P2489 code meaning
Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 2 Sensor 5)
Powertrain system Generic code P24xx codes Check engine light
What P2489 means
P2489 points to an unsteady signal from the fifth exhaust probe on bank 2: the value stays within its electrical limits but jumps or drops out briefly. This code is not documented by any manufacturer, as no public layout carries five probes per bank on a twin-bank engine. For the bank 1 position GM shows the method under P2484: samples every 100 ms are compared, and in 2025 a step above 100 °C in 12 of 25 samples, valid only between 140 and 1070 °C, sets a Type B fault. CARB requires monitoring of inputs for erratic behaviour where it affects emissions. Such faults usually come from loose terminals or a harness that touches hot parts, so a careful check of routing and clips pays off.
P2489 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyMedium, DIY possible
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2489
- Warning lamp coming and going
- Jumping value in live data
Common causes of P2489
- Most likelyLoose terminal in the connector
- PossibleHarness touching hot exhaust parts
- Less likelyInternal crack in the probe
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Egt sensor b2s5
What each part of P2489 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| 89 | The exact fault in that area. |
What to do next
- Note P2489 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 P2489
What does P2489 mean?
P2489 means "Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic (Bank 2 Sensor 5)". P2489 points to an unsteady signal from the fifth exhaust probe on bank 2: the value stays within its electrical limits but jumps or drops out briefly. It is a generic code, so it means the same on every make.
Is it safe to drive with P2489?
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 P2489 fail an emissions test?
Yes, it can. P2489 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 P2489 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. A careful DIY repair is possible with basic tools and a scanner.
Will P2489 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.