P2105 Buick Code - Throttle Actuator Control System - Forced Engine Shutdown
Quick Answer
The Throttle Actuator Control (TAC) system uses vehicle electronics and components to calculate and control the position of the throttle blade. Common causes include Faulty Throttle Actuator Control (TAC), Throttle Actuator Control (TAC) harness is open or shorted, Throttle Actuator Control (TAC) 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
- P2105 Buick indicates Throttle Actuator Control System - Forced Engine Shutdown.
- Common causes
- Common causes include Faulty Throttle Actuator Control (TAC), Throttle Actuator Control (TAC) harness is open or shorted, Throttle Actuator Control (TAC) 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.
Code P2105 Buick Description
The TAC system components include, but are not limited to the following:
- The accelerator pedal position (APP) sensors
- The throttle body
- The Powertrain Control Module (PCM)
Each of these components interface together to ensure accurate calculations and control of the throttle position (TP).
Throttle Body Assembly
The throttle body for the throttle actuator control (TAC) system is similar to a conventional throttle body with several exceptions. One exception being the use of a motor to control the throttle position instead of a mechanical cable. Another exception is the throttle position (TP) sensor. The TP sensor is mounted in the throttle body assembly. The TP sensor is 2 individual TP sensors within the throttle body assembly. Two separate signal, low reference, and 5-volt reference circuits are used to connect the TP sensors and the Powertrain Control Module (PCM). TP sensor 2 signal voltage increases as the throttle opens. TP sensor 1 signal voltage decreases as the throttle opens.
What are the Possible Causes of the DTC P2105 Buick?
- Faulty Throttle Actuator Control (TAC)
- Throttle Actuator Control (TAC) harness is open or shorted
- Throttle Actuator Control (TAC) circuit poor electrical connection
How to Fix the DTC P2105 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2105 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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Frequently Asked Questions about P2105 Buick Code
What does the OBDII code P2105 mean for a Buick?
Code P2105 indicates that the throttle actuator control system has triggered a forced engine shutdown due to a detected malfunction or safety concern.
What are the common symptoms of the P2105 code?
Symptoms may include the engine shutting off unexpectedly, reduced engine power, poor acceleration, or the Check Engine Light illuminating.
What causes the P2105 code to appear?
Common causes include a faulty throttle body, damaged throttle position sensor, wiring issues, or a malfunction in the engine control module (ECM).
Can I drive my Buick with the P2105 code active?
It is not recommended to drive with this code, as the vehicle may stall unexpectedly, posing a safety risk.
How is the P2105 code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the throttle body and related components, check for wiring issues, and test the throttle actuator control system.
What repairs can fix the P2105 code?
Repairs may include cleaning or replacing the throttle body, repairing damaged wiring, replacing the throttle position sensor, or reprogramming the ECM.
Does the P2105 code always require throttle body replacement?
No, sometimes cleaning the throttle body or repairing wiring and connections can resolve the issue without replacing the throttle body.
Can a dead battery cause the P2105 code to appear?
A weak or dead battery may disrupt the throttle actuator system, but the code more commonly stems from issues within the throttle system itself.
How much does it cost to fix the P2105 code on a Buick?
Repair costs vary, but throttle body cleaning or replacement can range from $150 to $600, depending on labor rates and parts.
Can ignoring the P2105 code damage my Buick?
Yes, ignoring the code may lead to further damage to the throttle system or engine and increase the risk of unsafe driving conditions.
Discuss the causes and fixes for P2105 Buick OBDII Code
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