P00A3
Charge Air Cooler Temperature Sensor Circuit High Bank 2
Forced induction (charge air)
Generic OBD-II
Low
What it means
P00A3 means the bank 2 charge air cooler (intercooler) temperature sensor is sending a signal that's too high — usually an open circuit or a sensor reading out of range. On turbocharged or supercharged engines the ECM uses this reading to manage boost and charge-air cooling, so a fault rarely stops the car but should be repaired to keep boost control accurate.
Low
Can I keep driving? Safe to drive — this is a sensor-signal fault; the engine still starts and runs, though boost control may be slightly conservative until it's fixed.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Possible slight reduction in boost or power on turbo/supercharged engines
Common causes
Most likely first
- Faulty charge air cooler (intercooler) temperature sensor on bank 2Likely
- Open or short-to-voltage in the sensor signal wiringCommon
- Corroded or loose sensor connectorCommon
- Less commonly, an ECM/PCM faultLess often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to confirm the bank 2 charge-air-cooler temp reading.
- Inspect the sensor connector and wiring for damage, corrosion, or an open circuit.
- Measure the sensor's resistance/voltage against specification for the current temperature.
- Replace the charge air cooler temperature sensor if it reads out of range, then clear and retest.
FAQ
Quick answers
Is it safe to drive with P00A3?+
Yes, for normal driving. It's a temperature-sensor signal fault, not an engine-safety issue, though the ECM may limit boost slightly until it's repaired.
Can I just clear P00A3?+
You can, but if the sensor or its wiring is still faulty the code returns. Fix the sensor or connection first.
Related codes
Often seen with P00A3
Read & clear P00A3 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX