Quick Answer
C0627 means: C0627 indicates a malfunction in the trailer brake control module, affecting towing safety.
Can I drive with C0627? Immediate attention is recommended to ensure safe towing capabilities.
Common Questions
What does C0627 mean and how does it affect my car?
C0627 indicates a malfunction in the trailer brake control module, which can affect your ability to tow a trailer safely. If this module fails, your trailer brakes might not engage properly, leading to increased stopping distances and potential safety hazards while towing.
What are the most common causes of C0627 and how much does it cost to fix?
Common causes of C0627 include a faulty trailer brake control module, poor electrical connections, and software glitches in the ECU. Repair costs can range from $100 for wiring repairs to $600 for module replacement, depending on the issue's severity.
Can I drive my car with C0627 or should I stop immediately?
While you can drive your car with the C0627 code, it is not advisable, especially if you plan to tow a trailer. Ignoring this code can lead to serious safety risks, including brake failure while towing, so it’s best to address it as soon as possible.
How can I diagnose C0627 myself using GeekOBD APP?
To diagnose C0627 using GeekOBD APP, connect the app to your vehicle’s OBD2 port. Retrieve the DTCs and note any related codes. Check the freeze frame data for conditions present when the fault occurred, and follow the outlined diagnostic steps to pinpoint the issue.
What vehicles are most commonly affected by C0627?
C0627 is frequently reported in Ford F-Series trucks from 2011-2020 and GM vehicles like the Chevrolet Silverado and GMC Sierra from 2014-2020. These models are known for towing capabilities and may experience this code under heavy use.
How can I prevent C0627 from happening again?
To prevent C0627, regularly inspect your trailer brake system for wear and tear, ensure electrical connections are clean and secure, and maintain software updates for your vehicle’s ECU. Proper maintenance can help avoid future issues.
What is C0627?
The diagnostic trouble code (DTC) C0627 indicates a problem with the trailer brake control module (TBCM). This code is commonly found in various Ford and General Motors (GM) vehicles, particularly those from 2010 to 2020. The TBCM is responsible for controlling the braking system of a trailer that is being towed, ensuring that both the vehicle and the trailer can stop safely and effectively. When the C0627 code is triggered, it typically means that the TBCM has detected a malfunction within its circuits or has lost communication with the vehicle’s onboard computer system. This can lead to several issues, including impaired braking performance when towing a trailer, which poses a significant safety risk. In real-world scenarios, drivers may notice symptoms such as the trailer brake indicator light illuminating on the dashboard or a lack of response from the trailer brakes when activated. It’s essential to address this code promptly, as neglecting it can lead to more severe braking issues, increased wear on the vehicle, and potential accidents while towing.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0627 is present:
- The trailer brake indicator light remains illuminated on the dashboard, signaling a malfunction.
- Loss of braking power when the trailer brakes are engaged, leading to increased stopping distances.
- Erratic or inconsistent trailer brake performance, causing instability during towing.
- Vehicle stability control system may activate unexpectedly while towing, indicating a potential safety issue.
- Diagnostic tools reveal C0627 along with other related codes, suggesting a broader electrical issue.
Possible Causes
Most common causes of C0627 (ordered by frequency):
- The most common cause of C0627 is a faulty trailer brake control module, which can occur in about 60% of cases due to wear or electrical issues.
- Another prevalent cause is poor electrical connections, such as corroded connectors or damaged wiring harnesses, contributing to about 25% of cases.
- The third cause can be software glitches in the vehicle’s electronic control unit (ECU), which may require a software update to resolve.
- Less commonly, a malfunction in the vehicle's ABS system can lead to this code, affecting communication with the TBCM.
- A rare but possible cause is a complete failure of the vehicle’s body control module, which can disrupt multiple functions.
C0627 Repair Costs
Cost Breakdown by Repair Type
Trailer Brake Control Module Replacement
Replacing the faulty TBCM with a new unit. This includes reprogramming the module to ensure compatibility with the vehicle.
- Total: $300 - $600
- Success rate: 90%
Electrical Wiring Repair
Repairing corroded or damaged wiring and connectors in the trailer brake system.
- Total: $100 - $300
- Success rate: 75%
Money-Saving Tips for C0627
- 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 C0627 Diagnosis Process
Follow these systematic steps to accurately diagnose C0627. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Begin with an initial visual inspection
Step 1: Begin with an initial visual inspection. Check for any obvious signs such as damaged wiring, loose connections, or corrosion in the trailer brake system components (5-10 minutes).
Step 2: Step 2: Use an OBD2 scanner, like the GeekOBD APP, to retrieve the C0627 code and any additional codes
Step 2: Use an OBD2 scanner, like the GeekOBD APP, to retrieve the C0627 code and any additional codes. Review freeze frame data to understand the context of the fault (10-15 minutes).
Step 3: Step 3: Conduct component testing
Step 3: Conduct component testing. Use a multimeter to check the voltage and continuity of the TBCM and associated wiring (20-30 minutes).
Step 4: Step 4: Perform a system function test
Step 4: Perform a system function test. After any repairs, verify the proper operation of the trailer brake system and clear the codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Complete a road test
Step 5: Complete a road test. Drive the vehicle under various conditions while towing to confirm that the trailer brakes are functioning correctly (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: Ford F-150 Trailer Brake Control Module Replacement
Vehicle: 2018 Ford F-150, 45,000 miles
Problem: Customer reported the trailer brake light was illuminated and the brakes were unresponsive while towing.
Diagnosis: After scanning with GeekOBD APP, C0627 was identified along with other codes. Visual inspection revealed corroded connectors.
Solution: Replaced the trailer brake control module and repaired the wiring harness. Reprogrammed the new module.
Cost: $450 (module $300, wiring $150)
Result: Customer reported full functionality of trailer brakes and no further warning lights.
Case Study 2: Chevrolet Silverado Wiring Repair
Vehicle: 2016 Chevrolet Silverado 1500, 60,000 miles
Problem: Owner noticed intermittent trailer brake issues and C0627 code appeared during diagnostics.
Diagnosis: Inspection revealed damaged wiring due to abrasion against the frame.
Solution: Repaired the wiring and replaced connectors as needed. Cleared the codes and tested the system.
Cost: $200 (includes labor and parts)
Result: Successful repair with no further issues reported during testing.