Open circuit or high resistance in the battery temperature sensor signal or ground wire; Corroded, loose or damaged sensor connector; Faulty battery temperature sensor (internal open circuit); Sensor damaged or disconnected during battery replacement or other underbonnet work; Signal wire chafed or corroded where it runs near the battery tray or under the battery; Fault in the powertrain control module sensor circuit.

P1492

Battery Temperature Sensor Voltage Too High.

Dodge
Powertrain
Manufacturer code
Low severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
4: AreaAuxiliary emission controls
92: FaultThe specific fault in that area

What it means

P1492 on a Dodge means the powertrain control module has seen the battery temperature sensor signal voltage sit above its expected range. The sensor is a thermistor that tells the PCM how warm the battery is, so it can adjust charging voltage. A reading that is too high usually points to an open circuit, a poor connection or a faulty sensor, since the signal is pulled towards reference voltage.

Symptoms

Charging system or battery warning light may come on
Malfunction indicator lamp illuminated
Battery undercharged or repeatedly going flat
Battery overcharged, with signs of heat or electrolyte loss in some cases
Slow cranking after the car has been left standing

Possible causes

Open circuit or high resistance in the battery temperature sensor signal or ground wirelikely
Corroded, loose or damaged sensor connectorlikely
Faulty battery temperature sensor (internal open circuit)likely
Sensor damaged or disconnected during battery replacement or other underbonnet workpossible
Signal wire chafed or corroded where it runs near the battery tray or under the batterypossible
Fault in the powertrain control module sensor circuitrare

How to diagnose

Read stored codes and freeze frame data, and note whether any charging system or battery codes are also present
Visually inspect the battery, tray and sensor for damage, corrosion, acid leakage or a sensor that has come loose
Check the sensor connector and PCM connector for corrosion, bent or pushed-back pins and poor retention
Using live data, compare the displayed battery temperature with the actual temperature of a cold battery; an implausible or extreme reading suggests a fault
Back-probe the sensor with the ignition on and check the reference voltage and ground against the wiring diagram for the model
Measure the sensor resistance at a known temperature and compare it with the manufacturer's specification, as the location and values vary by model
Check the signal and ground wires for continuity and for any short to voltage, following the wiring diagram
Test the battery state of charge and the charging system output to see whether the fault has affected charging

How to fix

Clean or replace the corroded or damaged sensor connector and terminals
Repair or replace the open or damaged signal or ground wiring
Replace the battery temperature sensor if its resistance is out of specification
Refit or properly secure the sensor if it was displaced during battery work
Recharge or replace the battery if it has been damaged by overcharging or deep discharge
Replace the PCM only after wiring and sensor have been proven good, and only if the manufacturer's procedure confirms a controller fault

Can I keep driving?

Low severity

The car can normally be driven while you arrange a repair, but watch the battery and charging warning lights. Get it checked soon, as incorrect charging control can shorten battery life or leave you with a flat battery.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.