P2104 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 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 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?
- 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?
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 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.
Need more information about the P2104 code?
Need more information on how to fix the P2104 code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P2104 code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P2104 BMW — Throttle Actuator Control System - Forced Idle
- P2104 Buick — Throttle Actuator Control System - Forced Engine Idle
- P2104 Cadillac — Throttle Actuator Control System - Forced Engine Idle
- P2104 Chevrolet — Throttle Actuator Control System - Forced Engine Idle
- P2104 Dodge — Throttle Actuator Control System - Forced Engine Idle
- P2104 Ford — Throttle Actuator Control System Forced Idle
- P2104 GMC — Throttle Actuator Control System - Forced Engine Idle
- P2104 Hyundai — Electronic Throttle Control System Forced Idle
- P2104 Lincoln — Throttle Actuator Control System Forced Idle
- P2104 Mercury — Throttle Actuator Control System Forced Idle
- P2104 Saturn — Throttle Actuator Control System - Forced Engine Idle
Frequently Asked Questions about P2104 Code
No Frequently Asked Questions about P2104 Code found.
Discuss the causes and fixes for P2104 OBDII Code
Code P2104 comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
