OBD-II code · Powertrain (generic, extended)
P245B EGR Cooler Bypass Control Circuit Range or Performance Bank 1
Same as P245A with the actuator electrically intact yet not delivering the commanded position. EGR mixes inert exhaust into intake to lower combustion peak temperature — too little raises NOx, too much causes misfires and rough running.
Is it safe to drive with P245B?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyBypass valve sticking due to soot
Symptoms
- Check engine light on
- Pinging or knocking under load
- Power loss and hesitation
- Possible rough idle
- Failed emissions inspection (NOx)
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 1–3 h
- Emissions test
- Likely to fail
- Parts involved
- Egr Cooler Bypass Valve B1
Related codes
- P248FEGR Cooler Bypass Control Circuit Range or Performance Bank 2
- P2458DPF Regeneration Duration
- P2459Diesel Particulate Filter Regeneration Frequency
- P245AEGR Cooler Bypass Control Circuit Open Bank 1
- P245CEGR Cooler Bypass Control Circuit Low Bank 1
- P245DEGR Cooler Bypass Control Circuit High Bank 1
- P245EParticulate Filter Pressure Sensor B Circuit
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.