fit, corrosion, or contamination.
- Check the sensor B circuit connections and wiring continuity using the manufacturer's procedure, looking for an open, short, or poor connection.
- Test sensor B and its circuit against the manufacturer's specifications to distinguish a failed sensor from a wiring or connector fault.
- Repair the identified fault, then clear the code and confirm sensor B data is plausible and the code does not return.
Common fixes
- Reconnect and secure a loose sensor B connector.
- Repair damaged wiring or corroded terminals in the sensor B circuit.
- Replace a failed Drive Motor A temperature sensor B.
- Clear the code and verify normal sensor B readings and motor operation.
Can I keep driving?
Avoid hard acceleration or demanding driving because the vehicle may limit motor torque or enter limp mode. If a hybrid or EV warning appears with severe power loss or a shutdown warning, stop somewhere safe and arrange service; continued operation may reduce motor protection.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.