Engine-Codes - Generic - P1684

P1684 Code - Battery Power To Module Disconnected

- Code Popularity: 26,985 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 2/3
Table of contents
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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

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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How to Fix the DTC P1684?

Check the 'Possible Causes' listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector pins.

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What is the Cost to Diagnose the Code?

Labor: 1.0

The cost to diagnose the P1684 code is 1.0 hour of labor. The diagnosis time and labor rates at auto repair shops vary depending on the location, make and model of the vehicle, and even the engine type. Most auto repair shops charge between $75 and $150 per hour.

What are Code Possible Symptoms?

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

What Does the P1684 Code Mean?

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.

P1684 Code - Battery Power To Module Disconnected

Need more Information on the 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

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