AutoCodes – Generic – P2555

P2555 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 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 6,046

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

What does this mean?

What are the Possible Causes of the DTC P2555?

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?

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 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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Information for Specific Makes

P2555 Buick — Throttle Actuator Control Inhibit Circuit High Voltage
P2555 Cadillac — Throttle Actuator Control Inhibit Circuit High Voltage
P2555 Chevrolet — Throttle Actuator Control Inhibit Circuit High Voltage
P2555 Dodge — Throttle/Fuel Inhibit Circuit High
P2555 Ford — Throttle/Fuel Inhibit Circuit High
P2555 GMC — Throttle Actuator Control Inhibit Circuit High Voltage
P2555 Saturn — Throttle Actuator Control Inhibit Circuit High Voltage

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.