Quick Answer
C0973 means: DTC C0973 indicates a malfunction in the trailer brake control module, often related to wiring or module issues.
Can I drive with C0973? Immediate attention is needed to prevent reduced braking effectiveness while towing.
Common Questions
What does C0973 mean and how does it affect my car?
C0973 indicates a problem with your vehicle's trailer brake control module. This can lead to unsafe towing conditions as the trailer brakes may not engage properly, increasing braking distances and the risk of accidents.
What are the most common causes of C0973 and how much does it cost to fix?
The most common causes of C0973 include wiring issues and a faulty trailer brake control module. Repair costs can range from $100 for wiring repairs to $500 for module replacement.
Can I drive my car with C0973 or should I stop immediately?
It's advisable to stop driving and address the C0973 code immediately, especially if you plan to tow anything. Reduced braking capabilities can increase the risk of accidents.
How can I diagnose C0973 myself using GeekOBD APP?
Using the GeekOBD APP, you can read the DTC codes, view freeze frame data, and perform live data monitoring to assess the performance of the trailer brake system. Look for voltage readings and any anomalies.
What vehicles are most commonly affected by C0973?
DTC C0973 is frequently found in 2015-2019 Ford F-150 models and other Ford trucks equipped with trailer brake controllers. Always check for recalls or technical service bulletins (TSBs) related to your vehicle.
How can I prevent C0973 from happening again?
Regularly inspect and maintain the wiring and connectors of your trailer brake system. Ensure that connections are clean and secure, and consider having the trailer brake control module checked during routine maintenance.
What is C0973?
DTC C0973 is a diagnostic trouble code that indicates a problem with the vehicle's trailer brake control module. This code is particularly prevalent in various Ford models, including the 2015-2019 Ford F-150, but can also appear in other vehicles equipped with trailer brake systems. When this code is triggered, it typically points to issues with the wiring, connections, or the module itself, which can lead to decreased functionality of trailer brakes. The trailer brake control module is crucial for safely operating a vehicle while towing, as it ensures that the trailer brakes engage simultaneously with the vehicle brakes. Ignoring this code can result in poor braking performance, increased stopping distances, and a heightened risk of accidents while towing. Drivers may notice that their trailer brakes are not activating properly or that the brake light on the dashboard remains illuminated. Addressing this issue promptly is essential for maintaining safe driving conditions, particularly for those who frequently haul trailers or heavy loads. Overall, DTC C0973 signifies a serious concern that requires immediate attention to ensure the safety and reliability of your vehicle while towing.
System: C - Chassis (ABS, Steering, Suspension)
Symptoms
Common symptoms when C0973 is present:
- The check engine light or brake warning light stays on, indicating an issue with the braking system.
- The trailer brakes do not engage when the vehicle brakes are applied, which can lead to unsafe towing conditions.
- Drivers may experience increased stopping distances, making it harder to control the vehicle while towing a trailer.
- Inconsistent trailer brake performance, such as brakes activating sporadically or not at all.
- Electrical issues, such as blown fuses related to the trailer brake system, may also accompany this code.
Possible Causes
Most common causes of C0973 (ordered by frequency):
- Wiring issues in the trailer brake control circuit are the most common cause (60% likelihood). This can include frayed wires, poor connections, or corrosion.
- A faulty trailer brake control module itself is the second most common cause (25% likelihood). This module can fail due to age or manufacturing defects.
- Improperly connected trailer wiring is another potential cause (10% likelihood). Ensuring all connectors are secure and free from corrosion can prevent this.
- Less common but serious causes include software malfunctions in the vehicle’s computer system (3% likelihood), which may require a software update.
- Rarely, physical damage to the vehicle’s electrical harness or connectors could be the source of the problem (2% likelihood).
C0973 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repair or replace damaged wiring and connectors in the trailer brake control circuit.
- Total: $100 - $250
- Success rate: 85%
Trailer Brake Control Module Replacement
Replace the faulty trailer brake control module with a new or refurbished unit.
- Total: $250 - $500
- Success rate: 90%
Money-Saving Tips for C0973
- 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 C0973 Diagnosis Process
Follow these systematic steps to accurately diagnose C0973. 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 to test the voltage at the trailer brake control module and inspect for continuity (20-30 minutes)
Step 3: Component testing - Use a multimeter to test the voltage at the trailer brake control module and inspect for continuity (20-30 minutes).
Step 4: Step 4: System function test - Verify that the trailer brake engages correctly after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify that the trailer brake engages correctly after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle while towing under various conditions to confirm that the trailer brakes function properly (15-20 minutes)
Step 5: Road test verification - Drive the vehicle while towing under various conditions to confirm that the trailer brakes function properly (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: Trailer Brake Control Module Replacement in a 2016 Ford F-150
Vehicle: 2016 Ford F-150, 50,000 miles
Problem: Customer reported that the trailer brakes failed to engage while towing.
Diagnosis: After scanning with the GeekOBD APP, the C0973 code was retrieved. A visual inspection revealed corroded wiring leading to the trailer brake control module.
Solution: Replaced the corroded wiring and the trailer brake control module. Cleared codes and verified proper function.
Cost: $400 (includes parts and labor)
Result: Trailer brakes functioned correctly after repairs, and the customer reported no further issues.
Case Study 2: Wiring Repair on a 2017 Ford Explorer
Vehicle: 2017 Ford Explorer, 30,000 miles
Problem: Driver experienced intermittent trailer brake activation.
Diagnosis: Diagnostic testing revealed C0973, and a thorough inspection uncovered frayed wiring near the connector.
Solution: Repaired the damaged wiring and secured all connections. Conducted a system test to ensure functionality.
Cost: $150 (parts and labor)
Result: Resolved the issue, and the trailer brakes now engage consistently.