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Engine-Codes – Generic – P1684

P1684 Code - Battery Power To Module Disconnected

Quick Answer

The diagnostic trouble code P1684 indicates that there has been a disconnection of battery power to a module within the vehicle. Common causes include Loose or corroded battery connections, Faulty battery, Damaged wiring harness. 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 indicates Battery Power To Module Disconnected.
Common causes
Common causes include Loose or corroded battery connections, Faulty battery, Damaged wiring harness.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 13, 2024
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Code P1684 Description

The diagnostic trouble code P1684 indicates that there has been a disconnection of battery power to a module within the vehicle. This code is often associated with a loss of power or communication between the vehicle's various modules and systems. When this occurs, it can lead to a range of issues affecting the vehicle's performance and functionality.

OBDII Code P1684 - Battery Power To Module Disconnected
P1684 Code - Battery Power To Module Disconnected

Common Causes of P1684

  1. Loose or corroded battery connections.
  2. Faulty battery.
  3. Damaged wiring harness.
  4. Defective module.
  5. Electrical system issues.

Symptoms of P1684

  1. Check engine light illuminated on the dashboard.
  2. Difficulty starting the vehicle.
  3. Erratic engine performance, such as rough idling or stalling.
  4. Poor fuel economy.
  5. Loss of power or responsiveness while driving.

How to Fix P1684

  1. Begin by checking the battery connections for any looseness or corrosion. Clean and tighten the connections as needed.
  2. Inspect the battery for any signs of damage or wear. Replace the battery if necessary.
  3. Check the wiring harness for any visible damage or fraying. Repair or replace any damaged wiring.
  4. Test the module for functionality and replace it if it is found to be defective.
  5. If the issue persists, consult a professional mechanic to diagnose and repair any underlying electrical system problems.

Cost to Fix P1684

The typical repair costs for addressing a P1684 code can vary depending on the specific cause of the issue. In general, the cost of parts such as a new battery or module, along with labor for diagnosis and repair, can range from $100 to $500. However, it's important to note that labor rates at auto repair shops can vary widely, so it's advisable to check local rates for a more accurate estimate. Additionally, the cost may be higher if the underlying issue requires more extensive repairs or component replacements.

What does this mean?

Tech Notes for P1684

If other codes are present, check and repair other codes first. Make sure the battery charge is OK and the battery connectors are firmly secure.

Need more information about the P1684 code?

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Code P1684 Information for Specific Makes

  • P1684 Acura — Throttle Valve Return Spring Performance Problem
  • P1684 Buick — Transmission Control Module Power Up Temperature Sensor Performance
  • P1684 Cadillac — Transmission Control Module Power Up Temperature Sensor Performance
  • P1684 Chevrolet — Transmission Control Module Power Up Temperature Sensor Performance
  • P1684 Chrysler — Battery Power To Module Disconnected
  • P1684 Dodge — Battery Power To Module Disconnected
  • P1684 GMC — Transmission Control Module Power Up Temperature Sensor Performance
  • P1684 Honda — Throttle Valve Return Spring Performance Problem
  • P1684 Jeep — Battery Power To Module Disconnected
  • P1684 Pontiac — Transmission Control Module Power Up Temperature Sensor Performance
  • P1684 Saturn — Transmission Control Module Power Up Temperature Sensor Performance
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.

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