P0187 Code - Fuel Temperature Sensor 'B' Circuit Low Input
Quick Answer
The P0187 diagnostic trouble code (DTC) refers to the Fuel Temperature Sensor 'B' Circuit Low Input. Common causes include Faulty fuel temperature sensor: The sensor itself may be malfunctioning and providing incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can result in a low input signal, ECM malfunction: A problem with the engine control module can also cause the sensor to report a low input. 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
- P0187 indicates Fuel Temperature Sensor 'B' Circuit Low Input.
- Common causes
- Common causes include Faulty fuel temperature sensor: The sensor itself may be malfunctioning and providing incorrect readings to the ECM, Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can result in a low input signal, ECM malfunction: A problem with the engine control module can also cause the sensor to report a low input.
- 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.
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Code P0187 Description
The P0187 diagnostic trouble code (DTC) refers to the Fuel Temperature Sensor 'B' Circuit Low Input. This code indicates that the fuel temperature sensor circuit is reporting a lower than expected voltage signal to the engine control module (ECM). The fuel temperature sensor is responsible for measuring the temperature of the fuel in the fuel tank, allowing the ECM to adjust the fuel mixture accordingly for optimal combustion. When the sensor reports a low input, it can lead to improper fuel delivery and potentially affect the vehicle's performance.
Common Causes of P0187
- Faulty fuel temperature sensor: The sensor itself may be malfunctioning and providing incorrect readings to the ECM.
- Wiring issues: Damaged or corroded wiring connecting the sensor to the ECM can result in a low input signal.
- ECM malfunction: A problem with the engine control module can also cause the sensor to report a low input.
- Fuel contamination: Contaminants in the fuel can affect the sensor's readings and lead to a low input signal.
Symptoms of P0187
- Decreased fuel efficiency: A faulty fuel temperature sensor can cause the ECM to deliver an incorrect fuel mixture, leading to decreased fuel efficiency.
- Engine misfires: Improper fuel delivery can result in engine misfires and rough idling.
- Difficulty starting: Incorrect fuel mixture can make it difficult for the engine to start, especially in cold weather.
- Check Engine Light: The illumination of the Check Engine Light is a common symptom of a fuel temperature sensor circuit low input.
How to Fix P0187
- Diagnose the issue: Use a scan tool to read the DTC and perform a visual inspection of the sensor and wiring.
- Test the sensor: Check the resistance of the fuel temperature sensor using a multimeter to determine if it is within the specified range.
- Inspect wiring: Check for any damage or corrosion in the wiring harness and repair or replace as needed.
- Replace sensor: If the sensor is faulty, replace it with a new one and clear the DTC.
- Test drive: After repairs, test drive the vehicle to ensure that the issue has been resolved.
Cost to Fix P0187
The cost of repairing a fuel temperature sensor 'B' circuit low input can vary depending on the make and model of the vehicle, as well as the labor rates in your area. On average, the cost of replacing a fuel temperature sensor can range from $100 to $200, including parts and labor. Additional costs may apply if wiring repairs or ECM replacement are necessary. It's recommended to consult with a qualified mechanic to get an accurate estimate for your specific vehicle.
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Code P0187 Information for Specific Makes
- P0187 Ford — Engine Fuel Temperature Sensor 'B' Circuit Low Input
- P0187 Mercedes-Benz — Fuel Temperature Sensor 'B' Circuit Low Input
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