DTC Troubleshooting: P154B
DTC P154B: Battery Sensor Characteristic Abnormal
NOTE: Before you troubleshoot, review the general troubleshooting information.

DTC Description
Confirmed DTC
Pending DTC
P154B Battery Sensor Characteristic Abnormal
    

1.
DTC check:

DTC check
?1.
Turn the vehicle to the ON mode.

?2.
Check the Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
P0112 IAT Sensor Circuit Low Voltage
    
P0113 IAT Sensor Circuit High Voltage
    

Is DTC P0112 and/or P0113 indicated?

     
YES
     
     
     
Do the indicated DTCs troubleshooting.?
     
NO
     
     
     
Go to step 2.
2.
12 volt battery temperature check:

12 volt battery temperature check
?1.
Open the hood, and measure the temperature around the 12 volt battery sensor with a thermometer.

?2.
Start the engine, and let it idle for 10 seconds, then check the parameter(s) below with the HDS.
Signal
Current conditions
Values
Unit
Estimated Battery Temperature
    

Does the value of Estimated Battery Temperature differ 41 °F (23 °C) or more from the value of the thermometer?

     
YES
     
     
     
     
NO
     
     
     
Go to step 3.
3.
12 volt battery sensor signal check:

12 volt battery sensor signal check
?1.
Turn the vehicle to the OFF (LOCK) mode.

?2.
Turn the vehicle to the ON mode.

?3.
Check the parameter(s) below with the HDS.
Signal
Threshold
Current conditions
Values
Unit
Values
Unit
Battery Current (Battery Sensor)
More than 0
A
    

Do the current condition(s) match the threshold?

     
YES
     
     
     
     
NO
     
     
     
Check for poor connections or loose terminals at the 12 volt battery sensor and the PCM. If the on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the on-board snapshot.?