The position sensor for exhaust heat exchanger bypass valve A reports a performance condition. Heat recovery routing cannot be verified reliably.
Medium severity. Can I keep driving?You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.
Most likely causes
- Sensor offset drifted
- Linkage between sensor and valve worn
- Sensor element aged beyond calibration window
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
What each character of P2C23 means
- P: Powertrain: engine and transmission
- 2: Generic code: same on every make
- C: Subsystem depends on the code range
- 23: Specific fault in that system
Frequently asked questions
Can I keep driving with code P2C23?
You can usually keep driving in the short term. If you smell exhaust fumes in the cabin, stop driving and ventilate the car.
What causes code P2C23?
The most common causes are: sensor offset drifted; linkage between sensor and valve worn; sensor element aged beyond calibration window.
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.