P2488: Exhaust gas temperature sensor circuit range/performance — bank 2, sensor… — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
The measured response does not match the expected calibrated range or performance relationship. This plausibility error is not proof of physically excessive exhaust temperature or a failed sensor. Compare readings under manufacturer-defined conditions. This code refers to bank 2, sensor 5; exact physical location and thresholds vary by vehicle.
Affected system: Exhaust gas temperature monitoring
Symptoms
- Warning light may illuminate
- Related system function may be impaired
- Vehicle-specific symptoms vary
Possible causes
- Exhaust or emissions plumbing leak, restriction, valve fault, sensor fault, or damaged wiring
- Related wiring, connector, power or ground fault
- Vehicle-specific mechanical or control issue
What to check
- Record stored and pending codes and freeze-frame data
- Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
- Confirm measured values against the vehicle service information
- Retest under the conditions that set the code
- Inspect the relevant exhaust or emissions plumbing and electrical connections, then compare commanded operation with sensor feedback during the enable conditions.
- Repair the verified cause and confirm the code does not return
Also written as: P2488-00, P248800 (some scan tools add the fault-type byte, e.g. -00).