P237FExhaust Heat Exchanger Exhaust Bypass Valve A Control 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
- P237F is not about wiring of the drive but about the result: the bypass flap A of the exhaust heat recovery unit was commanded, yet the effect the module expects does not appear. Ford judges this partly by temperatures, which is why SSM 52543 for the full hybrids F-150 3.5L (from 2021), Explorer 3.3L and Escape 2.5L (from 2020) and Maverick 2.5L (from 2022), all through 2024, first sends technicians to the connectors of exhaust coolant temperature sensors 3 and 4 – damaged seals, corrosion or water there can set P237F without a bad valve, so the heat exchanger need not be replaced. TSB 24-2173 fixes false P237F on 2024 Mavericks built up to 10 April 2024 with a PCM update. SSM 53003 covers a worn actuator on the F-150. The MIL comes on, driving is unaffected.
- What you may notice
- Check engine light on
- No effect on drivability
- Often stored together with P2C23
- Likely causes
- LikelyWater, corrosion or torn seal at the exhaust coolant temperature sensor 3/4 connectors (Ford SSM 52543)
- PossiblePCM calibration setting the code falsely (2024 Maverick, TSB 24-2173)
- PossibleBypass actuator or flap sluggish, sticking or worn
- 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: €0 – €1,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.