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DTC P0602-P0606, P060A, P060B, P060D, P060E, P061A, P061C, P061D, or P062F (LLU)

DTC P0602-P0606, P060A, P060B, P060D, P060E, P061A, P061C, P061D, or P062F (LLU)

Diagnostic Instructions


Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure.

Review Strategy Based Diagnosis for an overview of the diagnostic approach.

Diagnostic Procedure Instructions provides an overview of each diagnostic category.


DTC Descriptors

DTC P0602 00

Control Module Not Programmed

DTC P0603 00

Control Module Long Term Memory Reset

DTC P0604 00

Control Module Random Access Memory Performance

DTC P0605 00

Control Module Programming Read Only Memory Performance

DTC P0606 00

Control Module Processor Performance

DTC P060A 00

Control Module Monitoring Processor Performance

DTC P060B 00

Control Module Analog to Digital Converter Performance

DTC P060D 00

Control Module Accelerator Pedal (APP) Position System Circuitry Performance

DTC P060E 00

Control Module Throttle Position System Circuitry Performance

DTC P061A 00

Control Module Torque System Circuitry Performance

DTC P061C 00

Control Module Engine Speed System Circuitry Performance

DTC P061D 00

Engine Load

DTC P062F 00

Control Module Long Term Memory Performance

Circuit/System Description

These diagnostic applies to internal microprocessor integrity conditions within the engine control module (ECM) and the throttle actuator control (TAC) system. This diagnostic also addresses if the ECM is not programmed.

The ECM monitors its ability to read and write to the memory. It also monitors a timer function. The ECM and TAC processors are used to monitor the data of the TAC system. Both processors monitor the data of the other processors in order to validate that the indicated accelerator pedal position is calculated correctly. The ECM performs an intrusive diagnostic to check that the accelerator pedal position (APP) signals are not shorted. To do this, the ECM temporarily lowers APP sensor 2 and checks whether sensor 1 also gets lowered.

Conditions for Running the DTC


P0602 00

The ignition switch is in run or crank.

DTC P0602 00 runs once per ignition cycle.



P0603 00

The ignition switch is in run or crank.

DTC P0603 00 runs once per ignition cycle.



P0604 00

The ignition switch is in run or crank.

The read/write test at power-down in the last drive cycle had completely finished.

DTC P0604 00 runs once per ignition cycle when the above condition is met.



P0605 00

The ignition switch is in run or crank.

The system voltage is more than 5.23 V.

DTC P0606 00 runs continuously when the above conditions are met.



P0606 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P0606 00 runs continuously when the above conditions are met.



P060A 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTCs P0602 00, P0603 00, P0604 00, P0605 00, P0606 00, and P062F 00 are not set

DTC P060A 00 runs continuously when the above condition is met.



P060B 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P060B 00 runs continuously when the above conditions are met.



P060D 00

DTC P0606 00 is not set.

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTCs P060D 00 runs continuously when the above conditions are met.



P060E 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P060E 00 runs continuously when the above conditions are met.



P061A 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P061A 00 runs continuously when the above conditions are met.



P061C 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P061C 00 runs continuously when the above conditions are met.



P061D 00

DTCs P0100 00, P0102 00, or P0103 00 are not set.

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTC P061D 00 runs continuously when the above conditions are met.



P062F 00

The ignition is ON or the engine is running.

The system voltage is more than 5.23 V.

DTCs P062F 00 runs once per ignition cycle.


Conditions for Setting the DTC

P0602 00

The ECM detects programming error, or programming incomplete. This DTC runs continuously.

P0603 00

The ECM check sum value at the last power down does not match the ECM check sum value during the current power up for one sample. Each test is 10 mS. The ECM detects that the check sum value at the previous power down does not match the ECM check sum value during the current power up for 0.01 seconds. This diagnostic runs once per ignition cycle at power up.

P0604 00

The ECM is unable to correctly write and read to and from random access memory (RAM) during the following conditions:


Key up initialization for one count. Each count is a read and write sample. Each sample is 100 mS. This portion runs once per ignition cycle.

Counter increments by 10 for each sample that does not correctly read and write to the RAM, and decrements by one for each correct sample. No more than 20 counts which do not read and or write correctly. Each read and write sample is 100 mS. This portion runs continuously.

Counter increments by 10 for each sample that does not correctly read and write to the desired throttle position RAM and decrements by one for each correct sample. No more than 20 counts which do not read and or write correctly. Each read and write sample is 12.5 mS. This portion runs continuously.


P0605 00

The ECM detects that the TAC system has a process sequence error, clock error, and 2 motor processor errors, or TAC internal processor is not operating correctly. Each test runs in 12.5, 25, 50, 100 or 250 mS. This DTC runs continuously.

P0606 00, P060A 00

The ECM detects read only memory (ROM) errors. These DTCs runs continuously.

P060B 00

The ECM detects an incorrect internal analog/digital (A/D) signal for less than 1 s.

P060D 00, P060E 00

The APP sensor 1 and APP sensor 2 voltage is more than 2.5% for more than 3 s during the intrusive test, or the APP sensor calculations in the main processor differ from the motor control processor by more than 0.95-1.8 V. These diagnostics run continuous.

P061A 00, P061C 00, P061D 00

The ECM detects an internal calculation error between calculated engine load and actual engine load. These diagnostics run continuous.

P062F 00

The ECM did not complete the last electrically erasable programmable read only memory (EEPROM) write event during the last ECM power down. This diagnostic runs once per ignition cycle at power up.

Action Taken When the DTC Sets


DTCs P0602 00, P0604 00, P0605 00, P0606 00, P060A 00, P060B 00, P060D 00, P060E 00, P061A 00, P061C 00, P061D 00, and P062F 00 are Type C DTCs.

DTC P0603 00 is a Type D DTCs.

The engine control module commands the throttle actuator control system to operate in reduced engine power mode.

The service vehicle soon indicator may illuminate.

Under certain conditions, the engine control module commands the engine OFF.


Conditions for Clearing the DTC


DTCs P0602 00, P0604 00, P0605 00, P0606 00, P060A 00, P060B 00, P060D 00, P060E 00, P061A 00, P061C 00, P061D 00, and P062F 00 are Type C DTCs.

DTC P0603 00 is a Type D DTCs.


Reference Information

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference


Circuit Testing

Connector Repairs

Testing for Intermittent Conditions and Poor Connections

Wiring Repairs


DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Circuit/System Testing


1. Observe the DTC information with the scan tool. Verify DTC P0602 00 is not set.

2. If DTC P0602 00 is set, attempt to program the K20 Engine Control Module. Refer to Control Module References . If DTC P0602 00 resets, perform the following steps:

Ensure that all tool connections are secure.

Ensure that the programming equipment is operating correctly.

Ensure the correct software and the correct calibrations are being used.

Attempt to program the K20 Engine Control Module. Refer to Control Module References .

If DTC P0602 00 resets, replace the K20 Engine Control Module.

3. Test the K20 Engine Control Module voltage circuits at ECM connector X2 terminals 70, 6, and 76 and test the ground circuit at ECM connector X2 terminal 1, 2, and 3 for the following:

A short

An open

High resistance

If all circuits test normal, replace the K20 Engine Control Module.


Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.

Control Module References for control module replacement, programming and setup