P0489 code meaning
EGR A Control Circuit Low
Powertrain system Generic code P04xx codes Check engine light
What P0489 means
Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. P0489 means the drive circuit of EGR valve A – solenoid, stepper or DC motor – is shorted to ground. GM's Duramax LML sets it at 0.5 Ω or less to ground for 3 s, GM's 2016 diesels after 96 of 120 samples, Ford diesels after 0.35 s, Saab's 2.0 TiD likewise – MIL after two trips. The valve is usually switched off; with low-side control a short to ground can keep it energised and open, causing rough idle or stalling.
P0489 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 3 hours
- Clears after repairAfter a drive cycle
Symptoms of P0489
- Check engine light on
- EGR switched off
- Rough idle or stalling if the valve stays open
Common causes of P0489
- Most likelyHarness chafed at the exhaust with short to ground
- PossibleEGR valve winding shorted to its housing
- PossibleWater or corrosion in the connector
- Less likelyDriver in the engine module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
EGR valveEGR valve actuatorEGR wiringEngine control module
What each part of P0489 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 89 | The exact fault in that area. |
What to do next
- Note P0489 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0489
What does P0489 mean?
P0489 means "EGR A Control Circuit Low". Exhaust gas recirculation (EGR) routes part of the exhaust back into the intake to lower combustion temperature and NOx. It is a generic code, so it means the same on every make.
Is it safe to drive with P0489?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0489 fail an emissions test?
Yes, it can. P0489 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0489 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P0489 clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.