P0189 Fault Code

Fuel Temperature Sensor B Circuit Intermittent

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

The P0189 code indicates an intermittent issue with the Fuel Temperature Sensor B circuit. This sensor is responsible for measuring the temperature of the fuel, which is crucial for optimal engine performance and emissions control. When the engine control module (ECM) detects erratic or incorrect signals from this sensor, it triggers the P0189 code. This problem can arise from a variety of factors, including poor electrical connections, a malfunctioning sensor, or issues within the wiring harness.

What are the symptoms of the P0189 code?

You may experience the following symptoms when the P0189 code is present:

• Check Engine Light illuminated on the dashboard
• Poor engine performance or rough idling
• Decreased fuel efficiency
• Difficulty in starting the engine
• Possible engine stalling under certain conditions

What causes the P0189 code?

Several factors can lead to the P0189 fault code, such as:

• Faulty fuel temperature sensor
• Damaged wiring or connector related to the sensor
• Poor electrical connections
• Corrosion or dirt in the sensor or connectors
• Issues with the ECM processing the signal from the sensor

How to fix P0189?

To resolve the P0189 fault code, you should take the following steps:

• Inspect the fuel temperature sensor and replace it if faulty
• Check the wiring harness and connectors for damage or corrosion and repair as needed
• Ensure all electrical connections are clean and tight
• Use a scan tool to clear the codes and run the engine to see if the code returns
• If the problem persists, further diagnose the ECM for potential issues