P2104 Buick Code - Throttle Actuator Control System - Forced Engine Idle
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
- P2104 Buick indicates Throttle Actuator Control System - Forced Engine Idle.
- 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 P2104 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 P2104 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 P2104 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 P2104 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 P2104 Buick Code
What does the OBDII code P2104 mean for a Buick?
P2104 indicates that the Powertrain Control Module (PCM) has put the throttle actuator control system into forced idle mode to protect the engine or prevent unsafe operation.
What are the common symptoms of code P2104 in a Buick?
Symptoms may include reduced engine power, the engine stuck at idle, a lit check engine light, unresponsive accelerator pedal, or rough idling.
What causes the P2104 code to appear in a Buick?
Common causes include a faulty throttle body, issues with the throttle position sensor, damaged wiring or connectors in the throttle actuator system, or a malfunctioning PCM.
Can I drive my Buick with a P2104 code?
Driving with a P2104 code is not recommended, as the vehicle may have limited power and could enter limp mode, compromising safety and drivability.
How is code P2104 diagnosed in a Buick?
A technician will use a scan tool to check for related codes, inspect the throttle body and wiring, test the throttle position sensor, and verify the PCM’s operation.
Is the P2104 code specific to Buick vehicles?
No, P2104 is a generic OBDII code applicable to many makes and models, but the specific diagnostic and repair procedures may vary by vehicle.
What repairs can fix the P2104 code in a Buick?
Repairs may include cleaning or replacing the throttle body, repairing damaged wiring or connectors, replacing the throttle position sensor, or reprogramming or replacing the PCM.
How much does it cost to repair a P2104 code on a Buick?
Repair costs can vary widely, ranging from $100 for cleaning the throttle body to over $1,000 if the throttle body or PCM needs to be replaced.
Can a dirty throttle body cause a P2104 code in a Buick?
Yes, a dirty or carbon-clogged throttle body can cause the throttle actuator system to malfunction, triggering the P2104 code.
Will clearing the P2104 code fix the issue in my Buick?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.
Discuss the causes and fixes for P2104 Buick OBDII Code
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