U0936 - Understanding DTC U0936: A Comprehensive Guide for 2014-2020 Chevrolet Silverado Owners

Quick Answer

U0936 means: U0936 indicates a lost communication between the body control module and other vehicle systems.

Fix: Check and replace faulty components Cost: $300 - $800 Time: 90-180 minutes

Can I drive with U0936? Address this code promptly to prevent further electronic malfunctions.

Common Questions

What does U0936 mean and how does it affect my car?

The U0936 code indicates a loss of communication between the body control module and other vehicle systems. This can impact various electronic functionalities, leading to issues like malfunctioning lights or erratic accessory performance. If left unaddressed, it can cause more extensive electronic failures.

What are the most common causes of U0936 and how much does it cost to fix?

The primary causes of the U0936 code include a faulty body control module, wiring issues, and power supply problems. Repair costs can range widely, typically from $100 for simple wiring repairs to $800 for BCM replacements, depending on the issue's complexity.

Can I drive my car with U0936 or should I stop immediately?

While you may still be able to drive your vehicle, it's advisable to address the U0936 code promptly. Ignoring it could lead to failures in critical systems, posing safety risks.

How can I diagnose U0936 myself using GeekOBD APP?

You can use the GeekOBD APP to scan your vehicle for diagnostic trouble codes. It allows you to view live data and freeze frame information that can help you pinpoint the source of the U0936 code, making it easier to understand what repairs might be needed.

What vehicles are most commonly affected by U0936?

The U0936 code is commonly found in vehicles like the 2014-2020 Chevrolet Silverado and GMC Sierra models. These vehicles may experience electronic issues related to the body control module, which could lead to this code being triggered.

How can I prevent U0936 from happening again?

Regular maintenance, including checks on electrical connections and battery health, can help prevent the U0936 code from appearing again. Additionally, ensuring that software updates are performed on the BCM can also mitigate future communication issues.

What is U0936?

The diagnostic trouble code (DTC) U0936 indicates a communication issue within the vehicle's network, specifically associated with the control modules. This code often points to a lost communication between the body control module (BCM) and other modules like the powertrain control module (PCM) or the anti-lock brake system (ABS) module. When the U0936 code triggers, it can lead to various problems including malfunctioning lights, erratic electronic features, or even engine performance issues. For instance, if you own a 2016 Chevrolet Silverado, you might experience problems with your dashboard lights flickering or your radio cutting in and out. This is because the BCM is responsible for managing various electronic functions, and if it can't communicate effectively with other systems, these functions can become compromised. Ignoring the code may lead to worsening symptoms and potential safety hazards, as crucial systems might fail to operate properly. Therefore, understanding the implications of U0936 is vital for maintaining your vehicle's functionality and safety. Regular diagnostics using OBD2 tools, like the GeekOBD APP, can help identify and address such issues early on.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0936 is present:

  • Check engine light remains illuminated, indicating a persistent issue requiring immediate attention.
  • Dashboard lights may flicker or malfunction, leading to confusion about the vehicle's status.
  • Power windows and locks may work intermittently, causing frustration when trying to operate them.
  • Erratic behavior of electronic accessories, such as the radio turning off unexpectedly.
  • Engine performance may suffer, with symptoms like hesitation during acceleration or difficulty starting.

Possible Causes

Most common causes of U0936 (ordered by frequency):

  1. Faulty body control module (BCM) is the most common cause (60% likelihood). If the BCM is damaged or has software issues, it can disrupt communication.
  2. Wiring issues account for 25% of cases. Damaged or corroded connectors and wiring can prevent the BCM from communicating effectively with other modules.
  3. Power supply problems (10% likelihood). A weak battery or poor ground connections can lead to sporadic communication failures.
  4. Less common causes include software glitches in the BCM, which may require reprogramming or updates.
  5. Rare causes include physical damage to the control module due to accidents or water ingress.

U0936 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing the body control module if it's found to be faulty.

  • Total: $300 - $800
  • Success rate: 85%
Wiring Repair

Repairing damaged wiring or connectors that may be causing the communication loss.

  • Total: $100 - $300
  • Success rate: 90%
Money-Saving Tips for U0936
  • 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 U0936 Diagnosis Process

Follow these systematic steps to accurately diagnose U0936. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Initial visual inspection - Examine the wiring and connectors for any signs of damage, corrosion, or loose connections (5-10 minutes)

Step 1: Initial visual inspection - Examine the wiring and connectors for any signs of damage, corrosion, or loose connections (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 - Use the app to retrieve all trouble codes and freeze frame data to provide context for the U0936 code (10-15 minutes)

Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all trouble codes and freeze frame data to provide context for the U0936 code (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 - Test the BCM and related wiring using a multimeter to check for continuity and proper voltage levels (20-30 minutes)

Step 3: Component testing - Test the BCM and related wiring using a multimeter to check for continuity and proper voltage levels (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 - After addressing any issues, verify the proper operation of the BCM and clear the codes (10-15 minutes)

Step 4: System function test - After addressing any issues, verify the proper operation of the BCM and clear the 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 varied conditions to ensure all systems operate normally and the code does not return (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under varied conditions to ensure all systems operate normally and the code does not return (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 - Flickering Dashboard Lights

Vehicle: 2016 Chevrolet Silverado, 45,000 miles

Problem: Customer reported dashboard lights flickering and occasional radio shut off.

Diagnosis: After scanning with GeekOBD APP, the U0936 code was identified. A visual inspection revealed corroded connectors at the BCM.

Solution: Replaced the corroded connectors and re-sealed the wiring harness. Cleared the codes and verified functionality.

Cost: $150 for parts and labor

Result: Dashboard lights functioned normally post-repair, and no further issues were reported.

Case Study 2: 2018 GMC Sierra - Intermittent Power Window Issues

Vehicle: 2018 GMC Sierra, 30,000 miles

Problem: Customer experienced intermittent power window failures and erratic behavior of vehicle electronics.

Diagnosis: The U0936 code was retrieved via GeekOBD APP. Testing indicated a faulty BCM.

Solution: Replaced the BCM and reprogrammed it to ensure compatibility with other systems.

Cost: $600 for BCM replacement and programming

Result: All electronic features operated correctly after the repair, with no return of the U0936 code.

Diagnose U0936

Use GeekOBD APP for professional diagnosis!

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

Code: U0936
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes