DTC Advanced Diagnostics: P06A8
DTC P06A8 : Internal VCC Power Malfunction
General Description
The transmission control module (TCM) monitors the internal 5 V power supply by comparing it to the A/D input power supply voltage (3.3 V). When the 5 V power supply is normal, the comparison power supply voltage (3.3 V) falls within a normal area. But if the 5 V power supply malfunctions, the comparison power supply voltage (3.3 V) exceeds the range of normal area. If the comparison power supply voltage is out of permissible range for a set time, the TCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 2 seconds or more |
| DTC Type | One drive cycle, MIL on, Shift position indicator blinks |
Enable Conditions
| Condition | |
|---|---|
| Other | When the vehicle is turned to the ON or OFF (LOCK) mode |
Malfunction Threshold
The TCM internal comparison power supply voltage is specified value or less, specified value or more for at least 2 seconds.
Possible Cause
The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
- TCM (internal 3.3 V or 5 V power supply circuit) failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on, the shift position indicator blinks, and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory.
Conditions for clearing the DTC
The shift 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.