P237EExhaust Heat Exchanger Exhaust Bypass Valve A Control Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- P237E is logged when the driver for exhaust bypass flap A on a heat recovery unit sees a control voltage above its expected range. The likely story is a short from the control wire to a supply feed or an actuator whose internal driver has failed in a way that pulls the line up. The flap then no longer follows the warm-up strategy. Ford is the one maker that names the code publicly, and only once: SSM 53003 lists P237E together with P237C, P237D, P237F, P2C22 and P2C23 for 2021–2023 F-150 hybrids with the 3.5L PowerBoost and blames the actuator mounted on the heat exchanger, which is replaced with a service kit after normal diagnosis. A lit MIL is reported. P237D is the low-side mirror image and P23A4 the same fault on valve B; a high signal rarely heals by itself.
- What you may notice
- Check engine light on
- Cabin heat may build up later on cold days
- Likely causes
- LikelyHeat exchanger bypass actuator with failed internal driver (Ford F-150 SSM 53003)
- PossibleControl wire shorted to a supply circuit in the harness
- RareHeat-damaged connector with bridged pins
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.