What it means
The control module compares ambient air temperature sensor B with expected values or other available temperature readings. It sets this code when sensor B's reading is outside the expected range or does not change as expected.
At a glance
- Usually lights the check-engine light
How it works
Ambient air temperature sensor B measures outside air at its particular sensing location, which may be separate from sensor A. The control module checks whether sensor B's reading stays within a plausible range and changes as expected; P00DA means the reading is implausible or its behavior does not match expectations, rather than specifically indicating a low or high circuit signal.
Common causes
Most likely first.
- Ambient air temperature sensor B fault
- Wiring or connector fault
- Sensor reading inconsistent with the expected range
Symptoms
- Check-engine light on
- Outside-temperature display may be inaccurate
- Climate control may respond incorrectly
How to diagnose it
- Review freeze-frame data and live sensor B readings, then compare them with actual ambient conditions and any other available temperature readings.
- Inspect sensor B and its mounting location for damage, looseness, blockage, or exposure to an unusual heat source that could skew the reading.
- Check the connector and wiring for corrosion, loose pins, chafing, or signs of intermittent contact.
- Observe sensor B data as temperatures change and check whether it responds smoothly rather than staying fixed or changing implausibly.
- Test the sensor and its circuit against the manufacturer's specification to distinguish a drifting sensor from a wiring fault.
Common fixes
- Secure sensor B if it is loose or poorly positioned.
- Repair damaged wiring or connector contacts in the sensor B circuit.
- Replace ambient air temperature sensor B if its reading remains implausible despite a sound circuit.
Can I keep driving?
This fault usually affects the outside-temperature display or climate-control response, not basic engine operation, so normal driving is generally possible. If climate control behaves unpredictably, have the sensor and its mounting location checked.
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.