AutoCodes – Honda – P1684 Honda

P1684 Honda Code - Throttle Valve Return Spring Performance Problem

Quick Answer

The Electronic Throttle Control System (ETCS) controls the throttle valve opening. Common causes include Dirty throttle body, Faulty Electronic Throttle Control System (ETCS), Electronic Throttle Control System (ETCS) harness is open or shorted. 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: P1684 Honda indicates Throttle Valve Return Spring Performance Problem.
Common causes: Common causes include Dirty throttle body, Faulty Electronic Throttle Control System (ETCS), Electronic Throttle Control System (ETCS) harness is open or shorted.
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 20,734

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 Oct 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1684 Honda Description

The Electronic Throttle Control System (ETCS) controls the throttle valve opening. The system is composed of the throttle actuator, the throttle valve, throttle position (TP) sensors A and B, the throttle actuator control module, the throttle actuator control module relay, the accelerator pedal position (APP) sensor, and the Engine Control Module (ECM).
The APP sensor is operated via the throttle cable to determine the accelerator opening value when the driver presses the accelerator pedal. The accelerator pedal opening value is converted to a signal in the APP sensor and transmitted to the ECM to compute the target position. The target position signal is then transmitted to the throttle actuator control module.
The throttle actuator control module determines the throttle valve target position according to the signal received and operates the throttle actuator to move the throttle valve to the target position. The actual throttle valve position is determined by TP sensor A installed in the throttle body.
The throttle actuator control module compares the throttle valve target opening angle and the actual throttle valve opening angle from TP sensor A, and when the difference exceeds the specification, the throttle actuator control module transmits the malfunction data to the ECM. When the ECM receives the malfunction data from the throttle actuator control module,the ECM detects the malfunction of the throttle actuator system and a DTC is stored.

OBDII Code P1684 Honda - Throttle Valve Return Spring Performance Problem - AutoCodes.com — P1684 Honda Code - Throttle Valve Return Spring Performance Problem

What does this mean?

What are the Possible Causes of the DTC P1684 Honda?

Dirty throttle body
Faulty Electronic Throttle Control System (ETCS)
Electronic Throttle Control System (ETCS) harness is open or shorted
Electronic Throttle Control System (ETCS) circuit poor electrical connection

How to Fix the DTC P1684 Honda?

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 P1684 Honda 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 P1684 Honda code?

Need more information on how to fix the P1684 Honda code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1684 Honda code diagnosed by a professional: Find a repair shop in your area

Information for Specific Honda Models

P1684 2008 Honda Accord — Throttle Valve Return Spring Performance Problem
P1684 2009 Honda Accord — Throttle Valve Return Spring Performance Problem
P1684 2010 Honda Accord — Throttle Valve Return Spring Performance Problem

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 P1684 Honda Code

1. What are the common symptoms of OBDII code P1684 in a Honda related to the Throttle Valve Return Spring Performance Problem?

- Common symptoms include rough idling, engine stalling, decreased fuel efficiency, and potential difficulty accelerating.

2. What can cause the OBDII code P1684 in a Honda related to the Throttle Valve Return Spring Performance Problem?

- The code can be triggered by a faulty throttle valve return spring, a malfunctioning throttle body, or issues with the throttle position sensor.

3. How serious is the Throttle Valve Return Spring Performance Problem indicated by OBDII code P1684 in a Honda?

- This issue can affect drivability and fuel efficiency, so it is important to address it promptly to prevent further damage to the engine or related components.

4. Can I continue driving my Honda with the OBDII code P1684 related to the Throttle Valve Return Spring Performance Problem?

- It is not recommended to keep driving the vehicle with this issue, as it can lead to more severe problems and potential safety hazards.

5. How can I repair the Throttle Valve Return Spring Performance Problem causing OBDII code P1684 in my Honda?

- Repair often involves inspecting and potentially replacing the throttle valve return spring, cleaning or replacing the throttle body, and resetting the throttle position sensor.

6. Will resetting the OBDII code P1684 related to the Throttle Valve Return Spring Performance Problem fix the issue in my Honda?

- Resetting the code may temporarily clear the warning light, but it is crucial to address the underlying problem to prevent it from reoccurring.

7. Is it possible to prevent the OBDII code P1684 related to the Throttle Valve Return Spring Performance Problem in my Honda?

- Regular maintenance, such as cleaning the throttle body and checking the throttle valve return spring, can help prevent this issue from occurring.

8. Can a DIY enthusiast fix the OBDII code P1684 related to the Throttle Valve Return Spring Performance Problem in a Honda?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address this issue, but it is recommended to consult a professional for proper diagnosis and repair.

9. How much does it typically cost to repair the Throttle Valve Return Spring Performance Problem causing OBDII code P1684 in a Honda?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it may range from a few hundred to over a thousand dollars.

10. Can the OBDII code P1684 related to the Throttle Valve Return Spring Performance Problem affect the overall performance of my Honda?

- Yes, this issue can impact the engine's performance, fuel efficiency, and drivability, so it is essential to address it promptly to maintain the vehicle's optimal operation.