DTC P154A: Battery Sensor Internal Failure (2017)

General Description 

Courtesy of HONDA, U.S.A., INC.

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 LIN line and transmits/receives 12 volt battery sensor information to/from the powertrain control module (PCM) via the 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, OBD Status 

Enable Conditions 

Malfunction Threshold 

Either one of the conditions is met for at least 10 seconds:

• Internal current detection circuit open/characteristic abnormal 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 blown)
• 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.