Diagnostic Instructions
DTC Descriptors
DTC P0601: Control Module Read Only Memory (ROM)
DTC P0602: Control Module Not Programmed
DTC P0603: Control Module (TCM) Long Term Memory Reset
DTC P0604: Control Module Random Access Memory (RAM)
Circuit/System Description
This diagnostic applies to internal microprocessor integrity conditions within the transmission control module (TCM) system. This diagnostic also addresses if the TCM is not programmed.
Conditions for Running the DTC
• | The ignition is ON, or the engine is operating. |
• | The DTCs run once an ignition cycle. |
Conditions for Setting the DTC
P0601
The TCM detects that the checksum calculation does not match the expected checksum.
P0602
The TCM is identified as not programmed.
P0603
The TCM detects an incorrect copy of non-volatile memory.
P0604
The TCM detects a random access memory (RAM) read/write error.
Action Taken When the DTC Sets
P0601 and P0602
• | DTCs P0601, and P0602 are Type A DTCs. |
• | The transmission will operate in 5th gear in D or M range, 2nd gear in L range. |
P0603
• | DTC P0603 is a Type A DTC. |
• | The TCM uses default EEPROM values. |
• | The TCM disables engine start. |
P0604
DTC P0604 is a Type A DTC.
Conditions for Clearing the DTC
DTCs P0601, P0602, P0603, and P0604 are Type A DTCs.
Reference Information
Description and Operation
Electronic Component Description
DTC Type Reference
Diagnostic Trouble Code (DTC) Type Definitions
Circuit/System Verification
- Ignition ON, observe the DTC information with a scan tool. Verify that DTC P0602 does not fail this ignition cycle.
⇒ | If DTC P0602 failed this ignition, reprogram the TCM. Refer to
Control Module References
. If DTC P0602 resets, replace the TCM. |
- Observe the DTC information with a scan tool. Verify that DTCs P0601, P0603, and P0604 do not set this ignition cycle.
Repair Instructions
Perform the
Diagnostic Repair Verification
after completing the diagnostic procedure.
Control Module References
for TCM replacement, setup, and programming.