AutoCodes – Volvo – P0121 Volvo

P0121 Volvo Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

Quick Answer

This fault code is stored in the engine control module when a malfunction is detected in the throttle control system. Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor 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 Volvo indicates Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance.
Common causes: Common causes include Faulty Throttle Position Sensor, Throttle Position Sensor harness is open or shorted, Throttle Position Sensor 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.

Save to My Repairs Step-by-Step Diagnostic Guide My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 5,280

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Nov 23, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P0121 Volvo Description

This fault code is stored in the engine control module when a malfunction is detected in the throttle control system. The driver demand is sensed via the accelerator pedal position sensor. The engine control module adjusts the throttle position accordingly and the throttle position is returned to the engine control module via the throttle position sensor. European on-board diagnostics (EOBD) compliant vehicles use at least two accelerator pedal position sensors and at least two throttle position sensors for redundancy. Failure of one circuit can easily be identified and vehicle operation will remain unaffected.

OBDII Code P0121 Volvo - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance - AutoCodes.com — P0121 Volvo Code - Throttle/Pedal Position Sensor/Switch 'A' Circuit Range/Performance

What does this mean?

What are the Possible Causes of the DTC P0121 Volvo?

Faulty Throttle Position Sensor
Throttle Position Sensor harness is open or shorted
Throttle Position Sensor circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0121 Volvo?

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 Volvo 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 P0121 Volvo code?

Need more information on how to fix the P0121 Volvo code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0121 Volvo code diagnosed by a professional: Find a repair shop in your area

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0121 Volvo Code

1. What are the common symptoms of OBDII code P0121 in a Volvo?

The common symptoms of OBDII code P0121 in a Volvo include issues with acceleration, reduced engine power, stalling, and illuminated check engine light.

2. What could cause the OBDII code P0121 to appear in a Volvo?

The OBDII code P0121 in a Volvo is typically triggered by a faulty throttle position sensor or throttle pedal position sensor, damaged wiring, or a problem with the electronic throttle control system.

3. How can I diagnose the OBDII code P0121 in my Volvo?

To diagnose the OBDII code P0121 in your Volvo, you can use a diagnostic scanner to retrieve the code, inspect the throttle position sensor and pedal position sensor for any signs of damage or wear, and check the wiring connections for any issues.

4. Can I drive my Volvo with OBDII code P0121?

It is not recommended to drive your Volvo with OBDII code P0121, as it can lead to performance issues, stalling, and potential safety hazards. It is best to address the underlying problem promptly.

5. What are some repair tips for fixing OBDII code P0121 in a Volvo?

Repair tips for fixing OBDII code P0121 in a Volvo include replacing the faulty throttle position sensor or pedal position sensor, repairing damaged wiring connections, and ensuring proper calibration of the sensors.

6. Will resetting the OBDII code P0121 in my Volvo solve the issue?

Resetting the OBDII code P0121 in your Volvo may temporarily turn off the check engine light, but the underlying problem causing the code will persist. It is important to diagnose and address the root cause of the issue.

7. How much does it cost to repair OBDII code P0121 in a Volvo?

The cost to repair OBDII code P0121 in a Volvo can vary depending on the extent of the issue, the parts needed for replacement, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

8. Can a DIY enthusiast fix OBDII code P0121 in a Volvo?

While some DIY enthusiasts may have the skills to address OBDII code P0121 in a Volvo by replacing sensors or checking wiring connections, it is recommended to seek professional help for accurate diagnosis and repair.

9. How long does it take to repair OBDII code P0121 in a Volvo?

The repair time for OBDII code P0121 in a Volvo can vary based on the complexity of the issue and the availability of parts. In general, it may take a few hours to a day for a mechanic to diagnose and fix the problem.

10. Is OBDII code P0121 a common issue in Volvo vehicles?

OBDII code P0121 related to the throttle/pedal position sensor circuit range/performance is a relatively common issue in Volvo vehicles, especially in older models or those with high mileage. Regular maintenance and inspections can help prevent such problems.