The engine control module (ECM) supplies 5 volts to the DOC exhaust gas temperature sensor on the 5-volt reference circuit. The ECM also provides a ground on the low reference circuit. The DOC exhaust gas temperature sensor provides a signal to the ECM on the DOC exhaust gas temperature signal circuit which is relative to the pressure changes in the manifold. The ECM should detect a low signal voltage at a DOC exhaust gas temperature, such as low engine load. The ECM should detect high signal voltage at a high DOC exhaust gas temperature, such as high engine load. The ECM monitors the DOC exhaust gas temperature sensor signal for voltage outside the normal range of the DOC exhaust gas temperature. If the indicated temperature from the exhaust gas temperature sensor 1 is too high but within normal sensor circuit operating range, this DTC will set.

The ECM detects that the exhaust gas temperature (EGT) sensor 1 temperature is too high, but within normal sensor circuit operating range.

DTC P2080 is a Type B DTC.

DTC P2080 is a Type B DTC.

Inspect for any recent engine mechanical repairs or for a plugged exhaust.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Verify the integrity of the EGT sensor by inspecting for the following conditions:

Important: Perform the Circuit/System Verification before proceeding with the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the DOC exhaust gas temperature sensor.
2. Ignition OFF, test for less than 5 ohms between the low reference circuit terminal A and ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the ECM.

3. Ignition ON, verify the scan tool DOC Exhaust Gas Temperature parameter is less than 10°C (34°F)

⇒	If greater than the specified range, test the signal circuit terminal B for a short to ground. If the circuit tests normal, replace the ECM.

4. Install a 3-amp fused jumper wire between the signal circuit terminal A and the low reference circuit terminal B. Verify the scan tool Exhaust Gas Temperature 1 parameter is greater than 950°C (1,742°F).

⇒	If less than the specified range, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the ECM.

5. If all circuits test normal, test or replace the exhaust gas temperature sensor 1.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.