Guide To P0189 OBD Error Code Solutions

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The OBD-II code powertrain control module failure can be defined as fuel temperature sensor ‘B’ circuit intermittent. The fuel temperature sensor would tell the engine control module the temperature of the fuel. if the powertrain control module would detect an implausible signal from the fuel temperature sensor, then the powertrain control module would set the P0189 fault code.

The main purpose of the fuel temperature sensor is to monitor the temperature of the fuel which is inside the fuel tank and would transfer this information of the powertrain control module.

It also monitors the fuel for some possible contamination of water, dirt or ethanol. If the fuel temperature is not in the appropriate range, the fuel temperature sensor would then send a signal to alert the powertrain control module of the error.

The P0189 fault code would be stored in by the powertrain control module. The check engine light would start appearing for some vehicles, and it can take longer for the check engine light to come on for some vehicles.

What causes this problem with the Fuel Temperature Sensor B Circuit Intermittent?

• The wiring or connectors might be shorted or damaged
• There can be some defects in the fuel temperature/composition sensor
• Faulty intake air temperature sensor
• A bad ambient temperature sensor
• PCM or a PCM programming error

1. Fuel Temperature Sensor - Do you remember when was the last time you got your car Fuel Temperature Sensor checked up? A damaged Fuel Temperature Sensor can cause a lot of issues like displaying P0189 code.
2. Oil Pressure sensor - Oil Pressure sensor is an important car part which should never be neglected. May be there is some fault in it due to which P0189 code may start flashing.
3. Powertrain Control Module - Defective car Powertrain Control Module can be a major reason why P0189 code depicts. So, make sure to replace it online so that you don’t have to face any further issues.
4. Diagnostic Tools - Do you want to buy some high-grade diagnostic tools online? We are here at your service.

We at Parts Avatar Canada care for our customers, and that’s why we will help you to diagnose P0189 code by listing out some major symptoms. They are mentioned below as follows:

Common Symptoms

• There may be no symptoms at all
• Check engine light has come on
• Engine misfire
• Car hesitates at times
• Car hesitates upon acceleration
• Car will not start up
• Multiple fuel system trouble codes

The repairs which you will have to do to correct this fault code are simply straightforward, you can surely pinpoint the necessary repairs on the basis of your diagnosis. Have a look at some common fixes:

• Repairing broken fuel temperature sensor wires
• Repairing any bad grounds
• Repairing broken fuel temperature sensor connector
• Replacing the fuel temperature sensor
• Replacing the fuel pump
• Replacing the power control module

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Do you want to diagnose the faults in the FTS circuit and FTS? Then you must use digital volt-ohm meter and an electrical wiring diagram and repair manual. The FTS is situated in the fuel tank, as part of the fuel sending unit, or practically anywhere else, before the fuel injectors, in the fuel system. You can always check your manual for the precise location of the FTS. It would depend on the location of the ECM and FTS you may have to work to get at their connectors, such as if located in the fuel tank under the seat. One can start this diagnosis from the ECM or from the FTS, it would all depend on what can be easily accessed.

• Carefully inspect all wiring that leads to the sensor and connector, looking for wires that are burned or those that may have shorted out. If it is necessary, you should replace damaged circuitry as well as connectors
• An OBD-II scanner should be used to retrieve all trouble codes that have been stored by the power control module as well as any freeze frame data
• All the codes should be cleared and perform a test drive of the vehicle. The P0189 trouble code may or may not come back immediately
• If the P0189 trouble code does not come back, then it would indicate that there is an intermittent problem. Intermittent problems may take longer to diagnose. It may be necessary to allow the intermittent problem to get worse before it can be diagnosed properly.
• If the P0189 trouble code comes back immediately, then you must find the fuel temperature sensor connector. Carefully check the reference voltage and ground signals with the help of a digital volt ohmmeter
• If you find out that there is no voltage, they will examine the continuity and resistance on the reference circuit of the powertrain control module
• The system should be tested again after replacing or repairing damaged wiring or connectors
• You should use an oscilloscope to test continuity and resistance of the ground circuits. These results should match the specifications of the manufacturer
• Once you are able to ascertain a reference voltage and ground signal, then you should check the waveform patterns by connecting the oscilloscope to the fuel temperature sensor wire.
• Referencing the live data, check to see if that waveform pattern matches the specifications of the manufacturer
• A high waveform frequency would mean that the fuel contaminants are high. This can be determined by comparing sensor waveform frequency with real fuel composition
• A fast waveform pulse also means that the fuel temperature is high. This can be determined by comparing the sensor waveform pulse width data with real fuel temperature data.
• You should replace the fuel temperature sensor if the data that was collected does not match to the real conditions
• If you want to ensure that the repair is successful, then you should test the fuel system once again

Common Mistakes When Diagnosing The P0189 Code

• In some cases, the P0189 trouble code will be a serious concern. It can prevent the car from starting in addition to poor driving performance.
• In other cases, when there are no symptoms, the P0189 trouble code is not considered serious. It is still important to have this issue addressed immediately, whether or not symptoms are present.