P0121 2016 GMC Sierra Code - Throttle Position Sensor 1 Performance
Quick Answer
The Throttle Body Assembly contains a contact-less inductive throttle position sensing element that is managed by a customized integrated circuit. Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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
- P0121 2016 GMC Sierra indicates Throttle Position Sensor 1 Performance.
- Common causes
- Common causes include Faulty Throttle Body Assembly, Throttle Body Assembly harness is open or shorted, Throttle Body Assembly 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 P0121 2016 GMC Sierra Description
What are the Possible Causes of the DTC P0121 2016 GMC Sierra?
- Faulty Throttle Body Assembly
- Throttle Body Assembly harness is open or shorted
- Throttle Body Assembly circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P0121 2016 GMC Sierra?
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 P0121 2016 GMC Sierra 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 P0121 2016 GMC Sierra Code
What does the OBDII code P0121 mean on a 2016 GMC Sierra?
P0121 indicates a problem with the throttle position sensor (TPS) 1, specifically a performance issue where the sensor's signal is outside the expected range.
What are the symptoms of code P0121 on a 2016 GMC Sierra?
Common symptoms include poor acceleration, hesitation, stalling, reduced fuel efficiency, and the illumination of the check engine light.
What causes the P0121 code on a 2016 GMC Sierra?
Causes may include a faulty throttle position sensor, damaged wiring or connectors, a dirty or malfunctioning throttle body, or issues within the engine control module (ECM).
Can driving with code P0121 damage my 2016 GMC Sierra?
Driving with this code can lead to poor engine performance and potential stalling, which may increase the risk of an unsafe driving situation. Prompt diagnosis and repair are recommended.
How do I diagnose the P0121 code on a 2016 GMC Sierra?
Diagnosis involves checking the throttle position sensor and its wiring, inspecting the throttle body for dirt or damage, and using a scan tool to monitor TPS voltage readings.
Is replacing the throttle position sensor the only fix for code P0121?
Not necessarily. Other fixes may include repairing damaged wiring, cleaning the throttle body, or reprogramming or replacing the ECM if needed.
How much does it cost to fix code P0121 on a 2016 GMC Sierra?
The cost varies depending on the repair. Replacing a throttle position sensor may cost $100-$300, while cleaning the throttle body or repairing wiring might be less expensive.
Can a dirty throttle body cause the P0121 code on a 2016 GMC Sierra?
Yes, a dirty or clogged throttle body can disrupt airflow and TPS readings, potentially triggering this code.
How can I prevent code P0121 from recurring on my 2016 GMC Sierra?
Regular maintenance, including cleaning the throttle body and inspecting wiring and connectors, can help prevent this code from occurring.
What tools are needed to fix code P0121 on a 2016 GMC Sierra?
You may need a scan tool, multimeter, throttle body cleaner, and basic hand tools like screwdrivers and wrenches for diagnosis and repair.
Discuss the causes and fixes for P0121 2016 GMC Sierra OBDII Code
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