B1622 - Understanding the Body Control Module Error in 2000-2022 Chevrolet and GMC Vehicles

Quick Answer

B1622 means: B1622 indicates a fault in the Body Control Module, affecting vehicle electrical systems.

Fix: Check and replace faulty components Cost: $200 - $600 Time: 90-180 minutes

Can I drive with B1622? Immediate attention is recommended to avoid electrical failures.

Common Questions

What does B1622 mean and how does it affect my car?

B1622 indicates a problem with the Body Control Module, which manages lighting, locks, and other electrical functions. If left unresolved, it can lead to further electrical failures and affect vehicle safety.

What are the most common causes of B1622 and how much does it cost to fix?

Common causes include a faulty BCM, wiring issues, and poor connections. Repair costs can range from $100 for wiring repairs to $600 for BCM replacement.

Can I drive my car with B1622 or should I stop immediately?

While you may be able to drive, it is not recommended. Addressing B1622 promptly is crucial to prevent potential safety issues.

How can I diagnose B1622 myself using GeekOBD APP?

Use the GeekOBD APP to scan for codes, view live data, and monitor the vehicle's electrical systems. This will help you identify the specific symptoms and conditions causing the B1622 code.

What vehicles are most commonly affected by B1622?

B1622 is commonly found in Chevrolet and GMC models from 2000 to 2022, particularly in the Silverado, Tahoe, and Sierra series.

How can I prevent B1622 from happening again?

Regular maintenance of electrical systems, ensuring proper connections, and addressing any signs of wear early can help prevent future occurrences of B1622.

What is B1622?

The diagnostic trouble code (DTC) B1622 refers to an issue with the Body Control Module (BCM), which is a crucial component in managing various electrical systems in your vehicle, particularly in models from Chevrolet and GMC manufactured between 2000 and 2022. This code indicates a malfunction within the BCM or its communication with other modules in the vehicle. When the BCM detects a problem, it may trigger warning lights on your dashboard, such as the check engine light or service vehicle soon light. In practical terms, if you're facing B1622, you might experience issues such as malfunctioning power windows, non-responsive door locks, or problems with the vehicle’s lighting systems. Ignoring this code can lead to further electrical issues, potentially affecting your vehicle's safety features. It’s essential to address this promptly to avoid complications. Always consult a professional or use diagnostic tools like the GeekOBD APP to monitor your vehicle’s performance and understand the context of this trouble code in relation to other existing codes.

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

Symptoms

Common symptoms when B1622 is present:

  • Check engine light stays on constantly, indicating a persistent issue with the BCM.
  • Power windows may stop working intermittently, leading to inconvenience and frustration.
  • Door locks function erratically, often failing to lock or unlock as intended, risking vehicle security.
  • Interior lights may flicker or fail to illuminate, creating visibility issues at night.
  • Dashboard warning lights appear unexpectedly, signaling potential malfunctions in your vehicle's electrical systems.

Possible Causes

Most common causes of B1622 (ordered by frequency):

  1. Faulty Body Control Module (BCM) - This is the most common cause, accounting for about 50% of B1622 codes. The BCM can fail due to wear and tear over time, especially in vehicles over 100,000 miles.
  2. Wiring issues - Damaged or corroded wiring connected to the BCM can lead to communication failures. This is often seen in older vehicles or those exposed to harsh environments.
  3. Poor connections - Loose or oxidized connectors can interrupt signals to and from the BCM, leading to intermittent issues.
  4. Short circuit - A short circuit in the electrical system can trigger this code, though it is less common. This may require more extensive diagnostics.
  5. Software glitches - Occasionally, a software update or reprogramming of the BCM is necessary to resolve the issue.

B1622 Repair Costs

Cost Breakdown by Repair Type

BCM Replacement

Replacing a faulty Body Control Module with a new or refurbished unit.

  • Total: $200 - $600
  • Success rate: 90%
Wiring Repair

Repairing or replacing damaged wiring linked to the BCM.

  • Total: $100 - $300
  • Success rate: 85%
Money-Saving Tips for B1622
  • 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 B1622 Diagnosis Process

Follow these systematic steps to accurately diagnose B1622. Each step builds on the previous one to ensure accurate diagnosis.

Step 1: Initial visual inspection - 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: OBD2 scan with GeekOBD APP - 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: Component testing - Use a multimeter or specific diagnostic tools to test suspected components like the BCM and associated wiring (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: System function test - Verify proper operation after 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: Road test verification - Drive vehicle under various conditions to confirm repair success (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: BCM Replacement in a 2015 Chevrolet Tahoe

Vehicle: 2015 Chevrolet Tahoe, 75,000 miles

Problem: Customer reported intermittent power window failure and dashboard warning lights.

Diagnosis: After scanning with GeekOBD APP, B1622 was the only code present. Visual inspection revealed corrosion at the BCM connector.

Solution: Replaced the Body Control Module and cleaned the connectors.

Cost: $450 (BCM $350, labor $100)

Result: Post-repair, all electrical functions restored, and warning lights cleared.

Case Study 2: Wiring Repair in a 2008 GMC Sierra

Vehicle: 2008 GMC Sierra, 120,000 miles

Problem: Customer experienced non-functional door locks and flickering interior lights.

Diagnosis: B1622 was logged. Inspection showed frayed wiring near the BCM.

Solution: Repaired the damaged wiring and replaced a few connectors.

Cost: $200 (wiring $150, labor $50)

Result: Resolved issues with door locks and interior lighting, no further codes appeared.

Diagnose B1622

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: B1622
System: Body (Airbags, Lighting, Security, Climate Control)
Severity: HIGH
Category: Body Codes