DTC P154A (1.5 L Engine)
DTC P154A: Battery Sensor Internal Failure
General Description
The 12 volt battery sensor is connected between the 12 volt battery and ground. It is also connected to the gauge control module by the local interconnect network (LIN) line and transmits/receives 12 volt battery sensor information to/from the powertrain control module (PCM) via the controller area network (CAN) line. The 12 volt battery sensor measures the 12 volt battery's current, voltage, and temperature. When the PCM requests this information to operate the engine electrical system efficiently, the 12 volt battery sensor runs a diagnostic program and sends the results to the PCM via the LIN and the CAN line. If the diagnostic results are outside the normal range, the PCM detects a malfunction and stores a DTC.
Monitor Execution, Sequence, Duration, DTC Type
| Execution | Continuous |
| Sequence | None |
| Duration | 10 seconds or more |
| DTC Type | One drive cycle, MIL off |
Enable Conditions
| Condition | |
|---|---|
| Vehicle | ON mode |
Malfunction Threshold
Either one of the conditions is met for at least 10 seconds:
- Internal current detection circuit open or A/D conversion circuit abnormal
- Internal voltage detection circuit open/short or A/D conversion circuit abnormal
- Internal temperature detection circuit open/short or A/D conversion circuit abnormal
- Calibration data abnormal
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.
- 12 volt battery sensor internal circuit failure
Diagnosis Details
Conditions for setting the DTC
When a malfunction is detected, a Pending DTC, a Confirmed DTC, and the freeze data are stored in the PCM memory. The MIL does not come on.
Conditions for clearing the DTC
The Pending DTC, the Confirmed DTC, and the freeze data can be cleared with the scan tool Clear command or by disconnecting the 12 volt battery.