B0C38 - Common Issue in 2015-2020 Ford Explorer and F-150

Quick Answer

B0C38 means: B0C38 indicates a fault in the ambient light sensor circuit.

Fix: Check and replace faulty components Cost: $100 - $200 Time: 90-180 minutes

Can I drive with B0C38? While not immediately urgent, it should be addressed to ensure proper lighting functionality.

Common Questions

What does B0C38 mean and how does it affect my car?

The B0C38 code indicates a problem with your vehicle's ambient light sensor circuit. This sensor is crucial for automatically controlling your headlights and interior lighting. If this code appears, your lights may not function properly, especially in low-light conditions, which can compromise safety. Addressing this issue can restore proper functionality and ensure safe driving at night.

What are the most common causes of B0C38 and how much does it cost to fix?

The most common cause of B0C38 is a faulty ambient light sensor, which typically costs between $100-$200 to replace. Other causes include wiring issues and BCM software glitches, with repair costs varying based on the complexity of the issue. Expect a range of $50 for software updates to $300 for extensive wiring repairs.

Can I drive my car with B0C38 or should I stop immediately?

You can drive your vehicle with the B0C38 code, but it is advisable to address the issue promptly. Driving without properly functioning lights at night can pose safety risks. It’s best to have a professional diagnose and repair the issue as soon as possible.

How can I diagnose B0C38 myself using GeekOBD APP?

To diagnose the B0C38 code using the GeekOBD APP, first connect the app to your vehicle's OBD-II port. Perform a full vehicle scan to retrieve the DTCs, and review the freeze frame data for context. Pay special attention to the ambient light sensor readings and check for any accompanying codes that may indicate related issues.

What vehicles are most commonly affected by B0C38?

The B0C38 code is commonly found in 2015-2020 Ford Explorer and F-150 models. These vehicles are known to experience issues with the ambient light sensor circuit due to their electrical system design. It's advisable to check for any Technical Service Bulletins (TSBs) related to this code for your specific make and model.

How can I prevent B0C38 from happening again?

To prevent B0C38 from recurring, regularly inspect your vehicle's wiring and connectors for signs of wear or corrosion. Keeping the ambient light sensor clean and ensuring it is properly mounted can also help. Additionally, consider having software updates performed during routine maintenance to prevent potential glitches.

What is B0C38?

The diagnostic trouble code (DTC) B0C38 is part of the body control module (BCM) diagnostics, specifically relating to the vehicle's lighting system. It indicates a malfunction with the 'Ambient Light Sensor Circuit'. This code is prevalent in vehicles such as the Ford Explorer and F-150 manufactured between 2015 and 2020. When this code is triggered, it suggests that the BCM has detected an issue with the ambient light sensor, which affects the automatic control of headlights and interior lighting. This can lead to various issues, including headlights not turning on or off appropriately, and may even cause interior lights to malfunction. In practical terms, if you find that your vehicle's lights are not behaving as expected, or if you notice a dashboard warning light, it could be due to this issue. Ignoring the B0C38 code can lead to further electrical problems or even safety hazards while driving at night. Therefore, addressing this code promptly is crucial for maintaining both vehicle performance and safety.

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

Symptoms

Common symptoms when B0C38 is present:

  • Check engine light illuminates and stays on, indicating a system fault.
  • Headlights fail to adjust automatically based on ambient light, leading to potential visibility issues.
  • Interior lights malfunction, either staying on or failing to turn on when needed.
  • Dashboard warning lights may appear, signaling a broader electrical issue.
  • Increased electrical system load, which may drain the battery faster than normal.

Possible Causes

Most common causes of B0C38 (ordered by frequency):

  1. Faulty ambient light sensor - 60% likelihood. This is the most common cause, where the sensor itself may malfunction due to wear or damage.
  2. Wiring issues - 20% likelihood. Damaged or corroded wiring can disrupt the signal sent to the BCM.
  3. BCM software glitch - 10% likelihood. In some cases, the BCM may require a software update to correct erroneous readings.
  4. Ground connection problems - 5% likelihood. Poor grounding can affect sensor performance and circuit integrity.
  5. Less common issues with the headlight switch - 5% likelihood. Rarely, the switch controlling the headlights may be faulty, leading to circuit issues.

B0C38 Repair Costs

Cost Breakdown by Repair Type

Sensor Replacement

Replace the faulty ambient light sensor with a new OEM part.

  • Total: $100 - $200
  • Success rate: 85%
Wiring Repair

Repair or replace damaged wiring harness related to the ambient light sensor.

  • Total: $150 - $300
  • Success rate: 75%
BCM Software Update

Update the BCM software to correct any glitches.

  • Total: $50 - $100
  • Success rate: 70%
Money-Saving Tips for B0C38
  • 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 B0C38 Diagnosis Process

Follow these systematic steps to accurately diagnose B0C38. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Step 1: Perform a visual inspection - Look for damaged wiring or corroded connectors related to the ambient light sensor (5-10 minutes)

Step 1: Perform a visual inspection - Look for damaged wiring or corroded connectors related to the ambient light sensor (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 scan for all stored codes - Retrieve DTCs and check freeze frame data to understand the code context (10-15 minutes)

Step 2: Use the GeekOBD APP to scan for all stored codes - Retrieve DTCs and check freeze frame data to understand the code 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: Test the ambient light sensor - Use a multimeter to check the sensor's voltage and resistance against manufacturer specifications (20-30 minutes)

Step 3: Test the ambient light sensor - Use a multimeter to check the sensor's voltage and resistance against manufacturer specifications (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: Inspect the BCM - Ensure that it is not damaged and check for any software updates if necessary (10-15 minutes)

Step 4: Inspect the BCM - Ensure that it is not damaged and check for any software updates if necessary (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 functional test - After making any repairs, clear the DTCs and verify the operation of the lighting system (15-20 minutes)

Step 5: Conduct a functional test - After making any repairs, clear the DTCs and verify the operation of the lighting system (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: Ambient Light Sensor Replacement in 2018 Ford Explorer

Vehicle: 2018 Ford Explorer, 45,000 miles

Problem: Customer reported that the headlights would not turn on automatically, and the dashboard warning light was illuminated.

Diagnosis: Diagnostic steps revealed B0C38 stored in the BCM. A visual inspection of the sensor and wiring indicated significant wear.

Solution: Replaced the ambient light sensor with an OEM part and repaired a corroded connector.

Cost: $180 (parts $100, labor $80)

Result: After the repair, the vehicle's lighting system functioned correctly, and the warning light was cleared.

Case Study 2: Wiring Repair on 2019 Ford F-150

Vehicle: 2019 Ford F-150, 30,000 miles

Problem: Customer complained that interior lights would flicker and headlights did not adjust automatically.

Diagnosis: B0C38 was found along with intermittent wiring issues during the diagnostic process.

Solution: Repaired the damaged wiring harness connected to the ambient light sensor.

Cost: $250 (parts $150, labor $100)

Result: Post-repair, the interior and exterior lights operated seamlessly, resolving the customer's concerns.

Diagnose B0C38

Use GeekOBD APP for professional diagnosis!

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  • Professional-grade analysis
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Code Information

Code: B0C38
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: MEDIUM
Category: Body Codes