Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
Your car's computer is having trouble understanding how much you're pressing the gas pedal.
The code P1686 indicates a problem with the electronic throttle control system, specifically with the pedal position sensor, which measures how much the accelerator pedal is pressed.
The P1686 code is triggered when the Electronic Throttle Control (ETC) system detects an error in the pedal position sensor. This sensor sends signals to the engine control module (ECM) to determine the position of the accelerator pedal. If the ECM receives signals that are out of expected range or inconsistent, it sets this code.
• Check engine light is on
• Reduced engine performance
• Unresponsive accelerator pedal
• Engine stalling or hesitation
• Faulty pedal position sensor
• Wiring issues in the throttle control circuit
• Defective throttle body
• ECM malfunction
ECM: Engine Control Module
ETC: Electronic Throttle Control
OBD-II: On-Board Diagnostics, Second Generation
• Scan the vehicle for additional codes
• Inspect the wiring and connectors of the pedal position sensor
• Test the pedal position sensor using a multimeter
• Check the throttle body for any issues
• Replace the pedal position sensor
• Repair or replace damaged wiring
• Replace the throttle body if necessary
• Reprogram or replace the ECM
• OBD-II scanner
• Multimeter
• Screwdriver set
$150 - $500
Moderate
• Dodge Ram
• Jeep Grand Cherokee
• Chrysler 300
• Regularly inspect and maintain the throttle system
• Ensure all electrical connections are secure
• Use quality fuel to prevent throttle body deposits
Sensor Issue
• Do not ignore the check engine light
• Have your vehicle inspected by a professional
• Avoid driving aggressively until the issue is fixed
Check with your vehicle manufacturer for warranty coverage on throttle system components.
The P1686 code has been more common in vehicles with electronic throttle control systems, especially in older models where wear and tear affect sensor accuracy.
Moderate – While the vehicle may still be drivable, it can lead to reduced performance and potential safety issues.
Driving with a malfunctioning throttle control system can be dangerous and may not comply with emissions regulations.
• Engine running
• Vehicle in park or neutral
The pedal position sensor is located near the accelerator pedal assembly.
Q: Can I drive my car with the P1686 code?
A: It's not recommended as it can lead to reduced performance and safety issues.
Q: How can I prevent the P1686 code from appearing?
A: Regular maintenance and inspections of the throttle system can help prevent this code.
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