Code P2486 indicates the powertrain control module (PCM) has detected a voltage signal from the exhaust gas temperature (EGT) sensor on bank 2, sensor 5 that is below the calibrated minimum threshold. This typically means the sensor circuit is shorted to ground, has an open circuit, or the sensor itself has failed low.
The sensor element has degraded or shorted internally, producing a low-voltage signal that the PCM interprets as a circuit fault.
The signal wire for the EGT sensor has contacted ground due to insulation damage, chafing, or heat exposure near the exhaust.
A broken wire, corroded terminal, or unplugged connector prevents the sensor signal from reaching the PCM, resulting in a default low reading.
Moisture intrusion or heat cycling has caused high resistance or a partial short at the sensor or PCM connector pins.
Internal PCM failure affecting the EGT sensor input circuit is possible but uncommon; verify all external causes before considering module replacement.
The vehicle may enter reduced-power mode and emissions controls (such as DPF regeneration) will be impaired. Extended driving risks catalyst or filter damage.
No. PCM failure is a rare cause. The sensor, its wiring, or connectors are responsible in the vast majority of cases.
Clearing the code only resets the light. If the underlying circuit fault remains, the code will return once the PCM runs its monitor.
Yes. The PCM uses EGT data to manage regeneration temperature. A faulty sensor can prevent or abort regeneration, leading to soot accumulation.