DTC Advanced Diagnostics: P154A
DTC P154A:Battery Sensor Internal Failure

General Description

The 12 volt battery sensor is connected between the 12 volt battery and ground. The 12 volt battery sensor measures the 12 volt battery’s current, voltage, and temperature. The measured value is sent to the powertrain control module (PCM) via the local interconnect network (LIN) line by the request of the PCM. The 12 volt battery sensor has a self diagnostic function and sends the results to the PCM via the LIN 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 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.