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P1186 Chevrolet Code - Engine Oil Temperature Sensor Circuit Performance

Quick Answer

The P1186 code for Chevrolet vehicles indicates a problem with the engine oil temperature sensor circuit performance. Common causes include Faulty Engine Oil Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Wiring Issues: Damage or corrosion in the wiring connecting the sensor to the ECM can disrupt the signal and trigger the P1186 code, ECM Malfunction: A problem with the engine control module's ability to interpret the sensor data accurately can also lead to this code. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1186 Chevrolet indicates Engine Oil Temperature Sensor Circuit Performance.
Common causes
Common causes include Faulty Engine Oil Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM, Wiring Issues: Damage or corrosion in the wiring connecting the sensor to the ECM can disrupt the signal and trigger the P1186 code, ECM Malfunction: A problem with the engine control module's ability to interpret the sensor data accurately can also lead to this code.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P1186 Chevrolet Description

The P1186 code for Chevrolet vehicles indicates a problem with the engine oil temperature sensor circuit performance. This sensor is responsible for monitoring the temperature of the engine oil, which is crucial for ensuring the engine operates within the optimal temperature range. If the sensor detects that the engine oil temperature is too high or too low, it can trigger this diagnostic trouble code (DTC).

OBDII Code P1186 Chevrolet - Engine Oil Temperature Sensor Circuit Performance
P1186 Chevrolet Code - Engine Oil Temperature Sensor Circuit Performance

Common Causes of P1186 Chevrolet

  1. Faulty Engine Oil Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect readings to the ECM.
  2. Wiring Issues: Damage or corrosion in the wiring connecting the sensor to the ECM can disrupt the signal and trigger the P1186 code.
  3. ECM Malfunction: A problem with the engine control module's ability to interpret the sensor data accurately can also lead to this code.
  4. Low Engine Oil Level: Insufficient engine oil can affect the sensor's ability to accurately detect the oil temperature.
  5. Engine Oil Contamination: Contaminated engine oil can interfere with the sensor's performance and trigger the code.

Symptoms of P1186 Chevrolet

  1. Check Engine Light: The most common symptom associated with the P1186 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Engine Performance Issues: The engine may experience reduced performance, rough idling, or stalling due to incorrect engine oil temperature readings.
  3. Poor Fuel Efficiency: A faulty engine oil temperature sensor can lead to decreased fuel efficiency as the engine may not be operating at the optimal temperature.
  4. Overheating or Cooling Issues: Inaccurate oil temperature readings can cause the engine to overheat or not reach the correct operating temperature, leading to potential overheating or cooling issues.

How to Fix P1186 Chevrolet

  1. Diagnose the Issue: Use an OBD-II scanner to retrieve the fault codes and perform a thorough inspection of the engine oil temperature sensor, wiring, and ECM.
  2. Replace the Engine Oil Temperature Sensor: If the sensor is faulty, replace it with a new one following the manufacturer's specifications.
  3. Repair or Replace Wiring: Address any wiring issues by repairing damaged wires or replacing corroded connectors to ensure a secure connection.
  4. Check and Change Engine Oil: Verify the engine oil level and quality, ensuring it is at the correct level and free from contamination.
  5. Clear Fault Codes: After completing the repairs, clear the fault codes with the OBD-II scanner and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P1186 Chevrolet

The typical repair costs for addressing the P1186 code on a Chevrolet vehicle can vary depending on the specific cause of the issue. On average, the cost of replacing the engine oil temperature sensor can range from $100 to $200, including parts and labor. However, if additional repairs or replacements are needed for wiring or other components, the total cost can increase.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

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