P0187 Fault Code

Fuel Temperature Sensor B Circuit Low Input

• What does that mean?
• Symptoms
• Causes
• Solutions

P0187 indicates that the Fuel Temperature Sensor B is sending a low voltage signal to the Engine Control Module (ECM), which can interfere with proper fuel management and engine performance. This fault code can lead to various issues, especially in modern vehicles that rely heavily on accurate sensor data to optimize fuel efficiency and reduce emissions.

What are the symptoms of the P0187 code?

Drivers may experience a variety of symptoms related to P0187, including:

• Poor engine performance, such as reduced power or hesitation during acceleration.
• Increased fuel consumption due to the engine running inefficiently.
• Check Engine Light illuminated on the dashboard.
• Difficulty starting the engine in certain situations.

What causes the P0187 code?

The possible causes of this error code include:

• A malfunctioning fuel temperature sensor B, which may be damaged or have a poor connection.
• Wiring issues such as frayed cables or loose connections between the sensor and the ECM.
• Corrosion at the connectors or fault in the sensor circuit.
• Issues with the ECM itself, which may be failing to interpret the data received from the sensor correctly.

How to fix P0187?

To resolve the P0187 fault code, mechanics typically follow these steps:

• Start by inspecting the wiring and connectors associated with the fuel temperature sensor B for any signs of damage or corrosion.
• If the wiring is intact, test the fuel temperature sensor B to determine if it is functioning correctly and providing accurate readings.
• Replace the sensor if it is found to be faulty.
• Clear the fault codes, take the vehicle for a test drive, and check for reoccurrence of the code.
• If the issue persists, further diagnostics may be necessary to probe the ECM or related components.