AutoCodes – Generic – P2621

P2621 Code - Throttle Position Output Circuit Low

Quick Answer

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the throttle control system. Common causes include Faulty Throttle Position Sensor/Switch, Throttle Position Sensor/Switch harness is open or shorted, Throttle Position Sensor/Switch 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
P2621 indicates Throttle Position Output Circuit Low.
Common causes
Common causes include Faulty Throttle Position Sensor/Switch, Throttle Position Sensor/Switch harness is open or shorted, Throttle Position Sensor/Switch 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.
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Code Popularity 28,535
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Dec 23, 2021
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Code P2621 Description

This fault code is stored in the Engine Control Module (ECM) when a malfunction is detected in the throttle control system. The driver demand is sensed via the Accelerator Pedal Position Sensor. The ECM adjusts the throttle position accordingly and the throttle position is returned to the ECM via the Throttle Position Sensor. Failure of one circuit can easily be identified and vehicle operation will remain unaffected.
OBDII Code P2621 - Throttle Position Output Circuit Low - AutoCodes.com
P2621 Code - Throttle Position Output Circuit Low

What are the Possible Causes of the DTC P2621?

  • Faulty Throttle Position Sensor/Switch
  • Throttle Position Sensor/Switch harness is open or shorted
  • Throttle Position Sensor/Switch circuit poor electrical connection

How to Fix the DTC P2621?

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 P2621 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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Information for Specific Makes

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 P2621 Code

1. What are the common symptoms of OBDII code P2621 (Throttle Position Output Circuit Low)?

The common symptoms include reduced engine power, poor acceleration, stalling, and difficulty maintaining a consistent speed.

2. What are the potential causes of OBDII code P2621?

Possible causes of this code include a faulty throttle position sensor, damaged wiring or connectors in the throttle position sensor circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P2621?

To diagnose the issue, you can use a scan tool to check for the specific error code, inspect the throttle position sensor and its wiring for any visible damage, and test the sensor's output voltage using a multimeter.

4. Can I continue driving my vehicle with OBDII code P2621?

It is not recommended to drive your vehicle with this code as it can lead to further damage and safety risks. It is best to address the issue promptly.

5. How can I repair OBDII code P2621?

Repairing this code typically involves replacing the faulty throttle position sensor, repairing or replacing damaged wiring or connectors, and clearing the error code with a scan tool.

6. Are there any DIY tips for fixing OBDII code P2621?

While some basic troubleshooting like checking for loose connections or damaged wiring can be done DIY, it is recommended to seek professional help for accurately diagnosing and repairing this code.

7. How much does it cost to repair OBDII code P2621?

The cost of repairing this code can vary depending on the extent of the issue, the cost of parts needed for replacement, and labor charges. It is advisable to obtain quotes from different auto repair shops.

8. Can a bad throttle position sensor cause OBDII code P2621?

Yes, a malfunctioning throttle position sensor can cause the ECM to detect a low output signal, triggering OBDII code P2621.

9. Will resetting the ECM clear OBDII code P2621?

Resetting the ECM may temporarily clear the code, but it is likely to return if the underlying issue causing the code is not addressed and repaired.

10. How important is it to address OBDII code P2621 promptly?

It is crucial to address this code promptly to prevent further damage to the engine, ensure safety while driving, and maintain optimal vehicle performance.

Discuss the causes and fixes for P2621 OBDII Code

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