DTC U0404
DTC U0404: Invalid Data Received From Shifter
General Description
Without CAN gateway
With CAN gateway
The transmission control module (TCM) and the SBW shifter control module (integrated with the SBW shifter assembly) are connected with a communication line (F-CAN A and F-CAN B). For shift position switching control, the shift position signal from the SBW shifter control module via F-CAN B is used for main signal, and the shift position signal from the SBW shifter control module via F-CAN A is used for back-up signal. If the TCM receives following signal for a specified duration, the TCM detects a malfunction and stores a DTC.
- Invalid shift position signal sent from the SBW shifter control module via F-CAN A line and abnormal shift position signal sent from the SBW shifter control module via F-CAN B line.
- Abnormal shift position signal sent from the SBW shifter control module via F-CAN A line and invalid shift position signal sent from the SBW shifter control module via F-CAN B line.
- Invalid shift position signal sent from the SBW shifter control module via F-CAN A line and invalid shift position signal sent from the SBW shifter control module via F-CAN B line.
- Abnormal shift position signal sent from the SBW shifter control module via F-CAN A line and abnormal shift position signal sent from the SBW shifter control module via F-CAN B line.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1 second or more |
| DTC Type | One drive cycle, MIL off, A/T gear position indicator blinks |
Enable Conditions
| Condition | Minimum | Maximum |
|---|---|---|
| 12 volt battery voltage [Battery Voltage] | 9 V | 16 V |
| Vehicle | ON mode | |
[ ]: HDS Parameter
Malfunction Threshold
One of these conditions is met for at least 1 second:
- The TCM receives invalid shift position signal sent from the SBW shifter control module via F-CAN A line and abnormal shift position signal sent from the SBW shifter control module via F-CAN B line.
- The TCM receives abnormal shift position signal sent from the SBW shifter control module via F-CAN A line and invalid shift position signal sent from the SBW shifter control module via F-CAN B line.
- The TCM receives invalid shift position signal sent from the SBW shifter control module via F-CAN A line and invalid shift position signal sent from the SBW shifter control module via F-CAN B line.
- The TCM receives abnormal shift position signal sent from the SBW shifter control module via F-CAN A line and abnormal shift position signal sent from the SBW shifter control module via F-CAN B line.
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.
- SBW shifter control module internal failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the A/T gear position indicator blinks and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the TCM memory. The MIL does not come on.
Conditions for clearing the DTC
The A/T gear position indicator comes off by turning the vehicle to the OFF (LOCK) mode. The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command.