P2033

DTC P2032 or P2033

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. Initial Inspection and Diagnostic Overview
* Review Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptors

DTC P2032
- Exhaust Temperature Sensor 2 (EGT-2) Circuit Low Voltage

DTC P2033
- Exhaust Temperature Sensor 2 (EGT-2) Circuit High Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The exhaust gas temperature (EGT) sensors are variable resistors that measure the temperature of the exhaust at the inlet and outlet of the diesel particulate filter (DPF). The engine control module (ECM) supplies a bias 5-volt signal to the EGT signal circuit, and supplies a ground to the low reference circuit. When the EGT sensor is cold, the sensor resistance is low. When the EGT temperature increases, the sensor resistance increases.

Conditions for Running the DTC

* The ignition is ON.
* This DTC runs continuously when the above condition is met.

Conditions for Setting the DTC

P2032

The ECM detects that the EGT sensor 2 is less than 0.32 volt for greater than 1 second.

P2033

The ECM detects that the EGT sensor 2 is greater than 3.37 volts for greater than 1 second.

Action Taken When the DTC Sets

* DTC P2032 and P2033 are Type A DTCs.
* Normal regeneration will be inhibited.

Conditions for Clearing the DTC

DTC P2032 and P2033 are Type A DTCs.

Diagnostic Aids

* Inspect the EGT sensor terminals for corrosion.
* Measure and record the resistance of the EGT sensor at various ambient temperatures greater than -8°C (+18°F), then compare those measurements to the Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (EGT Sensors).
* A short to a separate 5-volt source occurs, this DTC will set.

Circuit/System Verification

1. Engine running, observe the scan tool EGT Sensor 2 parameter. The reading should be within the normal range -39 to +999°C (-38 to +1,830°F), depending on the current ambient temperature and the vehicle operating conditions.
2. Operate the vehicle within the Conditions for Running the DTC to verify that the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

Circuit/System Testing

Important: Perform the Repair Verification after performing the Circuit/System Testing.

1. Ignition OFF, disconnect the harness connector at the EGT sensor 2.
2. Ignition OFF for 90 seconds, test for less than 5 ohms between the low reference circuit terminal B 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 EGT Sensor 2 parameter is greater than 998°C (1,828°F).

^ If less than the specified range, test the signal circuit terminal A for a short to ground. If the circuit tests normal, replace the ECM.

4. Install a 3A fused jumper wire between the signal circuit terminal A and the low reference terminal B. Verify the scan tool EGT 2 parameter is less than -35°C (-31°F).

^ If warmer 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 EGT sensor.

Component Testing

Measure and record the resistance of the EGT sensor 2 at various ambient temperatures and compare those measurements to the Temperature Versus Resistance (EGR Temperature Sensors) Temperature Versus Resistance (Fuel Temperature Sensor) Temperature Versus Resistance (IAT Sensor 1) Temperature Versus Resistance (ECT Sensors) Temperature Versus Resistance (IAT Sensor 2) Temperature Versus Resistance (EGT Sensors).

Repair Instructions

* Exhaust Particulate Filter Cleaning (LMM DPF Service Regeneration) Exhaust Particulate Filter Cleaning (LMM DPF Regeneration Enable) for Regeneration Enable
* Exhaust Temperature Sensor Replacement - Position 2
* Engine Control Module Replacement

Repair Verification

Notice: Refer to Diesel Particulate Filter (DPF) Regeneration Enable Notice.

Certain engine control conditions can cause the EPF to overload with soot. It will be necessary to clean the EPF as instructed to remove the excess soot accumulation. To avoid the customer's return to the service department, perform the Exhaust Particulate Cleaning procedure.