Quick Answer
U0687 means: U0687 indicates a communication error between vehicle control modules.
Can I drive with U0687? Immediate attention is recommended to avoid further complications.
Common Questions
What does U0687 mean and how does it affect my car?
DTC U0687 indicates that there is a communication failure between your vehicle's control modules. This can lead to performance issues like poor engine response, reduced fuel economy, and malfunctioning electronic systems. Ignoring this code could result in more severe problems, affecting the safety and drivability of your vehicle.
What are the most common causes of U0687 and how much does it cost to fix?
Common causes of U0687 include damaged wiring harnesses, faulty control modules, and loose connections. Repair costs can vary, typically ranging from $150 to $1,200 depending on the nature of the issue and parts needed.
Can I drive my car with U0687 or should I stop immediately?
It’s advisable to stop driving your vehicle if you encounter U0687, as ongoing use can exacerbate the issue and lead to more serious malfunctions or safety concerns.
How can I diagnose U0687 myself using GeekOBD APP?
Using the GeekOBD APP, you can perform a comprehensive scan of your vehicle's systems. Look for the U0687 code and any related codes. Pay attention to freeze-frame data to identify when the problem occurs, which can assist in pinpointing the underlying issue.
What vehicles are most commonly affected by U0687?
DTC U0687 is commonly found in 2015-2018 Ford F-150, Ford Explorer, and Lincoln MKC models. These vehicles may experience communication issues due to design or manufacturing flaws, leading to related recalls or technical service bulletins.
How can I prevent U0687 from happening again?
Regular maintenance is key to preventing U0687. Schedule routine inspections of wiring and connectors, keep your battery and alternator in good condition, and ensure that all software is updated to the latest versions to avoid communication errors.
What is U0687?
The diagnostic trouble code (DTC) U0687 indicates a communication error between control modules in your vehicle, particularly in models like the 2015-2018 Ford F-150 and Lincoln MKC. This code is triggered when the Engine Control Module (ECM) or Powertrain Control Module (PCM) detects that a response from another module is missing or invalid. In practical terms, this means that your vehicle's different electronic systems, such as engine, transmission, and other control modules, are not communicating effectively, which can lead to performance issues and malfunctions. The implications of ignoring this code can be significant, potentially leading to poor fuel economy, erratic engine behavior, or even safety concerns if critical systems fail to operate as intended. It’s essential for car owners to understand that this issue can affect various components, including the anti-lock braking system (ABS), traction control, and stability control systems. Therefore, addressing the U0687 code promptly is crucial to ensure your vehicle operates smoothly and safely.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0687 is present:
- The check engine light may stay on constantly, alerting you to an underlying issue.
- You might notice that the engine hesitates during acceleration, making driving less smooth.
- Fuel economy could decrease by 10-15%, impacting your overall cost of ownership.
- Erratic behavior of electronic components, such as inconsistent dashboard readings.
- In some cases, you may experience issues with cruise control not functioning properly.
Possible Causes
Most common causes of U0687 (ordered by frequency):
- The most common cause is a faulty or damaged wiring harness, accounting for about 40% of cases. This can occur due to wear and tear or exposure to moisture.
- Another frequent cause is a malfunctioning control module, which may stop sending or receiving signals correctly due to internal failures.
- A loose or corroded connection can also disrupt communication between modules, so regular maintenance checks can help prevent this.
- Less commonly, software glitches within the control modules can lead to communication failures, necessitating software updates.
- In rare cases, issues with the battery or alternator can lead to voltage fluctuations that affect module communication.
U0687 Repair Costs
Cost Breakdown by Repair Type
Wiring Harness Repair/Replacement
Repairing or replacing damaged wiring can restore proper communication between modules.
- Total: $150 - $600
- Success rate: 85%
Control Module Replacement
Replacing a faulty control module to ensure reliable communication.
- Total: $300 - $1,200
- Success rate: 90%
Money-Saving Tips for U0687
- 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 U0687 Diagnosis Process
Follow these systematic steps to accurately diagnose U0687. 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 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).
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).
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).
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 Ford F-150 U0687 Repair Case
Vehicle: 2016 Ford F-150, 45,000 miles
Problem: Customer reported check engine light was on and engine performance was erratic.
Diagnosis: After scanning with the GeekOBD APP, U0687 was confirmed. Visual inspection revealed a damaged wiring harness near the engine.
Solution: Repaired the wiring harness and cleared the code. Conducted a system function test to verify repairs.
Cost: $250 for wiring repair.
Result: Customer reported improved engine performance and no reoccurrence of the check engine light.
Case Study 2: 2017 Lincoln MKC U0687 Issue
Vehicle: 2017 Lincoln MKC, 30,000 miles
Problem: Vehicle experienced intermittent power loss and dashboard warning lights.
Diagnosis: DTC U0687 was found using the GeekOBD APP along with other codes indicating module communication failures.
Solution: Replaced the primary control module and updated the vehicle software.
Cost: $800 for the control module replacement.
Result: All systems returned to normal functionality with no further issues reported.