P245D
EGR Cooler Bypass Control Circuit High Bank 1
EGR / emissions
Generic OBD-II
Low
What it means
P245D means the ECM has detected an abnormally high voltage in the control circuit for the EGR cooler bypass valve on bank 1. That valve routes exhaust gas either through or around the EGR cooler to manage EGR temperature. The fault is usually electrical — wiring, a connector, or the valve itself — and it affects emissions rather than how the car drives.
Low
Can I keep driving? Yes — this is an emissions control fault; the car drives normally, but fix it to keep EGR cooling and emissions correct.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Possible failed emissions test
- On some diesels, incomplete or delayed particulate-filter regeneration
Common causes
Most likely first
- Short-to-voltage or open in the EGR cooler bypass valve control wiringLikely
- Corroded or loose connector at the bypass valve/actuatorCommon
- Failed EGR cooler bypass valve or its control solenoidCommon
- ECM driver circuit fault (least common)Less often
How to diagnose & fix
Work through it in order
- Scan and read freeze-frame data to see when the fault set.
- Inspect the bypass valve connector and wiring for damage, corrosion, or a short to power.
- Measure the valve/solenoid resistance and check for proper power and ground.
- Replace the EGR cooler bypass valve if it fails testing.
- Clear the code and re-test; suspect the ECM only if wiring and valve check good.
FAQ
Quick answers
Is it safe to drive with P245D?+
Generally yes — it is an emissions control fault, not a safety one. The car should drive normally, but repair it so EGR cooling and emissions stay correct and it can pass an emissions test.
Can I just clear P245D?+
You can clear it, but if the wiring or bypass valve is faulty it will return. Fix the underlying circuit first.
Related codes
Often seen with P245D
Read & clear P245D yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX