OBD-II code · Powertrain (generic, extended)
P245D EGR Cooler Bypass Control Circuit High Bank 1
Same as P245A with the control line shorted to supply. 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 P245D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyControl line shorted to supply
- Less likelyConnector pins corroded - high contact resistance
- Less likelySupply wire pinched against B+ source
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
- P2491EGR Cooler Bypass Control Circuit High Bank 2
- P245AEGR Cooler Bypass Control Circuit Open Bank 1
- P245BEGR Cooler Bypass Control Circuit Range or Performance Bank 1
- P245CEGR Cooler Bypass Control Circuit Low Bank 1
- P245EParticulate Filter Pressure Sensor B Circuit
- P245FParticulate Filter Pressure Sensor B Circuit Range or Performance
- P2460DPF Restriction — Forced Limited Power
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.