P1492 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

P1492 Code failures by brands

P1492 CHRYSLER, DODGE, JEEP, MITSUBISHI: BATTERY TEMPERATURE SENSOR VOLTAGE TOO HIGH

Description of DTC code P1492

The Battery Temperature Sensor (BTS) is a feature of modern vehicle charging systems. In these electrical systems, the battery is an essential component for the good performance of the vehicle.

The Battery Temperature Sensor detects the temperature of the battery, thus checking that the charging system voltage is correct. If inconsistent values are found, the voltage is regulated according to the conditions. If the battery temperature is low, the system voltage is set high, and it will automatically decrease as the temperature rises.

The diagnostic code P1492 OBDII is set on Chrysler, Dodge, Jeep, and Mitsubishi vehicles because the PCM (Powertrain Control Module) has detected the Battery Temperature Sensor value has been above 4.9 volts for 3 seconds with the key on or the engine running.

Symptoms of fault code P1492

Causes of OBD2 P1492

The P1492 OBD2 fault code is set for one of the following reasons:

  • The Battery Temperature Sensor harness may be defective.
  • The battery temperature sensor circuit connections may be damaged, resulting in a short or open circuit.
  • The battery temperature sensor may be in bad condition.

Possible solutions of the DTC code P1492

To troubleshoot the DTC P1492 OBDII, try this:

  • Consult the TSBs.
  • Check that the cables and connections of the battery temperature sensor circuit are in optimum condition for proper operation. If you find common damage, make repairs as required.
  • Measure the BTS circuit voltages and check if they match the values indicated by the manufacturer in their specifications. If you find big differences, make the necessary corrections.
  • Test the integrity of the Battery Temperature Sensor according to the manufacturer's recommendations. If you determine that it is damaged, consider replacing it.

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