What Is the P0183 Code?
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The P0183 code is a Diagnostic Trouble Code (DTC) that your vehicle’s Powertrain Control Module (PCM) stores when it detects a problem with the Fuel Temperature Sensor A Circuit High. This code is relatively common in flexible fuel vehicles, engines with fuel heaters, and engines running on gasoline or diesel fuel. When the Engine Control Module (ECM) detects an issue with the Fuel Temperature Sensor A Circuit High, it saves the P0183 code. It also turns on the Malfunction Indicator Lamp (MIL) or Check Engine Light (CEL) to let you know there’s a problem.
More About Error Code P0183
For the most part, the generic OBD-II (OBD2) DTC P0183 is logged when the PCM detects that the “A” circuit of the fuel temperature sensor is returning a voltage or resistance figure that is higher than expected.
The fuel temp sensor is located in the fuel tank next to the fuel pump or fuel rail. It measures the actual fuel temperature and then forwards the voltage signal to the PCM. The PCM uses this information to better perform its roles, which include adjusting the fuel delivery strategy, fuel composition codes, fuel injectors’ pulse, and fuel pressure.
The fuel temperature sensor runs on a 5V reference voltage signal from the PCM. The sensor’s resistance decreases as the fuel temperature increases, which means the five-volt reference signal is always fluctuating. Different car manufacturers set different fluctuation ranges for their vehicles, and any readings below or above the range will trigger error codes. A higher-than-expected fuel temperature voltage signal will trigger a P0182 Code.
The P0183 is not exclusively triggered by a high-voltage signal. It may also arise due to a faulty fuel temperature sensor, a short circuit in wiring or connector, or a PCM programming error.
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What Are the Symptoms of a P0183 Code?
The symptoms of a P0183 code, just like other OBD-II codes, vary depending on the make and model of the vehicle. These may include:
- Poor fuel economy
- Check engine light
- Reduced engine power
- Engine not starting
- Reduced acceleration
What Are Some Causes of a P0183 Code?
The P0183 fault code is primarily caused by an unexpectedly high voltage reference signal reading. However, it can also be caused by several additional factors, including
- Faulty fuel temperature sensor
- Defective fuel temperature sensor connector
- Open or shorted circuit in wiring
- Loose or poor connection to the sensor or PCM
- Corrosion of wires or connectors
- Water entry or intrusion into the fuel tank
- Damaged fuel tank temperature sensor
- Defective fuel heater assembly
- Unsound fuel rail temperature sensor
- PCM failure or programming error
- Excessive additives in the fuel
- Fuel contamination levels or fuel composition levels
How Serious Is the P0183 Code?
The P0183 code is generally a mild problem that can be fixed quite easily if diagnosed and inspected in a timely way. However, that doesn’t mean the code is inconsequential. Ignoring it for long can worsen its symptoms and in particular, increase fuel consumption and emissions considerably. Further, the code may eventually lead to engine failure, which can be costly to repair.
Can I Still Drive with a P0183 Code?
Yes, it’s possible to drive with a P0183 code without experiencing any major problems. However, this highly depends on the exact cause of the problem, which you can’t really know unless you do a diagnosis.
For instance, you may be able to drive for a good bit without issues if the code was triggered by a loose connection between the sensor and PCM. On the other hand, you’ll be endangering your engine’s health by driving with a P0183 caused by a serious problem, like high fuel contamination levels or water intrusion.
How Easy Is It to Diagnose a P0183 Code?
The ease of diagnosis depends on your level of expertise and the nature of the problem. Generally, certified mechanics will be able to spot the problem in little time. The process of diagnosing a P0183 code involves several steps, including:
- Verifying the P0183 code with a scanner and checking for other related codes like P0644 OBD-II Trouble Code, P0937 OBD-II Trouble Code, and B1928 OBD-II Trouble Code.
- Performing a visual inspection of the fuel temperature sensor and its wiring harness for damage or corrosion.
- Checking the circuit resistance and voltage signal using a multimeter.
- Testing the fuel temperature sensor’s soundness by comparing the sensor’s input with the ambient temperature sensor’s input.
- Checking a fuel sample and log to determine accurate fuel composition levels and fuel volatility.
- Inspecting the fuel filter to see if there are any signs of contamination.
- Checking for signs of water intrusion in the fuel tank.
- Checking the PCM connector and wiring for any defects, corroded wires, or loose connections.
How Difficult Is It to Inspect a P0183 Code?
Despite the P0183 error code being only a moderate issue, inspecting it can be quite expensive and complicated, depending on the components involved. Inspection costs vary wildly, ranging from the low costs of replacing a faulty sensor to the complex and pricey costs of replacing the circuit wiring or PCM.
Need Additional Help with Your P0183 Code?
To reduce the complexity of diagnosis and high auto repair labor rates, it’s essential to avoid delaying repairs and visit a reputable service center as soon as you notice the symptoms of code P0183. You’ll not only be able to sort out the issue in the shortest time but also avoid follow-up repair appointments, which can be costly.
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