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P0189 Code – What Does It Mean & How To Fix It

This is one of the most frequent OBD2 trouble codes. Read the full article below to know what it means, how to fix it, and what other codes may show related to it.


The fuel temperature sensor ‘2’ circuit intermittent problem is referred to in the DTC code P0189. This code is connected to OBD II, a system that constantly controls various aspects of the vehicle’s performance, fuel management, and emissions.


The OBDII system will send the P0189 code as soon as it senses an intermittent problem in the fuel temperature sensor ‘2’ circuit. The fuel temperature sensor plays an important role in providing information to the ECM engine control module, as it is concerned with the Fuel Temperature of the tank.


The P0189 issue code may appear due to a number of possible causes, including the following:

  • Faulty Fuel Temperature Sensor: A malfunctioning or damaged fuel temperature sensor ‘2’ can intermittently produce inaccurate readings or no readings at all.
  • Cabling Problems: Intermittent signal issues with the fuel temperature sensor ‘2’ might be brought on by damaged, corroded, or disconnected cabling and connections.
  • Sensor Circuit Problems: Intermittent short circuits or open circuits in the sensor circuit may lead to erratic readings.
  • ECM Malfunction: The engine control module itself may occasionally interpret sensor data incorrectly, which will set off the code in rare circumstances.


The following signs and symptoms may appear in the car when the P0189 code is present:

  • Check Engine Light: The most noticeable symptom is the illumination of the Check Engine Light on the dashboard.
  • Variable Engine Performance: Because of inconsistent sensor readings, the engine may occasionally encounter rough idling or stalling.
  • Reduced Fuel Efficiency: Intermittent problems with the fuel temperature sensor “2” may cause a less-than-ideal fuel supply, which will have a negative impact on fuel economy.


An experienced mechanic or expert will carry out the following procedures to diagnose the P0189 code:

  • OBD-II Scanner: An OBD-II scanner will be used to retrieve the trouble code and any related codes stored in the system.
  • Visual Inspection: To find any obvious problems, a visual examination of the fuel temperature sensor “2,” wiring, and connections will be done.
  • Fuel Temperature Sensor ‘2’ Testing: A multimeter will be used to test the sensor’s voltage and resistance in order to ascertain how well it will perform under various engine circumstances.
  • Examining the wire: The technician will carefully look for corrosion or damage in the wire and connections.
  • ECM Testing: If all other parts are in working order, it could be necessary to test or reprogram the ECM.

Common mistakes

Some frequent errors to avoid throughout the diagnostic and repair procedures include:

  • Ignoring Intermittent Problems: Although intermittent issues might be difficult to identify, they shouldn’t be disregarded because they can result in recurrent error codes.
  • Changing Components Without Proper Testing: In order to prevent unforeseen costs, it is crucial to carry out extensive testing prior to changing any components.

How serious is this?

The severity of the P0189 code depends on what kind of driving condition it is in and how severe its symptoms are. While the vehicle may still be drivable, ignoring the issue could lead to decreased fuel efficiency and potential engine performance problems.

What repairs can fix the code?

repair manuals

Following diagnosis, the following repairs could be required to fix the P0189 code:

  • Fuel Temperature Sensor “2” Replacement: If the sensor is broken, a new one has to be fitted.
  • Wiring and Connector Repair or Replacement: Damaged parts will need to be repaired or replaced.
  • ECM Reprogramming or Replacement: The ECM could occasionally need to be reprogrammed or replaced.

Related codes

Other related codes that may accompany P0189 include P0185 (Fuel Temperature Sensor ‘2’ Circuit), P0186 (Fuel Temperature Sensor ‘2’ Circuit Range/Performance), and P0188 (Fuel Temperature Sensor ‘2’ Circuit High Input).


Intermittent problems with the fuel temperature sensor “2” circuit, which may have an impact on engine performance and fuel efficiency, are indicated by the P0189 DTC code. It is important to address the issue as soon as possible if you have noticed an illumination in your Check Engine Light or experienced any problems with engine performance. The diagnosis and repair of the problem will be facilitated by seeking assistance from a qualified mechanic so that your vehicle works correctly and reliably.

P0189 Code – What Does It Mean & How To Fix It