P2104 Saturn 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 Saturn 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 Saturn 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 Saturn?
- 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 Saturn?
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 Saturn 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 Saturn Code
1. What does the OBDII code P2104 mean on a Saturn?
P2104 indicates that the Throttle Actuator Control System has entered a "Forced Engine Idle" state, where the engine is restricted to idle to prevent potential damage.
2. What are the common symptoms of the P2104 code on a Saturn?
Symptoms may include the engine idling but not responding to throttle input, reduced power, a check engine light, and difficulty accelerating.
3. What causes the P2104 code to appear on a Saturn?
Common causes include a malfunctioning throttle body, a faulty throttle position sensor, wiring or connection issues, or problems with the engine control module (ECM).
4. Can I drive my Saturn with the P2104 code?
Driving is typically limited because the vehicle may only idle or operate in a reduced power mode, making it unsafe for normal driving.
5. How is the P2104 code diagnosed in a Saturn?
A mechanic will use a scan tool to check for additional codes, inspect the throttle body and throttle position sensor, and verify the wiring and connections.
6. How do I fix the P2104 code on my Saturn?
Possible fixes include cleaning or replacing the throttle body, repairing damaged wiring, replacing a faulty throttle position sensor, or reprogramming the ECM if needed.
7. Can a dirty throttle body cause the P2104 code?
Yes, carbon buildup in the throttle body can restrict its movement and trigger the P2104 code.
8. Does the P2104 code mean the throttle body needs replacement?
Not always. Cleaning the throttle body or repairing wiring might resolve the issue. Replacement is only necessary if the throttle body is defective.
9. What tools are needed to troubleshoot the P2104 code on a Saturn?
Tools include an OBDII scanner, a multimeter to check electrical connections, and cleaning supplies for the throttle body if buildup is suspected.
10. How much does it cost to repair the P2104 code on a Saturn?
Repair costs vary but can range from $100 for cleaning the throttle body to $500 or more for throttle body replacement or ECM reprogramming.
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