AutoCodes – Jeep – P1684 Jeep

P1684 Jeep Code - Battery Power To Module Disconnected

Quick Answer

The Diagnostic Trouble Code (DTC) P1684 will set when the Transmission Control Module (TCM) is disconnected from battery voltage or ground. Common causes include Battery was recently disconnected, Low battery voltage, Malfunctioning charging system. 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 Jeep indicates Battery Power To Module Disconnected.
Common causes: Common causes include Battery was recently disconnected, Low battery voltage, Malfunctioning charging system.
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 18,938

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 06, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1684 Jeep Description

The Diagnostic Trouble Code (DTC) P1684 will set when the Transmission Control Module (TCM) is disconnected from battery voltage or ground. The DTC will also set during DRB-III QUICK BATTERY DISCONNECT procedure. The DTC data will be lost. The vehicle will go into immediate limp-in mode if power is lost while operating the vehicle. Normal operation is resumed if the power is restored during the same key start.

OBDII Code P1684 Jeep - Battery Power To Module Disconnected - AutoCodes.com — P1684 Jeep Code - Battery Power To Module Disconnected

What does this mean?

What are the Possible Causes of the DTC P1684 Jeep?

Battery was recently disconnected
Low battery voltage
Malfunctioning charging system
Transmission Control Module (TCM) was replaced or disconnected
Faulty Transmission Control Module (TCM)
Transmission Control Module (TCM) harness is open or shorted
Transmission Control Module (TCM) circuit poor electrical connection

How to Fix the DTC P1684 Jeep?

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 does this mean?

Code Tech Notes

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.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1684 Jeep 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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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 Jeep Code

1. What are the common symptoms of OBDII code P1684 in a Jeep?

- Common symptoms include the engine stalling, difficulty starting the vehicle, and issues with power accessories.

2. What does the OBDII code P1684 in a Jeep indicate?

- The code P1684 indicates that battery power to a module has been disconnected.

3. What are the possible causes of OBDII code P1684 in a Jeep?

- Possible causes include a loose or corroded battery terminal connection, a faulty battery, a damaged battery cable, or a problem with the power distribution center.

4. How can I diagnose the OBDII code P1684 in my Jeep?

- You can start by checking the battery terminals for tightness and corrosion, inspecting the battery cables for damage, and testing the battery's voltage and condition.

5. Can I drive my Jeep with the OBDII code P1684 present?

- It is not recommended to drive your Jeep with the code P1684 present, as it can lead to further electrical issues and potential stalling of the engine.

6. How can I repair OBDII code P1684 in my Jeep?

- To repair the code, you may need to tighten or clean the battery terminals, replace a faulty battery, repair damaged battery cables, or address any issues with the power distribution center.

7. Will resetting the OBDII code P1684 make it go away permanently?

- Resetting the code may temporarily clear it, but if the underlying issue, such as a loose battery connection, is not addressed, the code is likely to reappear.

8. Is it safe to clear the OBDII code P1684 with a code reader?

- It is safe to clear the code with a code reader, but it is important to address the root cause of the issue to prevent further problems.

9. Can a faulty alternator cause the OBDII code P1684 to appear in a Jeep?

- While a faulty alternator can cause electrical issues, the OBDII code P1684 specifically relates to battery power to a module being disconnected.

10. How can I prevent OBDII code P1684 from reoccurring in my Jeep?

- Regularly inspecting and maintaining the battery terminals, cables, and overall electrical system can help prevent the recurrence of the code P1684 in your Jeep.