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Engine-Codes – GMC – P2555 GMC

P2555 GMC Code - Throttle Actuator Control Inhibit Circuit High Voltage

Quick Answer

The P2555 GMC code indicates a problem with the throttle actuator control inhibit circuit, specifically that the voltage is too high. Common causes include Faulty throttle actuator control module, Issues with wiring or connectors in the circuit, Corrosion or damage to electrical connections. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2555 GMC indicates Throttle Actuator Control Inhibit Circuit High Voltage.
Common causes
Common causes include Faulty throttle actuator control module, Issues with wiring or connectors in the circuit, Corrosion or damage to electrical connections.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code P2555 GMC Description

The P2555 GMC code indicates a problem with the throttle actuator control inhibit circuit, specifically that the voltage is too high. The throttle actuator control system is responsible for managing the throttle opening in response to driver input. When the circuit voltage is too high, it can lead to issues with throttle response and overall engine performance. This can result in poor acceleration, rough idling, and potential stalling. If not addressed, it can lead to further damage to the engine and other components of the vehicle.

OBDII Code P2555 GMC - Throttle Actuator Control Inhibit Circuit High Voltage
P2555 GMC Code - Throttle Actuator Control Inhibit Circuit High Voltage

Common Causes of P2555 GMC

  1. Faulty throttle actuator control module
  2. Issues with wiring or connectors in the circuit
  3. Corrosion or damage to electrical connections
  4. Powertrain Control Module (PCM) malfunction
  5. Sensor or throttle position sensor failure

Symptoms of P2555 GMC

  1. Loss of power or reduced acceleration
  2. Engine stalling or rough idling
  3. Check Engine Light illuminated
  4. Vehicle going into "limp mode" (limited performance mode)
  5. Difficulty starting the engine

How to Fix P2555 GMC

  1. Begin by inspecting the wiring and connectors for any damage or corrosion. Repair or replace as necessary.
  2. Test the throttle actuator control module and throttle position sensor for proper function. Replace any components that are faulty.
  3. Clear the diagnostic trouble codes and reset the system.
  4. Perform a thorough test drive to ensure the issue has been resolved.
  5. If the problem persists, consult a professional mechanic for further diagnosis and repair.

Cost to Fix P2555 GMC

The cost of repairing a throttle actuator control inhibit circuit high voltage issue can vary depending on the specific cause of the problem. In general, the cost can range from $200 to $500 for parts and labor. However, it's important to note that labor rates at auto repair shops can vary, so it's recommended to obtain quotes from multiple shops in your area. Additionally, the cost may be higher if more extensive repairs are needed or if specialized parts are required.

What does this mean?

Tech Notes for P2555 GMC

The Throttle Control Actuator (TAC) module is part of the Throttle Body Assembly and is not serviceable. The Throttle Body Assembly needs to be replaced to fix the problem.

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2555 GMC Code

1. What are the common symptoms of OBDII code P2555 GMC (Throttle Actuator Control Inhibit Circuit High Voltage)?

The common symptoms of P2555 include reduced engine power, illuminated Check Engine Light (CEL), and potential difficulty accelerating.

2. What could cause OBDII code P2555 (Throttle Actuator Control Inhibit Circuit High Voltage) in a GMC vehicle?

Possible causes of P2555 can include a faulty throttle actuator control module, damaged wiring or connectors in the throttle actuator circuit, or a problem with the throttle body itself.

3. How serious is OBDII code P2555 GMC (Throttle Actuator Control Inhibit Circuit High Voltage)?

P2555 should be addressed promptly as it can affect the performance and drivability of the vehicle. Continuing to drive with this code present may lead to further damage or safety issues.

4. Can I continue driving my GMC with OBDII code P2555 present?

It is not recommended to drive your vehicle with P2555 active, as it may result in reduced engine power and potentially unsafe driving conditions. It is best to address the issue as soon as possible.

5. How can I diagnose and repair OBDII code P2555 (Throttle Actuator Control Inhibit Circuit High Voltage) in my GMC?

Diagnosing P2555 typically involves using a scan tool to retrieve the code and then inspecting the throttle actuator components, wiring, and connectors for any visible damage. Repair may involve replacing faulty components or repairing damaged wiring.

6. Is it possible to reset OBDII code P2555 in a GMC without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is not recommended to do so without addressing the root cause. The code is likely to reappear if the underlying problem is not fixed.

7. How much does it cost to repair OBDII code P2555 in a GMC vehicle?

The cost of repairing P2555 can vary depending on the specific issue causing the code, the labor rates of the repair shop, and the cost of any replacement parts needed. It is recommended to get a diagnosis and estimate from a qualified mechanic.

8. Can a DIY enthusiast fix OBDII code P2555 in a GMC at home?

Diagnosing and repairing P2555 may require specialized tools and knowledge, so it is recommended to consult a professional mechanic. However, if you have experience with automotive repairs and the necessary tools, you may be able to address the issue at home.

9. Will OBDII code P2555 (Throttle Actuator Control Inhibit Circuit High Voltage) cause permanent damage to my GMC if left unresolved?

Leaving P2555 unresolved can potentially lead to further issues with the throttle system and may result in more severe damage over time. It is best to address the code promptly to prevent any long-term damage.

10. How long does it typically take to repair OBDII code P2555 in a GMC?

The repair time for P2555 can vary depending on the exact cause of the code and the availability of parts. In some cases, the repair may be completed within a few hours, while more complex issues may take longer to diagnose and fix.

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