DTC P0602: Boot Mode (Programming Error) (A/T)
General Description
The transmission control module (TCM) has a rewriting function that can be done in the field. The programs in the A/T CPU are the A/T control program (rewritable program) and the A/T update program (non-rewritable program). When the program rewriting process is not finished normally, such as turning off the TCM power during the rewriting process, and then turning the vehicle to the ON mode again, the A/T CPU starts according to the rewriting function program, and stores a DTC in the TCM.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | One drive cycle, MIL on, A/T gear position indicator blinks |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
The program rewriting process does not finish normally due to an irregular process, such as turning off the TCM power during the A/T CPU rewriting process, and the vehicle is turned to the ON mode again.
Possible Cause
NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- A/T CPU program unwritten
- TCM internal failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the A/T gear position indicator blinks, the MIL comes on, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
Conditions for clearing the DTC
The A/T gear position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The MIL is cleared if the malfunction does not return in three consecutive trips in which the diagnostic runs. The MIL, the Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.