P2484: Exhaust gas temperature sensor circuit intermittent/erratic — bank 1, sen… — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
The controller detects an irregular or interrupted signal at this temperature-sensing circuit. Contact or signal issues can produce rapid fluctuations without a matching physical temperature change. Preserve freeze-frame data and follow manufacturer test steps. This code refers to bank 1, 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: P2484-00, P248400 (some scan tools add the fault-type byte, e.g. -00).