AutoCodes – Buick – P2555 Buick

P2555 Buick Code - Throttle Actuator Control Inhibit Circuit High Voltage

Quick Answer

The Powertrain Control Module (PCM) receives Accelerator Pedal Position (APP) sensor information and calculates the desired throttle position. Common causes include Faulty Throttle Control Actuator (TAC) module (part of the Throttle Body Assembly), Throttle Control Actuator Module harness is open or shorted, Throttle Control Actuator Module circuit poor electrical connection. 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 Buick indicates Throttle Actuator Control Inhibit Circuit High Voltage.
Common causes: Common causes include Faulty Throttle Control Actuator (TAC) module (part of the Throttle Body Assembly), Throttle Control Actuator Module harness is open or shorted, Throttle Control Actuator Module circuit poor electrical connection.
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.

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Code Popularity 159

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 13, 2024

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P2555 Buick Description

The Powertrain Control Module (PCM) receives Accelerator Pedal Position (APP) sensor information and calculates the desired throttle position. The PCM sends this desired throttle position or target value to the Throttle Control Actuator (TAC) module. The TAC module achieves the desired throttle position by commanding the throttle control motor to position the throttle valve at the target value. The TAC module then compares the throttle position (TP) sensor 1 value to the target value. If necessary, the throttle control motor is moved slightly in order to obtain the exact target value position. If the TAC motor control circuit voltage is too high, DTC P2555 sets. The TAC motor and circuitry are integral parts of the TAC module and are not serviced separately. The TAC module is not serviceable and must be replaced with the throttle body assembly.

OBDII Code P2555 Buick - Throttle Actuator Control Inhibit Circuit High Voltage - AutoCodes.com — P2555 Buick Code - Throttle Actuator Control Inhibit Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2555 Buick?

Faulty Throttle Control Actuator (TAC) module (part of the Throttle Body Assembly)
Throttle Control Actuator Module harness is open or shorted
Throttle Control Actuator Module circuit poor electrical connection

How to Fix the DTC P2555 Buick?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P2555 Buick code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 Buick Code

What does the OBDII code P2555 mean on a Buick?

Code P2555 indicates a "Throttle Actuator Control Inhibit Circuit High Voltage," meaning the vehicle's throttle actuator control system has detected an abnormally high voltage in the inhibit circuit.

What are the common symptoms of code P2555 in a Buick?

Symptoms may include reduced engine performance, a lack of throttle response, the illumination of the check engine light, and potentially entering a "limp mode."

What causes code P2555 to trigger in a Buick?

Common causes include a faulty throttle actuator control module, damaged wiring or connectors in the circuit, a malfunctioning throttle body, or issues with the vehicleâ€™s powertrain control module (PCM).

How can I diagnose code P2555 on my Buick?

Begin by inspecting the wiring and connectors related to the throttle actuator control. Use a multimeter to check for high voltage in the circuit, and scan the system for additional codes that might indicate related issues.

Can I drive my Buick with code P2555 active?

Itâ€™s not recommended to drive with this code active, as it could lead to reduced performance or unsafe driving conditions due to limited throttle control.

How do I fix code P2555 in my Buick?

Repairs may include replacing damaged wiring or connectors, repairing or replacing the throttle actuator control module, cleaning or replacing the throttle body, or updating/reprogramming the PCM.

How much does it cost to fix code P2555 on a Buick?

Repair costs vary depending on the issue, but fixing wiring or connectors may cost $50â€“$150, while replacing a throttle body or module can range from $300â€“$1,000.

Can a dirty throttle body cause code P2555?

Yes, a dirty or malfunctioning throttle body can cause issues with the throttle actuator control system and trigger code P2555.

Does code P2555 require specialized tools to repair?

For diagnosis and repair, you may need a multimeter, a scan tool capable of reading live data, and possibly tools to clean or replace the throttle body or control components.

Will clearing the code P2555 fix the problem?

Clearing the code may temporarily turn off the check engine light, but the underlying issue must be resolved to prevent the code from returning.