What it means
The control module internal temperature sensor B signal is outside its expected range or performance. The code does not identify the cause by itself.
At a glance
- Usually lights the check-engine light
How it works
The control module monitors its internal temperature sensor B to check the temperature inside the module. P06AC sets when the sensor's signal does not behave as expected for the measured conditions, which can point to the sensor, its circuit, or a poor connection.
Common causes
Most likely first.
- Internal temperature sensor B fault
- Open or short in sensor circuit
- Poor connector contact
Symptoms
- Check-engine light may be on
- Module-related faults or reduced engine operation may occur
How to diagnose it
- Use a scan tool to record freeze-frame data and check whether other module or temperature-related codes were stored at the same time.
- Compare the reported internal temperature sensor B reading with other available temperature readings and the vehicle's conditions to see whether it is implausible or erratic.
- Inspect the module connector and accessible sensor B wiring for loose fit, corrosion, moisture, or damage.
- With the wiring diagram, check sensor B circuit continuity and for shorts, following the manufacturer's diagnostic procedure.
- If the circuit and connections are sound, test the internal sensor B and module according to the manufacturer's specification.
Common fixes
- Clean and secure a poor module connector contact.
- Repair damaged wiring or an open or short in the sensor B circuit.
- Replace the internal temperature sensor B if it fails testing.
- Repair or replace the control module if its sensor input is faulty.
Can I keep driving?
If the engine runs normally and no other warnings appear, a short, cautious trip for diagnosis may be possible. Avoid demanding driving if engine operation changes or other module faults appear, since the module may limit or disrupt engine control.
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.