What Does P2185 Mean?
ECT sensor 2 voltage is too high, indicating an implausibly low temperature reading (high resistance suggests very cold coolant). This typically points to an open circuit in the sensor or wiring.
Common Causes
45%
Open circuit in ECT sensor 2 (internal failure)
35%
Disconnected, corroded, or damaged sensor connector
15%
Broken or open signal wire between sensor and PCM
5%
Poor ground connection at sensor or PCM
Diagnostic Steps
1
Step 1: Visually inspect ECT sensor 2 connector for looseness, corrosion, or pushed-back pins; wiggle connector while monitoring live data for dropouts
2
Step 2: Disconnect sensor and check for 5V reference at harness connector with key on; if present, problem is sensor or connector
3
Step 3: Measure resistance across sensor terminals; open circuit (infinite resistance) indicates failed sensor
4
Step 4: Check continuity of signal wire from PCM to sensor connector; repair any breaks in harness
5
Step 5: Verify sensor ground circuit has less than 0.5 ohms resistance to battery negative
Estimated Repair Cost
$75 - $300
Parts + labor, varies by vehicle and location
ECT sensor 2 voltage is too high, indicating an implausibly low temperature reading (high resistance suggests very cold coolant). This typically points to an open circuit in the sensor or wiring.
The most common cause of P2185 (Engine Coolant Temperature Sensor 2 Circuit High) is: Open circuit in ECT sensor 2 (internal failure)
Typical repair costs for P2185 range from $75 to $300, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive but engine may run overly rich at startup, have elevated idle, or poor cold-start performance. Monitor actual coolant temperature to prevent overheating.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2185 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
