P0185 - OBD Trouble Code

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The P0185 code can be defined as fuel temperature sensor ‘B’ circuit malfunction. It is a generic OBD-II code which would indicate that the fuel temperature sensor B is malfunctioning. The sensor might not be within the specification or the fuel temperature or fuel rail might be too high or too low

We all are well aware that the modern fuel injection and the ignition system is a complex coordination of the sensor readings as well as actuator outputs. The main aim is to deliver the most efficient power. A number of sensors are used by the engine control module to determine how much fuel to inject at any given moment, thus making precise calculations which are based upon the air flow and temperature, engine load and speed, driver demand as many others.

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

• Faults in the fuel temperature/consumption sensor B
• There can be some issues with the ambient temperature sensor
• Defective intake air temperature sensor
• Problem of open, shorted, or damaged wiring or connectors
• A programming error in the powertrain control module

1. Fuel Temperature Sensor - A lot of issues can arise do to defective Fuel Temperature Sensor. Did you just see P0185 code flashing? Now you know the reason why it is appearing. Get it inspected and replaced on time.
2. Oil Pressure sensor - Faulty Oil Pressure sensor can be the reason why P0185 code is flashing. Visit us to purchase top notch Oil Pressure sensor online.
3. Powertrain Control Module - OBD Code P0185 can appear because of faulty Powertrain Control Module.
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It is vital to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0185 here:

Common Symptoms

• The vehicle won’t be able to start because of frozen fuel from extreme cold conditions and water in the fuel
• If you find out that the fuel is too hot and is boiling, then the vehicle will not start, may stall, or can start losing power
• Erratic sensor readings can be caused because of excessive additives in the fuel and cause the fuel to boil off at lower temperatures which would cause the sensor to malfunction
• The engine control module sets code P0185 and check engine light would start illuminating

Want to correct the Trouble Code P0185? Read these points mentioned below:

• Correct the fuel temperature sensor and replacing it if it is out of specifications
• You must repair or replace a defective connector or wiring to the sensor
• The diesel fuel heater assembly with the temperature sensor should be replaced

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You must use a digital volt-ohm meter and an electrical wiring diagram and repair manual to diagnose faults in the FTS circuit and FTS. 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 can 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.

• The first thing which you should do is to scan the codes and documents the freeze frame data, after that the codes should be cleared to verify if the code returns
• Perform a visual check of all the wiring and connections to the sensor, checking for breaks in the wiring or loose connections
• After that you should disconnect the connection to the sensor and check to see if the sensor is testing within specifications
• Then take a fuel sample to compare the fuel temperature to the sensor input
• The diesel fuel heater should the tested for proper operation to make sure it is working to heat the fuel without overheating the fuel

Common Mistakes When Diagnosing The P0185 Code

• One of the most common mistakes can be not doing a visual check of connections to the sensor to make sure they are making good contact to the fuel heater and fuel temperature sensor
• Do not forget to check the fuel for excessive additives that can cause sensors to malfunction

P0186 - Fuel Temperature Sensor B Circuit Range/Performance

P0187 - Fuel Temperature Sensor B Circuit Low Input

P0188 - Fuel Temperature Sensor B Circuit High Input

P0189 - Fuel Temperature Sensor B Circuit Intermittent