Temperature affects fuel density–the colder the fuel, the denser it gets. The engine control module (ECM) keeps track of fuel density to determine how much fuel to spray into the cylinders, which means it must also check fuel temperature. It uses readings from the fuel temperature sensor to adjust the performance of various engine parts and efficiently burn fuel.
The PCM will log a P0183 code if it notices that the signal from the fuel temperature sensor is too high.
What Does the P0183 Code Mean?
The Diagnostic Trouble Code (DTC) P0183 indicates “Fuel Temperature Sensor “A” Circuit High.”
The fuel temperature sensor measures the fuel’s temperature and transmits the appropriate signal to the PCM. Higher signals correlate to colder temperatures and higher fuel densities. The computer uses the signals to calculate the fuel’s density and adjusts various processes in the fuel system and engine.
The fuel temperature sensor helps the PCM adjust the air-fuel ratio to a very fine degree. This helps the engine get the right amount of fuel it needs to meet the load. It also lowers emission levels by reducing the amount of unburned fuel that leaves the engine and exhaust system.
The PCM regularly checks the signal from the fuel temperature sensor and compares the resistance to baseline readings. If the computer doesn’t get the right response from the sensor, it will set the powertrain code P0183.
Note: The definition of code P0183 may differ depending on the vehicle manufacturer. Check the appropriate repair manual or repair database for the exact code definition.
What are the Possible Causes of the P0183 Code?
- Bad fuel temperature sensor
- Faulty PCM
- Problems with the wiring harness of the fuel temperature sensor
What are the Common Symptoms of the P0183 Code?
How to Diagnose the P0183 Code
The P0183 is a powertrain code that applies to OBD-II-compliant vehicles. While it’s a generic code, the steps for diagnosing and fixing it can vary between vehicles.
If you’re not confident about conducting diagnostic tests on your vehicle, it’s a good idea to bring it to a certified mechanic. Otherwise, you may go ahead and diagnose the issue yourself. Here is a video to give you an idea of what the process might involve:
How to Fix the P0183 Code
Attempting to fix a P0183 code may become a frustrating task if you don’t have the right tools and know-how to test the fuel temperature sensor. You will often need a digital multimeter, an electrical wiring diagram, and a repair manual to test the sensor and its wiring. In most cases, it’s best to leave the job to a professional.
For DIYers who prefer to test and replace their vehicle’s fuel temperature sensor on their own, it will be helpful to rely on the appropriate repair manual or refer to an online repair database.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic.