P2555 OBD-II Trouble Code: Throttle/Fuel Inhibit Circuit High

Our certified mechanics come to you · Get a fair and transparent estimate upfront

Red-stars EXCELLENT RATING ON

Cost of diagnosing the P2555 code

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 code definition

P2555 is the generic OBD-II code for Throttle/Fuel Inhibit Circuit High.

What the P2555 code means

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.

What causes the P2555 code?

The most common causes of this DTC include:

  • Bent or damaged FICM connector pins
  • An open or short in the related circuitry or connectors
  • Defective fuel injectors

What are the symptoms of the P2555 code?

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.

How does a mechanic diagnose the P2555 code?

Diagnosis may involve:

  • Using a scanner to read all stored codes and capture freeze frame data
  • Clearing the vehicle’s computer of the fault codes, then test driving the vehicle to see if any of them return
  • Diagnosing and repairing any DTCs which occurred before P2555
  • Visually inspecting all wiring, connectors, and pins associated with the FICM to check for chafing, insulation damage, shorts, opens, loose connections, damaged or bent pins
  • Inspecting the fuel injectors and their wiring and connections, if no connection problems are found with the FICM
  • Testing fuel pump and fuel injection fuses under start-up conditions

Common mistakes when diagnosing the P2555 code

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.

How serious is the P2555 code?

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.

What repairs can fix the P2555 code?

Possible fixes for this DTC include:

  • Repairing any shorts or opens in the FICM wiring and connectors
  • Disconnecting the FICM and closely examining all connections and pins to be sure they’re seated correctly
  • Replacing malfunctioning fuel injectors
  • Replacing the FICM or PCM

Additional comments for consideration regarding the P2555 code

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.

Need help with a P2555 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

P2555
trouble codes
Check Engine Light

No more waiting rooms! Our mechanics will come to you to diagnose and fix the P2555 code.

Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.8/5

Number of Reviews

5,754

Rating Summary
5,319
212
50
34
139
5,319
212
50
34
139

Victor

34 years of experience
134 reviews
Victor
34 years of experience
Ford F-150 - Check Engine Light is on - Albuquerque, New Mexico
Awesome mechanic! Very thorough in explaining what the possibilities are and where to start from in regards to getting out truck in to shape. Love the ability to have a mechanic come to you, especially with a young family. Highly recommend!

Paul

18 years of experience
238 reviews
Paul
18 years of experience
Nissan 370Z - Check Engine Light is on - Tampa, Florida
Paul was amazing really good guy very informative and really profesional confirmed it was my o2 sensors and check to make sure everything else was good. Will recommend to everyone!!

Mohammed

8 years of experience
152 reviews
Mohammed
8 years of experience
Ford F-150 - Check Engine Light is on - Morrisville, North Carolina
Mohammed is a great mechanic and a great guy. Very thorough, professional, and a funny guy. I would recommend him to anyone. Thank you!

Kyle

11 years of experience
58 reviews
Kyle
11 years of experience
Ford Focus - Check Engine Light is on - Las Vegas, Nevada
Excellent experience. Kyle was very friendly and resolved the problem fast with a reasonable quote.


More related articles

P0179 OBD-II Trouble Code: Fuel Composition Sensor Circuit High Input
P0179 P0179 code definition Fuel Composition Sensor Circuit High Input What the P0179 code means P0179 is a generic OBD-II code that is triggered by high input from the diesel fuel sensor, typically indicating a shorted circuit in the sensor....
The 10 Transmission Problems to Never Ignore
There’s nothing quite like transmission problems to stress out the average car owner. They are, at best, inconvenient and, at worst, very expensive. Proper...
P0125 OBD-II Trouble Code: Insufficient Coolant Temperature for Closed Loop Fuel Control
P0125 code definition Insufficient Coolant Temperature For Closed Loop Fuel Control What the P0125 code means P0125 is the OBD-II generic...

Related questions

P06DD code came on what does that mean

The Code refers to the dual stage oil pump that your car has. One reported fix has been to simply use the OEM (dealer supplied) oil filter as opposed to aftermarket filters. Among the other possible causes of the code...

The computer for my car says it's EGR flow and there is no other symptoms. What you think?

Either the EGR (Exhaust Gas Recirculation) valve is stuck open or is closed and not opening. First try removing the EGR valve and cleaning it out. Then see if the engine light goes out and the engine runs good. If...

Car won't accelerate past 3000rpm

This issue could be caused by a variety of things. I would suggest by checking to be sure that the idle air control module is working properly. Also, check to be sure that the throttle body is delivering...

How can we help?

Our service team is available 7 days a week, Monday - Friday from 6 AM to 5 PM PST, Saturday - Sunday 7 AM - 4 PM PST.

1 (855) 347-2779 · hi@yourmechanic.com