What Does BMW 4E87 Code Mean and How to Fix It?

The BMW 4E87 code signifies an issue with the EGS solenoid valve 4, specifically related to the shift lock mechanism. This error often results in the inability to shift gears normally, requiring manual intervention to disengage the shift lock. Resolving this code involves diagnosing wiring issues, solenoid functionality, and potentially the Car Access System (CAS). AutoExplain.com provides expert remote support to tackle these challenges efficiently, reducing downtime.

1. Understanding the BMW 4E87 Code

What is the BMW 4E87 code? The BMW 4E87 code indicates a fault with the EGS (Electronic Gear Selector) solenoid valve 4, which controls the shift lock mechanism. This means the car’s computer has detected a problem in the electrical circuit or the solenoid itself, preventing the gear shifter from moving freely. The code is often accompanied by other related codes, such as 4E86 and A0B6, which can provide further insight into the root cause.

1.1 Symptoms Associated with the 4E87 Code

What symptoms should I look for with the 4E87 code?

• Shift Lock Malfunction: The most common symptom is the inability to move the gear shifter out of the park position without manually overriding the shift lock.
• iDrive Error Messages: The iDrive system might display messages indicating the car doesn’t recognize the current gear.
• No Voltage at Shift Lock Solenoid: Testing the connector at the base of the shifter might reveal a lack of voltage when the ignition is on and the brake pedal is pressed.
• Brake Lights Functionality: Despite the shift lock issue, the brake lights typically continue to function normally.
• Related Codes: You may also see codes like 4E86 (EGS solenoid valve 3) and A0B6 (CAS: Selector-level interlock).

1.2 Common Causes of the 4E87 Code

What are the common causes of the 4E87 code in BMWs? Several factors can trigger the 4E87 code, all relating to the electrical circuit or the shift lock solenoid itself. These include:

• Faulty Shift Lock Solenoid: The solenoid valve itself might be defective, preventing it from activating and releasing the shift lock.
• Wiring Issues: Damaged, corroded, or shorted wires in the circuit connecting the EGS to the shift lock solenoid can disrupt the electrical signal.
• Blown Fuses: A blown fuse in the EGS or related circuits can cut off power to the shift lock solenoid.
• Faulty EGS Module: Although less common, a malfunctioning EGS module can send incorrect signals or fail to activate the solenoid.
• CAS Module Issues: Problems with the Car Access System (CAS) module, which controls various security and access functions, can sometimes interfere with the shift lock mechanism.

Alt text: BMW EGS module responsible for controlling the shift lock mechanism.

2. Diagnosing the BMW 4E87 Code

How do I diagnose the BMW 4E87 code? Diagnosing the 4E87 code requires a systematic approach, starting with basic checks and progressing to more advanced troubleshooting. Start by verifying the symptoms, then move on to checking fuses, wiring, and the solenoid itself. If necessary, use a diagnostic scanner to read fault codes and monitor sensor data.

2.1 Step-by-Step Diagnostic Procedure

What steps should I follow to diagnose the 4E87 code?

1. Verify the Symptoms: Confirm that the shift lock is indeed malfunctioning and that the iDrive displays relevant error messages.
2. Check Fuses: Inspect all fuses related to the EGS and transmission control systems. Replace any blown fuses.
3. Inspect Wiring and Connectors: Examine the wiring harness and connectors leading to the shift lock solenoid for any signs of damage, corrosion, or loose connections.
4. Test Shift Lock Solenoid: Use a multimeter to measure the resistance of the shift lock solenoid. Compare the reading to the manufacturer’s specification (usually around 19-21 ohms). An open or shorted solenoid indicates a fault.
5. Check for Voltage at the Solenoid Connector: With the ignition on and the brake pedal pressed, use a multimeter to check for voltage at the shift lock solenoid connector. A lack of voltage suggests a wiring issue or a faulty EGS module.
6. Scan for Fault Codes: Use a BMW-specific diagnostic scanner to read all fault codes stored in the EGS, CAS, and other related modules. This can provide additional clues about the root cause of the problem.
7. Monitor Live Data: Use the diagnostic scanner to monitor live data from the EGS, including solenoid activation signals and gear selector position. This can help identify intermittent faults or signal abnormalities.

2.2 Tools Required for Diagnosis

What tools are needed to diagnose the 4E87 code? To effectively diagnose the 4E87 code, you’ll need the following tools:

• BMW-Specific Diagnostic Scanner: A scanner capable of reading BMW fault codes and monitoring live data.
• Multimeter: For testing voltage, resistance, and continuity in electrical circuits.
• Wiring Diagram: A wiring diagram for the EGS and shift lock solenoid circuit to trace wires and identify connection points.
• Basic Hand Tools: Screwdrivers, pliers, wire strippers, and other basic tools for accessing and inspecting components.

