P245BEGR Cooler Bypass Control Circuit Range/Performance (Bank 1)
- 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
- P245B is set when the bank 1 bypass is electrically intact but does not reach or hold the commanded position, or when switching it has no visible thermal effect. GM's 2017 Duramax with a position-controlled DC-motor flap compares setpoint and feedback; a tracking error above 16 % in 1280 of 1600 samples, with a steady setpoint, coolant over 70 °C and outside air above minus 23 °C, sets a Type B fault, and P24A5 follows if the flap is then found stuck. Ford's 2023 diesels, the 6.7 L and the 3.0 L, run an intrusive test once per trip: the flap is moved, and if the gas temperature after the cooler changes by less than 3 °C per second, P245B is logged. Carbon on the flap shaft, a worn linkage, a weak vacuum supply or a position sensor fault are typical causes. Pure circuit faults are P245A, P245C and P245D.
- What you may notice
- Malfunction indicator lamp on
- Longer warm-up or higher NOx when the bypass stays in one position
- Likely causes
- LikelyBypass flap or shaft sticking from carbon deposits
- PossibleBypass position feedback inaccurate
- PossibleWeak vacuum supply or leaking hose on vacuum-operated bypass
- RareSlow EGR temperature sensor after the cooler
- 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: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.