What Does P2489 Mean?
The PCM is detecting an unstable or intermittent signal from the exhaust gas temperature sensor at Bank 2, Sensor 5. The sensor reading fluctuates erratically or drops in and out unexpectedly during operation.
Common Causes
35%
Loose or intermittent connector connection
30%
Damaged wiring harness with intermittent short or open
20%
Failing EGT sensor with intermittent internal fault
10%
Corroded connector terminals with intermittent contact
5%
Vibration-induced wiring damage or poor sensor mounting
Diagnostic Steps
1
Step 1: Perform wiggle test on all connectors and wiring while monitoring live data to reproduce intermittent fault
2
Step 2: Inspect connector terminals closely for corrosion, looseness, or improper terminal retention
3
Step 3: Check sensor mounting torque and verify sensor is properly secured and not vibrating excessively
4
Step 4: Examine wiring harness routing for contact with hot exhaust components or sharp edges causing intermittent damage
5
Step 5: Use data logging or graphing function to capture sensor dropout events during test drive
Estimated Repair Cost
$150 - $750
Parts + labor, varies by vehicle and location
The PCM is detecting an unstable or intermittent signal from the exhaust gas temperature sensor at Bank 2, Sensor 5. The sensor reading fluctuates erratically or drops in and out unexpectedly during operation.
The most common cause of P2489 (Exhaust Gas Temperature Sensor Circuit Intermittent/Erratic Bank 2 Sensor 5) is: Loose or intermittent connector connection
Typical repair costs for P2489 range from $150 to $750, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Generally safe to drive but intermittent faults can cause unpredictable emission system behavior. May experience occasional limp mode or regeneration issues on diesel vehicles.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2489 to identify the root cause.
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Quick Info
Category
Powertrain
System
Emissions Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
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