U0237 - Lost Communication with Body Control Module (BCM) in Popular Vehicles

Quick Answer

U0237 means: U0237 signifies a communication failure between the Engine Control Module and Body Control Module.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U0237? Immediate attention is needed to prevent electrical malfunctions.

Common Questions

What does U0237 mean and how does it affect my car?

U0237 indicates a lost communication between the ECM and the BCM, affecting functions like lights and locks. This can lead to safety issues if not resolved.

What are the most common causes of U0237 and how much does it cost to fix?

Common causes include faulty wiring (40%) and BCM malfunction. Repair costs can range from $100 for wiring to $800 for BCM replacement.

Can I drive my car with U0237 or should I stop immediately?

It's advisable to stop driving if you experience significant electrical issues, as they can compromise safety.

How can I diagnose U0237 myself using GeekOBD APP?

Use the GeekOBD APP to scan for codes, check freeze frame data, and monitor live data for potential causes.

What vehicles are most commonly affected by U0237?

Commonly affected vehicles include the 2014-2019 Chevrolet Silverado and the 2015-2018 Ford F-150.

How can I prevent U0237 from happening again?

Regularly inspect electrical connections and ensure a good battery condition to prevent future occurrences.

What is U0237?

The diagnostic trouble code (DTC) U0237 indicates that there is a lost communication issue between the vehicle's Engine Control Module (ECM) and the Body Control Module (BCM). This problem is particularly common in vehicles like the 2014-2019 Chevrolet Silverado and the 2015-2018 Ford F-150. The BCM is responsible for various functions, including controlling lights, power windows, and other electrical components. When the ECM cannot communicate with the BCM, it may lead to several electronic malfunctions, such as the failure of these systems to operate correctly. Drivers may experience symptoms like the dashboard lights flickering, power windows not functioning, or issues with the vehicle's door locks. Ignoring this code can lead to further electrical problems, affecting overall vehicle performance and safety. To address U0237 effectively, it's crucial to diagnose the root cause, which often involves checking the wiring, connectors, and the modules themselves. If you experience this code, it's advisable to seek professional help as it may require specialized tools and knowledge to fix the underlying issues.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0237 is present:

  • Check engine light stays on constantly, indicating ongoing issues.
  • Power windows may fail to operate or respond erratically, affecting driver convenience.
  • Dashboard lights may flicker or not illuminate, which can cause confusion while driving.
  • Door locks might not function properly, leading to security concerns.
  • Electrical accessories, such as headlights or wipers, may not work as intended, impacting safety.

Possible Causes

Most common causes of U0237 (ordered by frequency):

  1. Faulty wiring or loose connections account for about 40% of U0237 occurrences. This could include corroded connectors or damaged wires in the harness.
  2. A malfunctioning Body Control Module (BCM) is the second most common cause, often requiring replacement or reprogramming.
  3. Poor battery condition, which can disrupt the communication between modules, is another cause. Regular checks and maintenance can prevent this.
  4. Less common but serious causes include software issues within the ECM or BCM, requiring a firmware update.
  5. In rare cases, environmental factors like water intrusion into the BCM can lead to communication failures.

U0237 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing or replacing damaged wiring and connectors.

  • Total: $100 - $300
  • Success rate: 85%
BCM Replacement

Replacing a faulty Body Control Module.

  • Total: $400 - $800
  • Success rate: 90%
Money-Saving Tips for U0237
  • Start with the most common and least expensive repairs first
  • Use GeekOBD APP to confirm diagnosis before replacing expensive parts
  • Consider preventive maintenance to avoid future occurrences
  • Compare prices for OEM vs aftermarket parts based on your needs
  • Address the issue promptly to prevent more expensive secondary damage

Diagnostic Steps

Professional U0237 Diagnosis Process

Follow these systematic steps to accurately diagnose U0237. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Retrieve all codes and freeze frame data to understand the fault context (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

Important Notes

  • Always verify the repair with GeekOBD APP after completing diagnostic steps
  • Clear codes and test drive to ensure the problem is resolved
  • Address underlying causes to prevent code recurrence

Real Repair Case Studies

Case Study 1: 2016 Chevrolet Silverado - U0237 Diagnosis and Repair

Vehicle: 2016 Chevrolet Silverado, mileage 45,000

Problem: Customer reported intermittent power window failures and dashboard light issues.

Diagnosis: Conducted a visual inspection and found corroded connectors in the wiring harness.

Solution: Repaired the damaged connectors and cleaned the wiring, restoring communication.

Cost: $200 (parts and labor)

Result: All electrical functions returned to normal with no further issues reported.

Case Study 2: 2017 Ford F-150 - BCM Replacement Due to U0237

Vehicle: 2017 Ford F-150, mileage 60,000

Problem: Customer experienced non-functioning door locks and erratic dashboard lights.

Diagnosis: Performed a full diagnostic scan and identified a faulty BCM.

Solution: Replaced the Body Control Module and reprogrammed it to the vehicle.

Cost: $600 (including BCM and programming)

Result: The vehicle's electrical systems functioned perfectly post-repair.

Diagnose U0237

Use GeekOBD APP for professional diagnosis!

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  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: U0237
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes