DTC P0601Control Module Read Only Memory (ROM)

Circuit Description

The PCM EEPROM contains data which is essential to running the engine and transmission. The PCM continuously tests the integrity of this data.

Conditions for Running the DTC

The ignition switch is in the crank position or the run position.

Conditions for Setting the DTC

The PCM is unable to correctly read data from the flash memory.

Action Taken When the DTC Sets

Conditions for Clearing the MIL/DTC

Replace the PCM.

Diagnostic Aids

Replace the PCM even if this DTC exists only in history.

For an intermittent, refer to Symptoms .

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. This DTC indicates an internal PCM condition.







Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?


Go to Step 2

Go to A Powertrain On Board Diagnostic (OBD) System Check



Program the replacement PCM. Refer to PCM Replacement/Programming .

Replace the PCM. Is the action complete?


Go to Step 3



  1. Select the Diagnostic Trouble Code (DTC) option and the Clear DTC option using the scan tool.
  2. Idle the engine at the normal operating temperature.
  3. Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
  4. Operate vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?


Go to Step 4

Go to Step 2


Select the Capture Info option and the Review Info option using the scan tool. Does the scan tool display any DTCs that you have not diagnosed?


Go to applicable DTC table

System OK