Conditions for Setting the DTC

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

P0601

The ECM checksum value is incorrect for at least one sample. Each sample is 50 milliseconds. The ECM detects that the check sum value is incorrect for 0.05 second. This diagnostic runs continuous.

P0602

The ECM has not been programmed with Key On and Engine Off for one sample. Each sample is 100 milliseconds. The ECM has not been programmed at Key On and Engine Off for 0.1 second. This diagnostic runs continuous.

P0603

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 sample is 10 milliseconds. The ECM detects that the check sum value at the last power down does not match the ECM check sum value during the current power up is incorrect for 0.01 second. This diagnostic runs once per ignition cycle at power up.

P0604

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 milliseconds. 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 milliseconds. 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 milliseconds. This portion runs continuously.

P0606

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

P0607

The state of health discrete line between the ETC internal processor and the ECM is not toggling for more than 0.5 seconds. This DTC runs continuously.

P060D

The difference between the main processor (ECM) indicated accelerator pedal position and the MHC processor indicated accelerator pedal position is more than 2.5 percent.

P062F

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.

P2610

This diagnostic has 2 tests that may set this DTC:

Phase 1

The ECM detects the ignition off timer is less than 1 second at any time.
OR
The ECM detects the ignition off timer is 15 seconds or more if the actual elapsed time is less than 15 seconds.
This diagnostic runs continuous.

Phase 2

The last ignition off time event increments more than 1.375 seconds or less than 0.8 second for each second.
This diagnostic runs continuous.