P237F code meaning
Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance
Powertrain system Generic code P23xx codes Check engine light
What P237F means
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.
P237F at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P237F
- Check engine light on
- No effect on drivability
- Often stored together with P2C23
Common causes of P237F
- Most 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
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Exhaust bypass valve aExhaust bypass position sensor aExhaust heat exchanger
What each part of P237F means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 3 | Area: ignition system or misfire. |
| 7F | The exact fault in that area. |
What to do next
- Note P237F and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P237F
What does P237F mean?
P237F means "Exhaust Heat Exchanger Exhaust Bypass Valve A Control Performance". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P237F?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P237F fail an emissions test?
Yes, it can. P237F is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P237F to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P237F clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.