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AutoCodes - Generic - P1684

P1684 Code - Battery Power To Module Disconnected

- Code Popularity: 26,989 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
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What are the Possible Causes of the DTC P1684?

NOTE: The causes shown may not be a complete list of all potential problems, and it is possible that there may be other causes.
  • 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
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How to Fix the DTC P1684?

Review the 'Possible Causes' mentioned above and visually examine the corresponding wiring harness and connectors. Ensure to check for any damaged components and inspect the connector pins for signs of being broken, bent, pushed out, or corroded.

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.

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What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1684 code, it typically requires 1.0 hour of labor. The specific diagnosis time and labor rates at auto repair shops can differ based on factors such as the location, make and model of the vehicle, and even the engine type. It is common for most auto repair shops to charge between $75 and $150 per hour.

What are Code Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P1684 Description

The Diagnostic Trouble Code (DTC) P1684 will set when the Transmission Control Module (TCM) is disconnected from battery voltage or ground. 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 - Battery Power To Module Disconnected - AutoCodes.com
P1684 Code - Battery Power To Module Disconnected

Need More Information on the Code?

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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

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Code P1684 comments

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