AutoCodes – BMW – P16B4 BMW

P16B4 BMW Code - Engine Control Module Self-Test Cruise Control Distance Monitoring Fault

Quick Answer

The Engine Control Module (ECM) monitors the Cruise Control Distance. Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection. 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: P16B4 BMW indicates Engine Control Module Self-Test Cruise Control Distance Monitoring Fault.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module (ECM) harness is open or shorted, Engine Control Module (ECM) circuit poor electrical connection.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,581

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P16B4 BMW Description

The Engine Control Module (ECM) monitors the Cruise Control Distance. The ECM sets the OBDII code when the Cruise Control Distance is not to factory specifications.

OBDII Code P16B4 BMW - Engine Control Module Self-Test Cruise Control Distance Monitoring Fault - AutoCodes.com — P16B4 BMW Code - Engine Control Module Self-Test Cruise Control Distance Monitoring Fault

What does this mean?

What are the Possible Causes of the DTC P16B4 BMW?

Faulty Engine Control Module (ECM)
Engine Control Module (ECM) harness is open or shorted
Engine Control Module (ECM) circuit poor electrical connection

How to Fix the DTC P16B4 BMW?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P16B4 BMW code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P16B4 BMW code?

Need more information on how to fix the P16B4 BMW code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P16B4 BMW code diagnosed by a professional: Find a repair shop in your area

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 P16B4 BMW Code

1. What does the P16B4 code mean on a BMW?

The P16B4 code indicates a fault in the Engine Control Module (ECM) related to the self-test for cruise control distance monitoring.

2. What are the symptoms of the P16B4 code in a BMW?

Symptoms may include the cruise control system not functioning, a check engine light, or erratic behavior of adaptive cruise control if equipped.

3. What causes the P16B4 code to appear?

Common causes include a malfunctioning ECM, faulty cruise control distance sensor, wiring issues, or software glitches.

4. Can I still drive my BMW with the P16B4 code?

Yes, the vehicle is usually drivable, but the cruise control system may not work, and itâ€™s recommended to address the issue promptly.

5. How is the P16B4 code diagnosed?

A mechanic will use an OBDII scanner to read the code, inspect the cruise control sensors, check ECM functionality, and examine related wiring.

6. How can I fix the P16B4 code on my BMW?

Repairs may involve replacing the cruise control distance sensor, repairing wiring, updating ECM software, or, in rare cases, replacing the ECM.

7. Is the P16B4 code common in BMW vehicles?

This code is relatively uncommon, but it may occur in models with advanced cruise control or adaptive driving systems.

8. How much does it cost to fix the P16B4 code on a BMW?

Repair costs vary but can range from $200 to $1,500 depending on whether a sensor, wiring, or the ECM needs replacement.

9. Can a software update resolve the P16B4 code on a BMW?

Yes, in some cases, a software update for the ECM can resolve the issue if itâ€™s caused by a programming bug.

10. Should I take my BMW to a dealer or an independent shop for the P16B4 code?

Taking your BMW to a shop with experience in BMW diagnostics or a dealership is recommended, as they have the tools and expertise to handle ECM and cruise control issues.