Engine Coolant Temperature Sensor Range/Performance (Chrysler)
What does P1482 mean?
The P1482 code means the vehicle's onboard diagnostic system has detected: Engine Coolant Temperature Sensor Range/Performance (Chrysler). This is a moderate severity code.
Common Symptoms
- Check Engine Light illuminated
- Inaccurate temperature gauge reading
- Engine takes too long to warm up per the PCM
- Poor fuel economy due to rich running
- Cooling fans may operate erratically
Probable Causes (Ranked by Likelihood)
- Faulty engine coolant temperature sensor Very High
- Stuck-open thermostat High
- Corroded ECT sensor connector Moderate
- Low coolant level affecting sensor reading Moderate
- Wiring issue between the sensor and PCM Low
Step-by-Step Diagnostic Procedure
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Read the ECT sensor value on a scan tool on a cold engine. It should match ambient temperature within a few degrees.
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Monitor the ECT reading during warm-up. It should rise steadily to the thermostat opening temperature (typically 195-205F).
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Test the sensor resistance with a multimeter. At room temperature it should read approximately 2000-3000 ohms depending on make.
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Inspect the sensor connector for corrosion, water intrusion, or loose fit.
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Check the thermostat by monitoring the upper radiator hose temperature during warm-up.
Frequently Asked Questions
Can a stuck thermostat cause P1482?
Yes. A thermostat stuck open allows coolant to flow continuously through the radiator, preventing the engine from reaching normal operating temperature. The PCM sees this as an out-of-range condition.
Why does this cause poor fuel economy?
The PCM uses the coolant temperature to adjust the fuel mixture. If it thinks the engine is cold, it adds extra fuel (rich mixture) for a longer period, reducing fuel economy.
How do I replace the coolant temperature sensor?
The sensor is typically located near the thermostat housing. Drain some coolant, unplug the connector, and unscrew the sensor. Apply thread sealant to the new sensor and reinstall. Top off coolant.