how to fix P0700 transmission code in BMW 3 Series E90/E91 (2005-2012)

BMW 3 Series E90/E91 (2005-2012)

Error Codes

2-4 hours

Time

medium

Difficulty

medium

Severity

Error Code: P0700

3 min read

501 words

Problem Statement

The P0700 code indicates a general transmission fault in the BMW 3 Series E90/E91 (2005-2012). This code is often triggered by other related trouble codes and points to issues wit

Error Code

P0700

Estimated Time

2-4 hours

⚠️ Safety Warnings

Important safety information - read before proceeding

•Disconnect the battery before working on electrical systems.
•Allow the transmission to cool before servicing to prevent burns.

Symptoms

•Check engine light illuminated
•Rough shifting or delayed engagement
•Transmission slipping or loss of power during acceleration
•Unusual noises from the transmission
•Decreased fuel economy

Diagnostic Steps

1
Scan for Error Codes**: Use an OBD-II scanner to retrieve any additional transmission-related codes (e.g., P0715, P0730).
2
Inspect Transmission Fluid**: Check the transmission fluid level and condition; low or dirty fluid can cause transmission issues.
3
Visual Inspection**: Look for any visible leaks around the transmission and inspect wiring and connectors for damage.
4
Check Transmission Control Module (TCM)**: Verify the TCM is functioning properly; check for software updates or faults.
5
Test Input/Output Sensors**: Use a multimeter to test the operation of the input and output speed sensors.

Solution

💡 Expert Tip

For complex repairs like this, consider taking photos at each step. This helps if you need to reverse a step or consult with a mechanic. Also, keep all removed parts organized - you may need to reference them during reassembly.

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
•Multimeter
•Transmission fluid pump (if changing fluid)

Parts Required

•Automatic Transmission Fluid (specific to BMW)
•Input/Output speed sensors (if faulty)

Related Faults

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Diagnostic Steps

1
Scan for Error Codes**: Use an OBD-II scanner to retrieve any additional transmission-related codes (e.g., P0715, P0730).
2
Inspect Transmission Fluid**: Check the transmission fluid level and condition; low or dirty fluid can cause transmission issues.
3
Visual Inspection**: Look for any visible leaks around the transmission and inspect wiring and connectors for damage.
4
Check Transmission Control Module (TCM)**: Verify the TCM is functioning properly; check for software updates or faults.
5
Test Input/Output Sensors**: Use a multimeter to test the operation of the input and output speed sensors.

Solution

1. Preparation

Gather necessary tools and parts.
Disconnect the battery to prevent electrical shorts.
Ensure the vehicle is on a level surface and secure it with wheel chocks.

2. Address Fluid Issues

Check Fluid Level and Condition:
- Remove the transmission dipstick, wipe clean, reinsert, and check fluid level.
- If low, add the recommended ATF (Automatic Transmission Fluid) as specified in the owner’s manual.
- If the fluid is dark or smells burnt, consider a transmission fluid change.

3. Replace Faulty Sensors

Input/Output Speed Sensors:
- Locate the sensors on the transmission.
- Disconnect the electrical connector.
- Remove the retaining bolts and take out the sensor.
- Install the new sensor and reconnect the electrical connector.
- Torque the bolts to manufacturer specifications.

4. Reprogram TCM (if necessary)

If the TCM requires reprogramming due to software issues:
- Use a BMW-specific diagnostic tool (e.g., ISTA or INPA) to perform the reprogramming.
- Follow the on-screen instructions to complete the process.

5. Reconnect Battery and Test Drive

Reconnect the battery and clear any error codes using the OBD-II scanner.
Conduct a test drive to ensure the transmission operates smoothly.