DTC Advanced Diagnostics: P154B (2.0L Engine)

DTC P154B: Battery Sensor Characteristic Abnormal

General Description

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

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 LIN line by the request of the PCM. If the AD conversion circuit in the current detection circuit is abnormal for a specified time, the PCM detect a malfunction and stores a DTC.

Monitor Execution, Sequence, Duration, DTC Type

Execution	Once per driving cycle
Sequence	When the engine is restarted after the engine has stopped for at least 8 hours
Duration	5 seconds or more
DTC Type	Two drive cycles, MIL off

Enable Conditions

Condition
Vehicle	ON mode

Malfunction Threshold

The AD conversion circuit in the current detection circuit is abnormal for at least 5 seconds.

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 during the first drive cycle, a Pending DTC is stored in the PCM memory. If the malfunction returns in the next (second) drive cycle, a Confirmed DTC and the freeze data are stored. 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.