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

Our certified mechanics come to you · 12-month, 12,000-mile warranty

SCHEDULE P2555 DIAGNOSTIC 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 $70.00. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $30.00 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$70.00$30.00
Toyota$70.00$30.00
BMW$70.00$30.00
SCHEDULE P2555 DIAGNOSTIC Get a fair and transparent estimate upfront

check engine light

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

Fast and easy Check Engine Light is on Inspection service at your home or office.

SCHEDULE P2555 DIAGNOSTIC
Get a fair and transparent estimate upfront

Recent Check Engine Light is on Inspection reviews

Excellent Rating


YourMechanic Check Engine Light is on Inspection Service

Average Rating

4.5/5

Number of Reviews

3,696

Rating Summary
3,372
162
42
24
96
3,372
162
42
24
96

Jeffrey

24 years of experience
683 reviews
Jeffrey
24 years of experience
Jeffrey arrived on time, maybe even a little early! He got right to the problem of the car not starting and got it started without a problem (we tried unsuccessfully to jump start it before setting the appointment). Jeffrey was very helpful and we already have another appointment set to get a new battery in one car and to have the oil changed in our other one. Our first experience with YourMechanic and Jeffrey was excellent.
2007 CADILLAC DTS - CHECK ENGINE LIGHT IS ON - CHARLOTTE, NORTH CAROLINA

Charles

31 years of experience
227 reviews
Charles
31 years of experience
Took the proper steps to handle my situation with my vehicle in a timely manner.
2010 BUICK ENCLAVE - CHECK ENGINE LIGHT IS ON - AUSTIN, TEXAS

Chet

38 years of experience
393 reviews
Chet
38 years of experience
Really good.
2003 BMW Z4 - CHECK ENGINE LIGHT IS ON - CHULA VISTA, CALIFORNIA

Peter

40 years of experience
1059 reviews
Peter
40 years of experience
Peter was so knowledgeable and courteous. He took the time to explain everything he was doing, which really put me at ease. I hope he's my mechanic from now on!
2009 CHEVROLET AVEO5 - CHECK ENGINE LIGHT IS ON - PHOENIX, ARIZONA

More related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
How to Get a Louisiana Driver's Permit
s licensing program. The first step in this program is to obtain...
Veteran and Military Driver Laws and Benefits in New Mexico
The state of New Mexico offers a number of benefits and perks for those Americans who have either served in an Armed Forces branch...

Related questions

Q: Step by step troubleshooting of DTC fault codes

Each of these codes are for different components and since you swapped the motor with a different size motor than what the car had may be a big problem. You would need to have each code diagnosed separately to see...

Q: Which sensors are most important for monitoring and improving the engine’s performance?

The way modern electronic engine control systems are designed, all of the sensors are important but some are more crucial to the vehicle than others. For example, if the engine electronic control unit (ECU) loses the input from the coolant...

Q: Not sure if I messed up my engine

Hello Sir, From the symptoms you describe it would not appear to me that you have messed up your engine. Usually a Check Engine Light that is flashing means that there is a problem with the vehicle that is...

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.

1-800-701-6230 · hi@yourmechanic.com