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Engine-Codes – BMW – P1624 BMW

P1624 BMW Code - MIL Request Signal Active

Quick Answer

The P1624 code for BMW vehicles indicates that the Malfunction Indicator Lamp (MIL) request signal is active. Common causes include Faulty oxygen sensor, Issues with the catalytic converter, Wiring or electrical problems. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P1624 BMW indicates MIL Request Signal Active.
Common causes
Common causes include Faulty oxygen sensor, Issues with the catalytic converter, Wiring or electrical problems.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P1624 BMW Description

The P1624 code for BMW vehicles indicates that the Malfunction Indicator Lamp (MIL) request signal is active. This means that the engine control module (ECM) has detected a fault or issue that requires attention. The MIL is the warning light on the dashboard that illuminates when there is a problem with the engine or emissions system. When the MIL request signal is active, it typically means that there is a fault code stored in the ECM that needs to be diagnosed and repaired. Ignoring this code could lead to further engine or emissions system issues and may result in decreased performance and fuel efficiency.

OBDII Code P1624 BMW - MIL Request Signal Active
P1624 BMW Code - MIL Request Signal Active

Common Causes of P1624 BMW

  1. Faulty oxygen sensor
  2. Issues with the catalytic converter
  3. Wiring or electrical problems
  4. Defective ECM
  5. Fuel system issues

Symptoms of P1624 BMW

  1. Illumination of the Check Engine Light
  2. Engine running rough or misfiring
  3. Reduced engine power
  4. Poor fuel economy
  5. Difficulty starting the vehicle

How to Fix P1624 BMW

  1. Use an OBD-II scanner to read and document the fault code.
  2. Inspect the oxygen sensor and catalytic converter for any signs of damage or malfunction.
  3. Check the wiring and connections related to the ECM and emissions system.
  4. Test the fuel system components for proper function.
  5. Clear the fault code from the ECM and perform a test drive to ensure the issue has been resolved.

Cost to Fix P1624 BMW

The cost of repairing a P1624 code on a BMW can vary depending on the specific cause of the issue. In general, the cost for parts and labor to diagnose and repair this code can range from $200 to $500. Keep in mind that labor rates at auto repair shops can vary, so it's best to get a few quotes from different shops in your area to determine the most accurate estimate for your vehicle.

What does this mean?

Tech Notes for P1624 BMW

Transmission Control Module (TCM) request Engine Control Module (ECM) turn Malfunction Indicator Lamp (MIL) ON

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1624 BMW Code

1. What does the BMW OBDII code P1624 mean?

P1624 in a BMW indicates "MIL Request Signal Active," meaning the transmission control module (TCM) has requested the engine control module (ECM) to turn on the Malfunction Indicator Light (MIL).

2. What are the common symptoms of code P1624 in a BMW?

Symptoms may include the check engine light being illuminated, poor transmission performance, erratic shifting, or the vehicle entering limp mode.

3. What causes the P1624 code to appear in a BMW?

Common causes include transmission system faults, communication issues between the TCM and ECM, wiring problems, or a malfunctioning sensor.

4. Can a faulty transmission cause the P1624 code?

Yes, transmission-related issues such as solenoid failure or internal mechanical problems can trigger the P1624 code.

5. How is the P1624 code diagnosed in a BMW?

A mechanic will use a diagnostic scanner to retrieve codes from both the TCM and ECM, inspect wiring and connectors, and test communication signals between the modules.

6. Is it safe to drive a BMW with the P1624 code?

Driving with the P1624 code may be unsafe, as it often indicates transmission issues that could worsen and lead to reduced performance or drivetrain damage.

7. How do you fix the P1624 code on a BMW?

Repairs may include addressing transmission faults, repairing or replacing damaged wiring, updating the ECM/TCM software, or replacing faulty sensors.

8. Can clearing the code fix the P1624 issue?

Clearing the code might turn off the check engine light temporarily, but the underlying problem must be resolved to prevent the code from returning.

9. Does P1624 always indicate a transmission problem in a BMW?

Not always. While it often relates to transmission issues, it could also be caused by communication errors or software glitches between the TCM and ECM.

10. How much does it cost to repair the P1624 code on a BMW?

The repair cost varies widely, ranging from $100 for a simple wiring fix to over $1,000 for major transmission repairs or module replacements.

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