P245A
EGR Cooler Bypass Control Circuit/Open Bank 1
Auxiliary emissions (EGR)
Generic OBD-II
Low
What it means
P245A means the ECM has detected an open (or otherwise faulty) control circuit for the EGR cooler bypass valve on bank 1. That valve routes recirculated exhaust either through or around the EGR cooler to manage temperature and emissions. The car still runs normally, but the system can't control the bypass properly, so it's mainly an emissions and cold-start concern.
Low
Can I keep driving? Yes — the car drives normally; this is an emissions/temperature-control fault, not a running problem.
Common symptoms
What you'll notice
- Check-engine light on
- Often no noticeable change in how the car drives
- Possible small drop in cold-weather emissions performance or slightly higher NOx
- May fail an emissions/readiness test
Common causes
Most likely first
- Open or shorted wiring to the EGR cooler bypass valve/actuatorLikely
- Failed EGR cooler bypass control valve or solenoidCommon
- Corroded or loose connector at the bypass valveCommon
- Poor ground or power feed to the control circuitLess often
- Faulty ECM/PCM driver for the bypass control (least likely)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and confirm the code is current, not a stored history fault.
- Locate the EGR cooler bypass valve and inspect its connector for corrosion, spread pins, or looseness.
- With the key on, check the control circuit for the expected power, ground, and continuity back to the ECM; repair any open.
- Test the bypass valve/solenoid resistance against spec and replace if out of range.
- Clear the code and re-drive; if it returns with wiring verified good, suspect the valve, then the ECM driver.
FAQ
Quick answers
Is it safe to drive with P245A?+
Generally yes. It affects how exhaust heat is managed for emissions, not engine running, so short-term driving is fine — but get it fixed to stay emissions-legal.
Can I just clear P245A?+
You can clear it, but if the circuit is truly open the code returns quickly. Fix the wiring or valve first.
Related codes
Often seen with P245A
Read & clear P245A 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