DTC U0312 (Battery Condition Monitor Module)
DTC U0312: Battery Condition Monitor Module Programming Error (Version Mismatch)
General Description
The motor control module, battery condition monitor module, and the powertrain control module (PCM) can be updated by software rewriting device communicated via the CAN lines. When the motor control module, battery condition monitor module, or the PCM needs to be updated but either CPU fails rewriting, the indicator comes on and stores a DTC. Each CPU stores software version information, and compare their versions each other by transmitting/receiving via the CAN lines. If the battery condition monitor module judges that its own software version is old, a malfunction is detected and a DTC is stored.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 1.0 second or more |
| DTC Type | One drive cycle, MIL on, POWER SYSTEM indicator on, 12 VOLT CHARGING SYSTEM indicator on |
Enable Conditions
| Condition | ||
|---|---|---|
| Other | The normal status of communication by CAN line between the PCM or the motor control module and the battery condition monitor module | |
Malfunction Threshold
The battery condition monitor module judges that its own software version is old for at least 1.0 second.
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.
- Software version mismatch between the battery condition monitor module and the motor control module
- Software version mismatch between the battery condition monitor module and the PCM
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, the MIL comes on and a Pending DTC, a Confirmed DTC, and the freeze data are stored in the battery condition monitor module memory.
Conditions for clearing the DTC
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.