P2473 indicates a circuit malfunction within the exhaust gas temperature sensor located on engine bank 2 at position 4. This sensor monitors heat levels downstream of the emissions system to manage regeneration cycles and protect components. The control module has detected voltage or resistance values outside the expected operational range.
Internal sensor elements degrade over time due to extreme heat cycling and vibration.
Insulation melts or wires break from proximity to hot exhaust components or physical abrasion.
Moisture and road salts cause terminal corrosion leading to high resistance or open circuits.
Loss of reference voltage supply prevents the sensor from sending a signal to the module.
Wiring chafes against the engine block or exhaust, causing a short to ground or power.
Internal driver failure is rare and should only be considered after all external circuits are verified.
No, PCM failure is rare; this code almost always indicates a faulty sensor or wiring harness issue.
Yes, but prolonged driving may prevent emissions system cleaning cycles and damage filters.
It is typically found downstream of the diesel particulate filter or catalytic converter on the bank without cylinder 1.
Unlikely to damage the engine directly, but it may lead to clogged filters if regeneration is inhibited.