B0688 - Diagnosis and Repair for Common 2015-2018 Ford and Lincoln Models

Quick Answer

B0688 means: B0688 indicates a malfunction in the driver's seat control module.

Fix: Check and replace faulty components Cost: $150 - $300 Time: 90-180 minutes

Can I drive with B0688? Address promptly to ensure safe driving conditions.

Common Questions

What does B0688 mean and how does it affect my car?

The B0688 code indicates a problem with your vehicle's seat control system, particularly related to the driver's power seat adjustments. If this code appears, it may prevent you from adjusting your seat properly, leading to discomfort and potential safety issues while driving.

What are the most common causes of B0688 and how much does it cost to fix?

Common causes of the B0688 code include a faulty seat position sensor, damaged wiring, or a malfunctioning seat control module. Repair costs can range from $100 to $500, depending on the specific issue and necessary repairs.

Can I drive my car with B0688 or should I stop immediately?

While you can technically drive your car with the B0688 code, it is advisable to address the issue promptly. Failing to do so could lead to discomfort while driving and potentially dangerous situations if your seat position is not secure.

How can I diagnose B0688 myself using GeekOBD APP?

To diagnose the B0688 code with the GeekOBD APP, connect the device to your vehicle’s OBD2 port and run a diagnostic scan. Look for the B0688 code among others, and review any freeze frame data to understand the conditions under which the fault occurred.

What vehicles are most commonly affected by B0688?

The B0688 code is commonly found in 2015-2018 Ford F-150, Ford Explorer, and Lincoln MKC models. It’s advisable to check for any recalls or technical service bulletins (TSBs) related to seat adjustments in these vehicles.

How can I prevent B0688 from happening again?

To prevent the B0688 code from recurring, ensure regular maintenance of your vehicle's electrical systems. Avoid applying excessive force when adjusting the seat and keep the seat area free of debris that could interfere with its operation.

What is B0688?

The Diagnostic Trouble Code (DTC) B0688 indicates an issue with the vehicle's seat control module, particularly related to the driver's power seat adjustments. This code is commonly encountered in various Ford and Lincoln models from 2015 to 2018. When the B0688 code is triggered, it typically means that the seat position sensor is malfunctioning or that there is a communication error between the seat module and the vehicle’s onboard computer system. In practical terms, this could prevent the driver from adjusting their seat to a comfortable position, which not only affects driving comfort but could also pose safety risks if the driver is not properly positioned to operate the vehicle. If left unresolved, other related systems may also be affected, leading to more extensive repairs down the line. This code might appear alongside other codes, indicating a broader issue with the vehicle's electrical system. Regular checks and maintenance can help catch these issues early, so it's advisable for car owners to monitor any warning lights and address them promptly.

System: B - Body (Airbags, Lighting, Security, Climate Control)

Symptoms

Common symptoms when B0688 is present:

  • The check engine light may illuminate, indicating a fault in the seat adjustment system.
  • The driver's seat may not adjust at all, causing discomfort and potentially unsafe driving positions.
  • The seat position memory function might fail, leading to repeated adjustments after each drive.
  • You might hear unusual clicking or grinding noises when attempting to move the seat, indicating mechanical issues.
  • In some cases, the seat position may randomly adjust on its own, which can be alarming while driving.

Possible Causes

Most common causes of B0688 (ordered by frequency):

  1. The most common cause of the B0688 code is a faulty seat position sensor, which has a likelihood of about 60%. This sensor is crucial for detecting the seat's position and sending that data to the control module.
  2. Second to that, wiring issues, such as damaged or corroded connectors, can disrupt communication between the seat control module and the vehicle's computer. These issues are often due to wear and tear over time.
  3. A third potential cause is a malfunctioning seat control module itself, which can occur due to internal component failure or electrical shorts. Preventive measures include regular inspections of electrical components.
  4. Less commonly, this code may arise from software glitches in the vehicle's body control module, which can sometimes be resolved with a software update.
  5. A rare but possible cause includes physical obstructions preventing the seat from moving, such as foreign objects lodged under the seat.

B0688 Repair Costs

Cost Breakdown by Repair Type

Seat Position Sensor Replacement

Replacing the faulty seat position sensor with a new part.

  • Total: $150 - $300
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring or connectors.

  • Total: $100 - $200
  • Success rate: 80%
Seat Control Module Replacement

Replacing the entire seat control module if the issue is internal.

  • Total: $250 - $500
  • Success rate: 85%
Money-Saving Tips for B0688
  • 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 B0688 Diagnosis Process

Follow these systematic steps to accurately diagnose B0688. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Begin with an initial visual inspection to check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)

Step 1: Begin with an initial visual inspection to 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: Use the GeekOBD APP to perform an OBD2 scan

Step 2: Use the GeekOBD APP to perform an OBD2 scan. 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: Conduct component testing on the seat position sensor and related wiring using a multimeter or specialized diagnostic tools (20-30 minutes)

Step 3: Conduct component testing on the seat position sensor and related wiring using a multimeter or specialized diagnostic tools (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: Perform a system function test to verify proper operation after any repairs and clear codes (10-15 minutes)

Step 4: Perform a system function test to verify proper operation after any 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: Conduct a road test to ensure the seat operates correctly under various driving conditions (15-20 minutes)

Step 5: Conduct a road test to ensure the seat operates correctly under various driving conditions (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: Seat Position Sensor Replacement in 2016 Ford Explorer

Vehicle: 2016 Ford Explorer, 45,000 miles

Problem: Customer reported that the driver's seat would not adjust, causing discomfort.

Diagnosis: After scanning the OBD2 system with GeekOBD APP, the B0688 code was found. Visual inspections revealed damaged wiring leading to the seat position sensor.

Solution: Replaced the seat position sensor and repaired the wiring harness.

Cost: $250 (sensor: $150, wiring repair: $100)

Result: The seat adjustments worked perfectly post-repair, and the customer reported improved comfort.

Case Study 2: Wiring Repair in 2017 Lincoln MKC

Vehicle: 2017 Lincoln MKC, 30,000 miles

Problem: Driver's seat adjustments were erratic, and the check engine light was illuminated.

Diagnosis: Diagnostic tests confirmed the B0688 code. Inspection showed corrosion in the seat wiring connections.

Solution: Cleaned the connections and replaced corroded wiring.

Cost: $150 (parts: $50, labor: $100)

Result: The seat functions were restored, and the check engine light was cleared.

Diagnose B0688

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: B0688
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: MEDIUM
Category: Body Codes