P0489
EGR A Control Circuit Low
Exhaust gas recirculation (EGR)
Generic OBD-II
Medium
What it means
P0489 means the ECM has detected an abnormally low voltage on the "A" EGR control circuit — usually a short to ground or an open in the wiring or solenoid. It's an emissions-system fault: the engine still starts and drives, but the EGR valve may not respond to commands, which can show up as rough idle or pinging under load.
Medium
Can I keep driving? Usually drivable — the engine runs, but you may get a check-engine light with rough idle or pinging under load until repaired.
Common symptoms
What you'll notice
- Check-engine light on
- Rough or unstable idle
- Pinging or knocking under load
- Increased emissions or failed emissions test
Common causes
Most likely first
- Short to ground or open in the EGR 'A' control circuitLikely
- Failed EGR valve or control solenoidCommon
- Loose or corroded connector at the EGR valveCommon
- Carbon buildup binding the EGR valveLess often
- Rarely, a failed ECM driverLess often
How to diagnose & fix
Work through it in order
- Inspect the EGR valve connector and control wiring for damage, corrosion, or a short to ground.
- Measure the control circuit and check for a low/grounded signal against spec.
- Test the EGR solenoid/valve resistance; replace it if out of range or stuck.
- Clean carbon from the EGR valve and passages if fouled, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P0489?+
Short-term yes, but a malfunctioning EGR can cause pinging that stresses the engine, so repair it before extended or heavy driving.
Can I just clear P0489?+
It will return on the next drive cycle unless the wiring, solenoid, or valve fault is actually fixed.
Related codes
Often seen with P0489
Read & clear P0489 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