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, OBD Status

Execution	Continuous
Sequence	None
Duration	5 seconds or more
DTC Type	One drive cycle, MIL off
OBD Status	PASSED/FAILED/NOT COMPLETED (STILL TESTING)

Enable Conditions

Condition
Vehicle	ON mode
No active DTCs set (prevents monitor from running)	P16E3

Malfunction Threshold

Either one of the conditions is met for at least 5 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
	12 volt battery internal resistance measuring circuit or power supply system 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 power supply line open (include fuse fall-outs)
	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.