P2489 — Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5

OBD2 code P2489 flags a problem with the sensor and actuator circuits (exhaust gas temperature sensor circuit intermittent/erratic bank 2 sensor 5). The car is usually drivable while you plan the repair. Common culprits: poor ground connection, corroded, loose or damaged connector, control module driver fault.

powertrain (engine/transmission)

Is it safe to drive?

Short-term driving is OK In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.

How to diagnose with an OBD scanner

Read the code and freeze frame Connect an OBD2 scanner, confirm P2489 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor circuit intermittent/erratic bank 2 sensor 5 for damage, corrosion, chafing or poor contact.
Subsystem check Measure reference voltage, ground and signal continuity at the component connector.
Subsystem check Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2489 does not return.

Approximate repair cost

Repair cost depends on which component actually failed. Typical scenarios for P2489 (parts and labor, USD, independent shop rates): Repair wiring or connectors: $80–$250; Replace the faulty sensor or actuator: $150–$500; Control module repair: $300–$1,000. Overall, fixing P2489 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Common questions

What are the symptoms of P2489?

Drivers most often notice: Check Engine Light on, the affected system operates intermittently or not at all, increased fuel consumption in some cases, possible limp mode depending on the affected component.

Will P2489 clear itself?

Sometimes P2489 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.

How do I diagnose P2489 myself?

Start with a scan: confirm P2489, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the sensor and actuator circuits, and verify the suspect component against live data before buying parts.

What does OBD2 code P2489 mean?

What is the most common cause of P2489?

The most common causes are: poor ground connection, corroded, loose or damaged connector, control module driver fault.

What does P2489 mean?

Behind P2489 is a specific failure in the sensor and actuator circuits: exhaust gas temperature sensor circuit intermittent/erratic bank 2 sensor 5. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.

In this definition, “Bank 2” is the side of the engine opposite to cylinder 1 and “Sensor 5” is the downstream (after the catalytic converter) sensor. Mixing up banks and sensor positions is the most common DIY mistake with this code — verify the physical location before replacing anything.

To set P2489, the control module compares live readings of the sensor and actuator circuits against calibrated limits, usually over several drive cycles. Alongside the code it stores a freeze frame — a snapshot of rpm, load, coolant temperature and vehicle speed at the moment of failure. Reading that snapshot first saves diagnostic time.

What causes P2489?

poor ground connection
faulty sensor or actuator of the affected circuit
open or shorted wiring in the circuit
control module driver fault
corroded, loose or damaged connector

Common symptoms of P2489

Check Engine Light on
the affected system operates intermittently or not at all
increased fuel consumption in some cases
possible limp mode depending on the affected component

How to diagnose P2489

Connect an OBD2 scanner, confirm P2489 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
Visually inspect the wiring harness and connectors related to the exhaust gas temperature sensor circuit intermittent/erratic bank 2 sensor 5 for damage, corrosion, chafing or poor contact.
Measure reference voltage, ground and signal continuity at the component connector.
Wiggle-test the harness while watching the signal in live data — dropouts reveal broken wires.
Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2489 does not return.

How to fix P2489

Start with the cheapest and most common causes before replacing expensive parts:

Repair wiring or connectors — $80–$250
Replace the faulty sensor or actuator — $150–$500
Control module repair — $300–$1,000

How much does it cost to fix P2489?

Repair cost depends on which component actually failed. Typical scenarios for P2489 (parts and labor, USD, independent shop rates):

Repair wiring or connectors: $80–$250
Replace the faulty sensor or actuator: $150–$500
Control module repair: $300–$1,000

Overall, fixing P2489 usually costs between $80 and $1,000. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.

Can you drive with P2489?

In most cases the car remains drivable, possibly with reduced performance or a disabled auxiliary system. If symptoms include stalling, no-start or brake/steering warnings, treat it as urgent.