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Home/Cars/BMW/3 Series/F30/F31 (2012-2019)/how to diagnose P0700 transmission code on BMW 3 Series F30/F31 (2012-2019)

how to diagnose P0700 transmission code on BMW 3 Series F30/F31 (2012-2019)

BMW 3 Series F30/F31 (2012-2019)

Severity: mediumDifficulty: mediumError Code: P07002-4 hours
3 min read
550 words

Problem Statement

## Problem Statement The P0700 code indicates a malfunction within the transmission control system of a BMW 3 Series F30/F31 (2012-2019). This generic code signifies that there are issues with the tra

Error Code
P0700
Repair Time
2-4 hours

Safety Warnings

  • ⚠Safety Warnings:**
  • ⚠Disconnect battery before working on electrical systems.
  • ⚠Allow the engine to cool before opening the transmission system.

Symptoms

  • •Check engine light illuminated
  • •Rough or erratic shifting
  • •Delayed engagement when shifting from park to drive or reverse
  • •Transmission overheating
  • •Decreased fuel efficiency

Diagnostic Steps

  1. 1Scan for Error Codes**: Use an OBD-II scanner to retrieve any additional diagnostic trouble codes (DTCs) stored in the transmission control module (TCM).
  2. 2Visual Inspection**: Inspect the transmission fluid level and condition; check for leaks around the transmission and associated components.
  3. 3Check for Electrical Issues**: Inspect the wiring and connectors related to the transmission for corrosion, damage, or loose connections.
  4. 4Test Transmission Fluid Temperature Sensor**: Verify the operation of the transmission fluid temperature sensor using a multimeter.
  5. 5Perform a Transmission Adaptation Reset**: Execute a reset of the transmission adaptation settings using a diagnostic tool to see if the issue resolves after reprogramming.
  6. 6Inspect the Transmission Control Module**: Check for any signs of failure or damage to the TCM, and ensure it's receiving proper voltage and ground.

Solution

Solution

1. Preparation

  • Gather tools and parts needed for repair.
  • Disconnect the battery to ensure safety while working on electrical systems.

2. Replace Faulty Components

  • Transmission Fluid:
    • Drain the old transmission fluid using a fluid extractor.
    • Replace it with the manufacturer-recommended fluid (e.g., BMW ATF).
  • Transmission Filter:
    • Remove the transmission pan using a socket set and clean the mating surfaces.
    • Replace the transmission filter as per manufacturer specifications.
  • Wiring/Connectors:
    • Repair or replace any damaged wiring or connectors found during the visual inspection.

3. Reassemble and Refill

  • Reinstall the transmission pan using a torque wrench, tightening bolts to the manufacturer’s specified torque settings.
  • Refill the transmission with new fluid through the dipstick tube or designated fill port, ensuring the correct level is reached.

4. Reconnect Battery

  • Reconnect the battery terminals ensuring they are secure.

5. Reset and Test

  • Use an OBD-II scanner to clear the P0700 code.
  • Take the vehicle for a test drive to ensure the transmission operates smoothly and the check engine light remains off.

Verification

After completing the repair, verify that the issue has been resolved:

  • Test the affected component to ensure it functions correctly
  • Check for any error codes or warning lights
  • Monitor the vehicle for a few days to ensure the issue does not recur

Prevention Tips

To prevent this issue from occurring again:

  • •Follow the manufacturer's recommended maintenance schedule
  • •Address warning signs early before they develop into major issues
  • •Use quality parts and fluids recommended for your vehicle
  • •Keep detailed records of all repairs and maintenance

Tools & Equipment Required

  • OBD-II scanner
  • Socket set
  • Torque wrench
  • Fluid extractor
  • Multimeter

Parts Required

  • Transmission fluid (BMW ATF)
  • Transmission filter
  • Gasket for transmission pan (if applicable)

Additional Information

Error CodeP0700
Repair Time

2-4 hours

Difficulty

medium

Severity

medium

Tools

5 items

Parts

3 items

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