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P2555 is a diagnostic trouble code (DTC) for "Throttle/Fuel Inhibit Circuit High". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light is on diagnostic inspection. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
P2555 is the generic OBD-II code for Throttle/Fuel Inhibit Circuit High.
You will typically see this DTC in diesel-powered vehicles. It indicates that the voltage signal being sent to the PCM (powertrain control module) FICM (fuel injection control module) by the throttle or fuel inhibit circuit falls outside of the expected parameters by more than 10 percent. The FICM regulates how much fuel is delivered by the fuel injectors, and when.
The most common causes of this DTC include:
The code will store and the Check Engine or Service Engine Soon lamp will illuminate. There may be engine misfires, or a no-start condition. This DTC is often accompanied by other FICM codes like P2552, P2553, and/or P2554.
Diagnosis may involve:
Technicians sometimes turn first to the fuel delivery system, without completely inspecting all of the circuitry and connections involved with the FICM. While the fuel injectors may be at fault, this is much less common than issues with the FICM pins or clips.
This condition can cause the vehicle to exhibit anything from engine misfires to the complete inability to operate the vehicle. This means that it’s important to have the problem addressed as soon as possible, to prevent getting stuck somewhere with a no-start condition as well as to protect the engine from serious damage.
Possible fixes for this DTC include:
Experts report that the most common source of this DTC setting is by far faulty connections in the FICM. For example, a clip may seem to be seated securely but if it is not all the way connected, pins can back out, triggering this code. Likewise, a bent pin can easily create this issue.
It can be incredibly time consuming and laborious to fix this problem on your own. If a lock tab on the FICM becomes damaged, the clip will no longer be able to hold the FICM connector in place. This is another common source of a P2550 series code setting. If you have recently installed a new FICM, the connections or wiring are almost certain to be the cause of the problem.
In some cases, manufacturers utilize fuel pump safety interrupter switches. You want to make sure this switch has not been activated, otherwise you will waste time carrying out all of the other diagnostic procedures in vain.
Due to the complexity of the wiring and connections involved in the FICM, you will need a manufacturer’s wiring schematic, along with specialized tools such as a scanner and a digital volt/ohmmeter. Don’t hesitate to contact a professional technician if you have trouble with this repair.
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