What Does P2182 Mean?
The PCM has detected a fault in the engine coolant temperature sensor 2 circuit. This secondary temperature sensor is used to verify cooling system operation and may be located at a different engine location than the primary sensor.
Common Causes
40%
Failed engine coolant temperature sensor 2
25%
Open or shorted wiring in ECT sensor 2 circuit
20%
Corroded or damaged ECT sensor 2 connector
10%
Low coolant level exposing sensor element to air
5%
Failed PCM unable to read sensor signal
Diagnostic Steps
1
Step 1: Locate ECT sensor 2 (consult service information as location varies by vehicle) and inspect connector for corrosion or damage
2
Step 2: Measure resistance of ECT sensor 2 at various temperatures using thermometer and compare to temperature-resistance chart
3
Step 3: Check voltage signal at PCM connector for ECT sensor 2 circuit - should read approximately 5V reference with sensor disconnected
4
Step 4: Test wiring continuity between sensor and PCM, and check for shorts to ground or voltage
5
Step 5: Verify proper coolant level and that sensor is fully submerged in coolant when system is filled
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the engine coolant temperature sensor 2 circuit. This secondary temperature sensor is used to verify cooling system operation and may be located at a different engine location than the primary sensor.
The most common cause of P2182 (Engine Coolant Temperature Sensor 2 Circuit) is: Failed engine coolant temperature sensor 2
Typical repair costs for P2182 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Loss of secondary temperature monitoring may prevent detection of cooling system problems. Safe for short-term driving but repair promptly to avoid potential overheating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2182 to identify the root cause.
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Quick Info
Category
Powertrain
System
Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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