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 diagnostic for $0.0 . Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.0 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.

Cars Estimate Credit towards follow-up repair Earliest Availability
Ford $0.0 $20.0
Toyota $0.0 $20.0
BMW $0.0 $20.0
SCHEDULE P2555 DIAGNOSTIC Get a fair and transparent estimate upfront

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.

Check Engine Light
trouble codes
P2555

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

SCHEDULE P2555 DIAGNOSTIC
Get a $20 credit for the follow-up repair

Recent Check Engine Light is on Inspection reviews

Excellent Rating

(6688)

Rating Summary
6196
235
54
37
166
6196
235
54
37
166
 at YourMechanic

Leo

18 years of experience
98 reviews
Leo
18 years of experience
Buick Encore L4-1.4L - Check Engine Light is on - Greensboro, North Carolina
Leo was great. Took the time to ensure that I understood what the problem was, and what caused it. He also did not rush the diagnostic.
 at YourMechanic

Angel

5 years of experience
10 reviews
Angel
5 years of experience
BMW 325i L6-2.5L - Check Engine Light is on - Upper Marlboro, Maryland
Knowledgeable, punctual, got right to business. Was done on time and offered great recommendations. Thanks
 at YourMechanic

Raymond

37 years of experience
287 reviews
Raymond
37 years of experience
Cadillac CTS V6-3.6L - Check Engine Light is on - Las Vegas, Nevada
Raymond is extremely knowledgeable and was on time and very cordial. He is someone that will go on our MUST HAVE CONTACTS!! 5 🌟
 at YourMechanic

Theodore

16 years of experience
1448 reviews
Theodore
16 years of experience
Ford F-150 V8-4.6L - Check Engine Light is on - Everett, Washington
Very knowledgeable. Able to explain things in lay person terms. Terrific mechanic. I will use again!


More related articles

P0591 OBD-II Trouble Code: Cruise Control Multi-Function Input "B" Circuit Range/Performance
P0591 code means there is electrical malfunction in the cruise control multi-function input "B" often due too corroded connectors or shorted wiring.
P2446 OBD-II Trouble Code: Secondary Air Injection System Pump Stuck on Bank 2
P2446 code means there is an issue with the vehicles pressure sensor circuit/secondary air injection pump often due too water from exhaust leaks.
P3484 OBD-II Trouble Code: Cylinder 11 Deactivation/Intake Valve Control Circuit High
P3484 code means cylinder 11 was deactivated during certain driving conditions due to low oil pressure, engine condition, or electrical components.

Related questions

Check Engine light revealed thermostat problem

Sounds like you have a code P0128. The computer monitors the warm up cycle of your engine -- it looks for your coolant temperature to rise to a certain level within a given time frame. The computer does this...

The Check Engine Light came up with the code P2017, what do I need to replace?

If you are getting this code it is due to one of two things. The vast majority of the time it is caused by a failure in the variable charge motion actuator, which is the same part that you mentioned....

My honda CRV shows -28 on the screen . What does that mean?

The screen may be displaying a trouble code tied to a fault picked up by the vehicles computers. The code may stand for an item that needs to be reset or an electrical fault. Consider hiring an experienced technician like...

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