U0864 - Communication Error in Vehicle Network (Common in 2015-2019 Chevrolet Silverado and GMC Sierra)

Quick Answer

U0864 means: U0864 indicates a communication error between vehicle control modules.

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

Can I drive with U0864? Immediate attention is recommended to avoid further damage.

Common Questions

What does U0864 mean and how does it affect my car?

U0864 signals a communication error between electronic modules in your vehicle. This can lead to malfunctions such as failure of power windows, unstable engine performance, or even entering limp mode, which limits your vehicle's speed and power to prevent damage. It's crucial to address this code promptly to maintain vehicle performance and safety.

What are the most common causes of U0864 and how much does it cost to fix?

Common causes include damaged wiring (60% likelihood), malfunctioning control modules (25%), and poor battery connections (10%). Repair costs can range from $100 for wiring repairs to $800 for control module replacement, depending on the extent of the issue.

Can I drive my car with U0864 or should I stop immediately?

Driving with a U0864 code is not advisable, as it can lead to further complications. Issues such as stalling or loss of power could occur, potentially putting you in a dangerous situation. It's best to have the vehicle inspected as soon as possible.

How can I diagnose U0864 myself using GeekOBD APP?

To diagnose U0864 yourself, start by using the GeekOBD APP to scan for OBD2 codes. This tool will provide you with the U0864 code and any related codes. Take note of the freeze frame data to understand the conditions under which the error occurred. Next, visually inspect the wiring and connectors as recommended in the diagnostic steps.

What vehicles are most commonly affected by U0864?

Vehicles commonly affected by U0864 include the 2015-2019 Chevrolet Silverado and GMC Sierra. Other models from similar years with complex electronic systems can also experience this issue. Always check for any manufacturer recalls or Technical Service Bulletins (TSBs) related to communication errors.

How can I prevent U0864 from happening again?

To prevent U0864 from recurring, regularly inspect wiring and connectors for wear and corrosion. Ensure that your vehicle's battery maintains a good charge, and consider having software updates performed during routine maintenance checks.

What is U0864?

The DTC code U0864 indicates a communication error between modules in the vehicle's network. This code is often triggered when the Engine Control Module (ECM) fails to receive or send information to another control module, such as the Transmission Control Module (TCM) or Body Control Module (BCM). When there’s a disruption in the communication lines due to faulty wiring, connectors, or even a malfunctioning control module, you may experience various operational issues. For example, you might notice that certain features, like power windows or the anti-lock braking system (ABS), are not functioning correctly. In severe cases, the vehicle might enter 'limp mode' to protect its components, which can affect performance and drivability. This code is commonly found in vehicles like the 2015-2019 Chevrolet Silverado and GMC Sierra, where the intricate network of electronic modules plays a significant role in overall vehicle functionality. Ignoring this code could lead to further complications, making it essential to diagnose and address it promptly to ensure your vehicle operates smoothly.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0864 is present:

  • The check engine light is illuminated or flashing, indicating possible electronic issues.
  • Power features, like windows or locks, may fail to operate, causing driver frustration.
  • The vehicle may experience erratic behavior, such as stalling or loss of power during acceleration.
  • Warning messages may appear on the dashboard, alerting the driver to system malfunctions.
  • The vehicle may enter limp mode, limiting power and speed as a safety measure.

Possible Causes

Most common causes of U0864 (ordered by frequency):

  1. The most common cause is damaged wiring or connectors within the vehicle's communication network, with a likelihood of around 60%. This often occurs due to wear and tear or corrosion.
  2. A malfunctioning control module, such as the ECM or BCM, can cause a communication failure, accounting for about 25% of U0864 cases. This may require replacement or reprogramming.
  3. Poor battery voltage or connection issues can create communication errors, making up 10% of the causes. Regular battery checks and clean connections can prevent this.
  4. Less common, but serious, is water intrusion into electronic control units, which can cause widespread failures and may require extensive repairs.
  5. A rare cause might be software issues in the control modules, which can often be resolved with a software update from the manufacturer.

U0864 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repair of damaged wiring or connectors in the communication network.

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

Replacement of malfunctioning ECM or BCM with a new unit.

  • Total: $400 - $800
  • Success rate: 90%
Software Update

Performing a software update if a programming issue is identified.

  • Total: $50 - $150
  • Success rate: 75%
Money-Saving Tips for U0864
  • 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 U0864 Diagnosis Process

Follow these systematic steps to accurately diagnose U0864. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform an initial visual inspection to check for damaged wiring, loose connections, or corrosion, which should take about 5-10 minutes

Step 1: Perform an initial visual inspection to check for damaged wiring, loose connections, or corrosion, which should take about 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: Use the GeekOBD APP to conduct an OBD2 scan and retrieve all codes along with freeze frame data to gain context about the fault

Step 2: Use the GeekOBD APP to conduct an OBD2 scan and retrieve all codes along with freeze frame data to gain context about the fault. This step should take 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: Conduct component testing using a multimeter or other diagnostic tools to evaluate suspected modules and wiring integrity

Step 3: Conduct component testing using a multimeter or other diagnostic tools to evaluate suspected modules and wiring integrity. Expect this to take 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: After repairs, perform a system function test to verify proper operation and clear the codes, which should take about 10-15 minutes

Step 4: After repairs, perform a system function test to verify proper operation and clear the codes, which should take about 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 the vehicle under various conditions to confirm the success of the repairs

Step 5: Road test the vehicle under various conditions to confirm the success of the repairs. This should take 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: Repair Case: 2017 Chevrolet Silverado - U0864 Communication Error

Vehicle: 2017 Chevrolet Silverado, 65,000 miles

Problem: Customer reported intermittent power window failures and check engine light illuminated.

Diagnosis: After scanning with the GeekOBD APP, U0864 was found along with several other codes. A visual inspection revealed frayed wiring in the driver’s door harness.

Solution: Repaired the damaged wiring and reconnected the modules. Cleared the codes and performed a test drive.

Cost: $200 (wiring repair and diagnostic)

Result: All power windows functioned correctly post-repair, and the check engine light remained off.

Case Study 2: Repair Case: 2018 GMC Sierra - Module Replacement

Vehicle: 2018 GMC Sierra, 50,000 miles

Problem: Customer noticed the vehicle stalling and power features not responding.

Diagnosis: The GeekOBD APP revealed U0864, and testing indicated a malfunctioning ECM.

Solution: Replaced the ECM with a new unit and performed necessary programming.

Cost: $600 (ECM replacement and programming)

Result: The vehicle functioned normally after the repair, with no further issues reported.

Diagnose U0864

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Code Information

Code: U0864
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes