Quick Answer
U087B means: U087B indicates a communication failure between vehicle control modules.
Can I drive with U087B? Immediate attention is recommended to prevent further issues.
Common Questions
What does U087B mean and how does it affect my car?
The U087B code indicates a communication failure between vehicle control modules, which can lead to various issues in vehicle performance and functionality. If left unresolved, it may affect critical systems like the engine or brakes, posing safety risks.
What are the most common causes of U087B and how much does it cost to fix?
Common causes include damaged wiring (60% likelihood), faulty modules, and software issues. Repair costs can range from $100 for wiring repairs to $800 for module replacements, depending on the specific issue.
Can I drive my car with U087B or should I stop immediately?
While you may be able to drive your car, it's not advisable due to potential safety risks and further damage to the vehicle. It's best to have it diagnosed and repaired as soon as possible.
How can I diagnose U087B myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for trouble codes, view freeze frame data, and monitor real-time data from various modules. Look for inconsistencies in communication and check for any active codes related to U087B.
What vehicles are most commonly affected by U087B?
The U087B code is commonly seen in models like the 2013-2019 Chevrolet Silverado and GMC Sierra, as well as other GM vehicles within that production range. It's advisable to check for any recalls or technical service bulletins related to your specific vehicle.
How can I prevent U087B from happening again?
Regular maintenance, including inspections of electrical connections and wiring, can help prevent U087B. Additionally, ensuring that all software updates are applied can minimize the risk of communication failures.
What is U087B?
The U087B diagnostic trouble code indicates that there is a problem with the communication between the Vehicle Control Module (VCM) and another module, usually within a network of components like the engine control unit or transmission control module. This code is common in vehicles like the 2013-2019 Chevrolet Silverado and GMC Sierra. When the vehicle's onboard diagnostics system detects that a module has failed to respond or communicate as expected, it triggers this code. The implications of U087B can range from minor inconveniences, such as the malfunction indicator lamp (MIL) illuminating, to more severe issues like loss of vehicle performance or even failure of critical vehicle systems. If not addressed, this can affect your vehicle's drivability, safety features, and overall performance. It's important to understand that communication failures can arise from various sources, including damaged wiring, faulty sensors, or a malfunctioning control module. Therefore, diagnosing and fixing this issue promptly is crucial for maintaining your vehicle's functionality and ensuring a safe driving experience.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U087B is present:
- Check engine light stays on constantly, indicating a potential issue with the vehicle's communication systems.
- Driver may notice erratic behavior of the vehicle's electrical components, such as flickering dashboard lights or unresponsive controls.
- Fuel economy decreased by 10-15%, indicating that the vehicle may not be operating efficiently due to communication issues.
- Difficulty starting the engine or engine misfires, which may occur if the engine control module cannot communicate properly with other critical systems.
- Loss of power steering or braking assistance, which may indicate a severe failure in the vehicle's communication network.
Possible Causes
Most common causes of U087B (ordered by frequency):
- Most common cause is damaged wiring or connectors, accounting for about 60% of U087B cases. This often results from wear and tear, corrosion, or physical damage.
- Second most common cause is a faulty module, which can lead to a complete communication breakdown. A malfunctioning control unit may fail to send or receive signals.
- Third cause could be software malfunctions, such as outdated firmware in the vehicle's modules. Regular updates can prevent this issue.
- Less common but serious cause involves short circuits in the wiring harness, which can lead to widespread electrical failures if not addressed.
- Rare but possible cause is interference from aftermarket electronic devices, which might disrupt the normal communication channels within the vehicle.
U087B Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repair of damaged wiring or connectors that are affecting communication.
- Total: $100 - $300
- Success rate: 90%
Module Replacement
Replacing a faulty control module that is not communicating properly.
- Total: $300 - $800
- Success rate: 95%
Money-Saving Tips for U087B
- 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 U087B Diagnosis Process
Follow these systematic steps to accurately diagnose U087B. 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).
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).
Step 3: Step 3: Component testing - Use a multimeter to test suspected components and wiring for continuity and resistance (20-30 minutes)
Step 3: Component testing - Use a multimeter to test suspected components and wiring for continuity and resistance (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to see if they return (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes to see if they return (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure all systems are functioning normally (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and ensure all systems are functioning normally (15-20 minutes).
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: Wiring Repair Success on 2015 Chevrolet Silverado
Vehicle: 2015 Chevrolet Silverado 1500, 75,000 miles
Problem: Customer reported the check engine light was on and experienced intermittent loss of power steering.
Diagnosis: Initial scan revealed U087B. Visual inspection found frayed wiring harness near the steering column.
Solution: Repaired damaged wiring and secured connections. Cleared codes and performed system tests.
Cost: $150 for wiring repair.
Result: Customer reported that the check engine light remained off and power steering functioned normally after repair.
Case Study 2: Module Replacement on 2017 GMC Sierra
Vehicle: 2017 GMC Sierra 1500, 50,000 miles
Problem: Vehicle would not start, and multiple dashboard lights were illuminated.
Diagnosis: OBD2 scan indicated U087B along with other codes suggesting module communication failure.
Solution: Replaced the engine control module and reprogrammed it to the vehicle.
Cost: $600 for module replacement.
Result: Vehicle started immediately after the repair, with all dashboard lights returning to normal.