2.3 Using a BMW Diagnostic Scanner

How can a BMW diagnostic scanner help with the 4E87 code? A BMW-specific diagnostic scanner is invaluable for diagnosing the 4E87 code because it allows you to:

• Read Fault Codes: Retrieve detailed fault codes from the EGS, CAS, and other modules, providing specific information about the nature of the problem.
• Monitor Live Data: View real-time data from sensors and actuators, such as the gear selector position, solenoid activation signals, and voltage levels.
• Perform Actuator Tests: Activate the shift lock solenoid using the scanner to test its functionality and verify the wiring.
• Clear Fault Codes: Erase fault codes after repairs are completed to ensure the system is functioning correctly.

Alt text: BMW diagnostic scanner displaying live data for troubleshooting.

3. Repairing the BMW 4E87 Code

How do I fix the BMW 4E87 code? Repairing the 4E87 code depends on the underlying cause. It might involve replacing a faulty shift lock solenoid, repairing damaged wiring, or addressing issues with the EGS or CAS module. Always follow the manufacturer’s recommended procedures and use high-quality replacement parts.

3.1 Replacing a Faulty Shift Lock Solenoid

How do I replace a faulty shift lock solenoid? If the shift lock solenoid is found to be faulty, replacing it is necessary. Here’s the general procedure:

1. Disconnect the Battery: Disconnect the negative terminal of the battery to prevent electrical shock.
2. Remove the Center Console: Remove the center console trim to access the shift lock solenoid.
3. Disconnect the Electrical Connector: Disconnect the electrical connector from the shift lock solenoid.
4. Remove the Solenoid: Remove the screws or clips holding the solenoid in place and carefully remove it.
5. Install the New Solenoid: Install the new shift lock solenoid, ensuring it is properly seated and secured.
6. Reconnect the Electrical Connector: Reconnect the electrical connector to the new solenoid.
7. Reinstall the Center Console: Reinstall the center console trim.
8. Reconnect the Battery: Reconnect the negative terminal of the battery.
9. Test the System: Test the shift lock mechanism to ensure it is functioning correctly.
10. Clear Fault Codes: Use a diagnostic scanner to clear any fault codes stored in the EGS module.

3.2 Repairing Wiring Issues

How do I repair wiring issues causing the 4E87 code? If damaged or corroded wiring is causing the 4E87 code, repairing the wiring is essential. This might involve:

1. Identifying the Damaged Wires: Use a wiring diagram and a multimeter to identify the damaged wires in the shift lock solenoid circuit.
2. Repairing or Replacing Wires: Repair damaged wires by splicing in new sections of wire using solder and heat shrink tubing. Replace severely damaged wires entirely.
3. Cleaning Connectors: Clean corroded connectors with electrical contact cleaner and ensure they are properly seated.
4. Protecting Wires: Protect repaired wires with electrical tape or wire loom to prevent future damage.
5. Testing the Circuit: Use a multimeter to test the repaired circuit for continuity and proper voltage.

3.3 Addressing EGS or CAS Module Issues

How do I address issues with the EGS or CAS module? If the EGS or CAS module is suspected of causing the 4E87 code, further diagnosis and repair might be necessary. This could involve:

• Software Update: Updating the software in the EGS or CAS module to the latest version.
• Module Programming: Reprogramming the EGS or CAS module with the correct software and parameters.
• Module Replacement: Replacing the EGS or CAS module entirely if it is found to be irreparable.

Note: Module programming and replacement often require specialized tools and expertise. Consider seeking assistance from a qualified BMW technician or a service like AutoExplain.com for remote programming support.

Alt text: BMW wiring diagram illustrating the shift lock solenoid circuit.

4. Preventing the 4E87 Code

How can I prevent the 4E87 code from recurring? While some causes of the 4E87 code are unavoidable, there are steps you can take to minimize the risk of recurrence:

• Regular Maintenance: Perform regular maintenance on your BMW, including inspecting and cleaning electrical connections.
• Protect Wiring: Protect wiring harnesses from damage by using wire loom and securing them properly.
• Address Issues Promptly: Address any electrical issues or warning signs promptly to prevent them from escalating into more serious problems.
• Avoid Water Damage: Avoid exposing your BMW’s electrical components to water or moisture, as this can cause corrosion and damage.

5. Advanced Troubleshooting Techniques

What are some advanced troubleshooting techniques for the 4E87 code? For particularly challenging cases, consider these advanced troubleshooting techniques:

• Voltage Drop Testing: Perform voltage drop testing on the shift lock solenoid circuit to identify areas of high resistance and potential wiring issues.
• Oscilloscope Analysis: Use an oscilloscope to analyze the signal waveforms from the EGS module to the shift lock solenoid. This can reveal subtle signal abnormalities that might not be detectable with a multimeter.
• Component Isolation: Isolate individual components in the circuit to determine if they are causing the problem. For example, disconnect the shift lock solenoid and test the EGS module’s output signal to see if it is functioning correctly.

6. The Role of AutoExplain.com in Solving BMW Electrical Issues

How can AutoExplain.com help with BMW electrical issues like the 4E87 code? AutoExplain.com specializes in providing remote diagnostic, programming, and repair support for BMW vehicles, including complex electrical issues like the 4E87 code. Our experienced technicians can:

• Provide Expert Guidance: Offer step-by-step guidance on diagnosing and repairing the 4E87 code, based on their extensive knowledge of BMW systems.
• Perform Remote Diagnostics: Use advanced diagnostic tools to remotely access your BMW’s computer systems and identify the root cause of the problem.
• Offer Programming and Coding Services: Perform remote programming and coding of EGS, CAS, and other modules to address software-related issues.
• Provide Wiring Diagrams and Technical Information: Supply detailed wiring diagrams and technical information to assist with wiring repairs.

6.1 Benefits of Using AutoExplain.com

What are the benefits of using AutoExplain.com for BMW repairs?

• Expertise: Access to experienced BMW technicians with specialized knowledge of electrical systems.
• Convenience: Remote support eliminates the need to transport your vehicle to a repair shop.
• Cost Savings: Avoid expensive diagnostic fees and repair costs associated with traditional repair shops.
• Speed: Receive prompt assistance and get your BMW back on the road quickly.

Alt text: AutoExplain remote support technician assisting with BMW diagnostics.

6.2 Contacting AutoExplain.com for Support

How can I contact AutoExplain.com for help with the 4E87 code? If you’re struggling with the 4E87 code or any other BMW electrical issue, don’t hesitate to contact AutoExplain.com for expert assistance. You can reach us via:

• WhatsApp: (+84)967469410
• Email: [email protected]
• Website: AutoExplain.com
• Office Address: 1500 N Grant ST Sten Denver, CO 80203

Our team is ready to provide the support you need to resolve your BMW’s electrical problems quickly and effectively.

7. Understanding the Electronic Gear Selector (EGS)

What is the Electronic Gear Selector (EGS) and its role in the 4E87 code? The Electronic Gear Selector (EGS) is a control module that manages the automatic transmission functions in BMW vehicles. It receives input from various sensors, including the gear selector lever, and controls the transmission’s solenoids and actuators to shift gears. In the context of the 4E87 code, the EGS is responsible for activating the shift lock solenoid, which prevents the gear selector from being moved out of the park position unless the brake pedal is pressed.

7.1 How the EGS Works

How does the EGS work in conjunction with the shift lock solenoid? The EGS monitors the brake pedal position sensor. When the brake pedal is pressed, the EGS sends a signal to the shift lock solenoid, energizing it and releasing the mechanical lock. This allows the driver to move the gear selector out of the park position. If the EGS detects a fault in the shift lock solenoid circuit or if the brake pedal signal is missing, it will prevent the solenoid from activating, resulting in the 4E87 code and the inability to shift gears normally.

7.2 Common EGS Faults

What are some common faults associated with the EGS module?

• Software Corruption: Corrupted software in the EGS module can lead to various transmission problems, including shift lock malfunctions.
• Internal Component Failure: Internal component failures in the EGS module can disrupt its ability to control the transmission’s solenoids and actuators.
• Communication Issues: Communication problems between the EGS module and other control modules in the vehicle can also cause transmission issues.

8. Car Access System (CAS) and its Impact

How does the Car Access System (CAS) relate to the 4E87 code? The Car Access System (CAS) is a control module responsible for vehicle security and access functions, including immobilizer functions, key recognition, and starter activation. While the CAS module is not directly involved in controlling the shift lock solenoid, it can indirectly affect its operation. For example, if the CAS module is not properly communicating with the EGS module, it can prevent the EGS from receiving the necessary signals to activate the shift lock solenoid.

8.1 CAS Module Functions

What are the key functions of the CAS module in BMW vehicles?

• Immobilizer: Prevents the engine from starting unless a valid key is present.
• Key Recognition: Recognizes and authenticates the vehicle’s key.
• Starter Activation: Activates the starter motor when the key is recognized and the engine start button is pressed.
• Communication with Other Modules: Communicates with other control modules in the vehicle, such as the EGS, DME (Digital Motor Electronics), and instrument cluster.

8.2 CAS-Related Issues

What types of issues with the CAS module can cause the 4E87 code?

• Communication Errors: Communication errors between the CAS module and the EGS module can disrupt the shift lock solenoid’s operation.
• Software Glitches: Software glitches in the CAS module can interfere with its ability to properly communicate with other modules.
• Module Failure: In rare cases, the CAS module itself can fail, leading to various issues, including shift lock malfunctions.

9. Shift Lock Solenoid: Operation and Testing

How does the shift lock solenoid work, and how can I test it? The shift lock solenoid is an electromechanical device that prevents the gear selector from being moved out of the park position unless the brake pedal is pressed. When the brake pedal is pressed, the EGS module sends a signal to the solenoid, energizing it and releasing the mechanical lock.

9.1 Solenoid Operation

How does the solenoid actually release the shift lock? The shift lock solenoid consists of a coil of wire wrapped around a movable plunger. When the coil is energized, it creates a magnetic field that pulls the plunger, releasing the mechanical lock on the gear selector. When the coil is de-energized, a spring pushes the plunger back into its original position, locking the gear selector.

9.2 Testing the Solenoid

How can I test the shift lock solenoid to determine if it’s faulty?

1. Resistance Test: Use a multimeter to measure the resistance of the solenoid coil. A typical solenoid should have a resistance of around 19-21 ohms. An open circuit (infinite resistance) or a short circuit (zero resistance) indicates a faulty solenoid.
2. Voltage Test: With the ignition on and the brake pedal pressed, use a multimeter to check for voltage at the solenoid connector. A lack of voltage suggests a wiring issue or a faulty EGS module.
3. Activation Test: Use a diagnostic scanner to activate the solenoid and listen for a clicking sound. If the solenoid does not click, it is likely faulty.

Alt text: Shift lock solenoid with electrical connector and mechanical plunger.

10. Frequently Asked Questions (FAQ) about the BMW 4E87 Code

Here are some frequently asked questions about the BMW 4E87 code:

1. Can I drive my BMW with the 4E87 code?

Driving with the 4E87 code is possible if you manually override the shift lock, but it’s not recommended. The underlying issue could worsen, and it might be unsafe.

2. How much does it cost to fix the 4E87 code?

The cost to fix the 4E87 code varies depending on the cause. A simple wiring repair might cost $100-$200, while replacing the EGS module could cost $1000 or more.

3. Is the 4E87 code a serious problem?

Yes, the 4E87 code can be a serious problem, as it affects the vehicle’s ability to shift gears normally.

4. Can I fix the 4E87 code myself?

If you have experience with automotive electrical systems, you might be able to fix the 4E87 code yourself. However, it requires specialized tools and knowledge. AutoExplain.com can offer remote support.

5. What other codes are often associated with the 4E87 code?

Codes like 4E86 (EGS solenoid valve 3) and A0B6 (CAS: Selector-level interlock) are often associated with the 4E87 code.

6. Can a low battery cause the 4E87 code?

In some cases, a low battery can cause electrical issues that trigger the 4E87 code.

7. How do I clear the 4E87 code after repair?

Use a BMW-specific diagnostic scanner to clear the 4E87 code after completing the necessary repairs.

8. What is the location of the shift lock solenoid in a BMW?

The shift lock solenoid is typically located at the base of the gear shifter, inside the center console.

9. Can a faulty brake light switch cause the 4E87 code?

Yes, a faulty brake light switch can cause the 4E87 code, as the EGS module relies on the brake pedal signal to activate the shift lock solenoid.

10. Where can I find a wiring diagram for the shift lock solenoid circuit?

Wiring diagrams for the shift lock solenoid circuit can be found in the BMW repair manual or online technical databases. AutoExplain.com can also provide wiring diagrams to our customers.

Experiencing the frustration of a BMW 4E87 code? Don’t let shift lock issues keep you off the road. Contact AutoExplain.com today for expert remote diagnostic and repair assistance. Reach out via WhatsApp at (+84)967469410 or email us at [email protected], and let our experienced technicians get you back in gear. Visit AutoExplain.com for more information.