P2C23Exhaust Heat Exchanger Exhaust Bypass Valve A Position Sensor Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- P2C23 means the flap position reported for exhaust heat exchanger bypass valve A is electrically valid but does not make sense – for example it disagrees with the command or with how the coolant behind the exchanger warms up. A Ford patent shows that such plausibility can be judged from temperatures. Ford documents P2C23 on several full hybrids: SSM 49531 notes it on 2021 F-150 PowerBoost trucks at or below freezing, TSB 21-2053 reprograms the PCM on trucks built up to 15 February 2021, and SSM 52543 (F-150, Explorer 3.3L, Escape 2.5L, Maverick, up to 2024) first checks the connectors of exhaust coolant temperature sensors 3 and 4 for water and corrosion before the heat exchanger is condemned. Driving is unaffected; the MIL is on.
- What you may notice
- Check engine light, often after frost
- No noticeable change in driving
- Heater warms up more slowly
- Likely causes
- LikelyWater or corrosion in the connectors of exhaust coolant temperature sensors 3/4 (Ford)
- PossibleOutdated PCM calibration (early 2021 F-150 PowerBoost)
- PossibleWorn, sticking or frozen bypass actuator
- RareFlap or linkage in the heat exchanger binding
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.