P2553 OBD-II Trouble Code: Throttle/Fuel Inhibit Circuit Range/Performance

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P2553 code definition

The P2553 OBD-II fault code means the Engine Control Module (ECM) has detected an issue with the the throttle or fuel inhibitor circuit, causing a voltage reading more than 10 percent outside of accepted parameters to register. This trouble code is most frequently associated with diesel-powered vehicles.

What the P2553 code means

While the P2553 trouble code simply indicates there is a voltage abnormality in the throttle or fuel inhibitor circuit, this abnormality is likely caused by a problem in the fuel injection system.

What causes the P2553 code?

An issue in the operation of the fuel injection system - usually within a diesel-powered vehicle - is often at the root of the P2553 code being registered. The ECM detects a fuel injection system related voltage abnormality and illuminates the Check Engine Light on the vehicle’s dashboard.

What are the symptoms of the P2553 code?

When the P2553 code triggers the Check Engine Light to come on, there may also be other symptoms, including:

  • Engine misfire
  • NO-START condition

How does a mechanic diagnose the P2553 code?

Qualified mechanics have been trained in the use of a specialized scan tool differing from those in technological capabilities of scan tools found in auto parts stores. Such a specialized scan tool is only distributed to certified technicians, and this tool is used to collect and interpret data from the ECM. The mechanic then uses this information to narrow down possible causes of the P2553 code registering and performs a visual inspection of the most likely culprits.

Once the root problem has been identified and repaired, the mechanic may then perform other tests, including another scan, to be sure the issue has been resolved.

Common mistakes when diagnosing the P2553 code

Some of the most frequently made mistakes made in diagnostic efforts after the P2565 code has registered include:

  • Neglecting to verify a voltage abnormality with the fuel injection system

  • Failing to perform a thorough visual inspection of fuel injection system and related components

  • Failure to clear the P2553 OBD-II fault code after making repairs

  • Making unnecessary adjustments or repairs to the fuel supply system

How serious is the P2553 code?

Since the P2553 code can trigger a NO-START condition in on-board computer of a vehicle, meaning the computer deems it is unsafe to allow the engine to start, this trouble code is quite serious. Even if the vehicle registers this code and still runs, there is no guarantee that it will continue to start or that other systems may be negatively impacted over time. It is, therefore, advisable to seek immediate assistance from a qualified mechanic.

What repairs can fix the P2553 code?

One the P2553 code has been validated by a certified mechanic, one or more of the following repairs may be necessary to permanently resolve the issue:

  • Repair damaged circuitry related to the fuel injection system
  • Replacing the fuel injection control module main connector
  • Replacing a defective fuel injector

Additional comments for consideration regarding the P2553 code

Whenever OBD-II trouble codes register, don’t be surprised if diagnosing the issue takes time. Multiple tests may be in order, and most mechanics will want to retest once repairs have been made to ensure the issue has been resolved. It is worth taking the extra time to be thorough because it may prevent further issues down the road that can be inconvenient and costly.

Also, bear in mind that the problems surrounding the P2553 code being registered often mimic problems with the fuel supply system. Making repairs or adjustments to the fuel supply system alone, therefore, may not solve the root problem. Simply performing another scan after making any repairs may help to ensure the P2553 trouble code does not reappear.

Need help with a P2553 code?

A service advisor at YourMechanic can connect you with a qualified technician knowledgeable about the diagnosis and repair of vehicles registering the P2553 code. Such a technician can even come to you to perform needed services. Get a quote and book a consultation online or speak with a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

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