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.

Real-world scan data

Seen in

1,313

scans in the past year

Found in

0.2%

of scans

0.4%

of scans that found faults

Appears alongside · share of P0489 scans

P1646in 19.7% of scans

P0487in 18.5% of scans

P0101in 15.6% of scans

Figures reflect only diagnostic scans recorded through our own apps and tools. Cars are typically scanned because a symptom or warning light prompted it, so these counts describe our scan records — not the incidence of faults in any model, and not the quality, reliability, or safety of any vehicle. No comparison between manufacturers or models is implied. All trademarks belong to their respective owners; no affiliation or endorsement is implied.

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.

Read & clear P0489 yourself

Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.

▶ Get it on Google Play

✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX