Emissions

P2472 — Exhaust Gas Temperature Sensor Circuit Low (Bank 1 Sensor 1)

Severity: medium Drive with care, to a shop

What P2472 means

The engine control module monitors the voltage from the exhaust gas temperature (EGT) sensor located upstream of the turbo or particulate filter. P2472 sets when that signal falls below the expected range, usually due to a short to ground in the circuit or a failed sensor. Without accurate temperature data the ECM cannot properly manage boost, filter regeneration or component protection.

Symptoms

  • Check Engine light on
  • Regeneration will not start or is interrupted
  • Reduced power or limp mode
  • Unrealistically low EGT readings on a scan tool
  • Higher fuel consumption
  • Frequent regeneration attempts

Possible causes

  1. Short to ground in the sensor harness
  2. Failed EGT sensor probe
  3. Heat-damaged or corroded connector near the turbo
  4. Moisture in the connector
  5. Rarely, a faulty ECM

How to diagnose

  1. Read all codes and freeze frame data and look for other EGT or particulate filter codes
  2. On a cold engine, compare the EGT reading with ambient temperature
  3. Inspect the harness and connector near the turbo for melting, chafing and corrosion
  4. Unplug the connector and see if the reading changes; test the signal wire for a short to ground
  5. Measure sensor resistance and compare with the manufacturer's specification
  6. Check reference voltage and ground at the ECM side
  7. Clear the code and verify readings on a warmed-up engine after repair

Common fixes

  • Repair or replace the damaged section of harness
  • Replace the connector and clean the terminals
  • Replace the exhaust gas temperature sensor
  • Perform a forced regeneration after the fault is fixed

Questions and answers

What does P2472 mean?

It indicates a low signal in the bank 1 sensor 1 exhaust gas temperature sensor circuit. The usual cause is a wiring short to ground or a bad sensor.

Can I drive with P2472?

Briefly, yes, but don't put it off. Without the sensor data regeneration may not work properly and the particulate filter can clog.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.