Quick Answer
U073A means: U073A indicates a communication failure between the PCM and TCM, affecting vehicle performance.
Can I drive with U073A? Immediate attention is recommended to prevent further damage and ensure safe vehicle operation.
Common Questions
What does U073A mean and how does it affect my car?
U073A is a diagnostic trouble code indicating a communication failure between your car's PCM and TCM. This can lead to erratic shifting, decreased performance, and potentially serious transmission issues if left unresolved.
What are the most common causes of U073A and how much does it cost to fix?
Common causes include wiring issues, a faulty TCM, and software glitches. Repair costs can range from $200 for wiring repairs to $1500 for TCM replacement, depending on the severity of the problem.
Can I drive my car with U073A or should I stop immediately?
It's best to avoid driving your vehicle if you see the U073A code, as it can lead to further damage. Immediate inspection is recommended to ensure safety and prevent breakdowns.
How can I diagnose U073A myself using GeekOBD APP?
Use the GeekOBD APP to scan for DTCs and check freeze frame data. Look for other related codes and review the vehicle's history to narrow down potential issues. This app can also help clear codes after repairs.
What vehicles are most commonly affected by U073A?
This code is frequently seen in 2015-2020 Ford F-150 models, but it can also appear in other vehicles with similar powertrain architectures, especially those relying heavily on electronic controls.
How can I prevent U073A from happening again?
Regular maintenance, including checking wiring and connections in the engine bay, can help prevent U073A. Keeping software updated and ensuring battery health can also reduce the risk of communication errors.
What is U073A?
The U073A diagnostic trouble code indicates an issue with the communication between the vehicle's control modules, specifically related to the vehicle's powertrain control module (PCM) and the transmission control module (TCM). This code can appear in various models, particularly 2015-2020 Ford F-150 trucks. When the vehicle’s onboard diagnostics system detects that the PCM is not able to communicate properly with the TCM, it triggers the U073A code. This communication failure can lead to a myriad of issues, including improper shifting, reduced engine performance, and in some cases, complete loss of power to the wheels. Drivers may notice warning lights on the dashboard, such as the check engine light, and may experience symptoms like erratic shifting or slipping gears. Over time, if not addressed, this issue can lead to more significant mechanical failures, making it essential to diagnose and repair the underlying problem as soon as possible. Understanding the root cause of U073A is critical for maintaining vehicle performance and safety, especially in light-duty trucks that rely heavily on electronic control systems for efficient operation.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U073A is present:
- The check engine light remains illuminated, indicating an underlying issue that needs attention.
- Drivers may notice the engine hesitating during acceleration, leading to inconsistent power delivery and responsiveness.
- Fuel economy may decrease significantly, with reports of up to a 15% drop due to improper engine management.
- Shifting between gears may feel rough or delayed, causing additional strain on the transmission.
- In severe cases, the vehicle may enter a 'limp mode', restricting power to prevent further damage.
Possible Causes
Most common causes of U073A (ordered by frequency):
- The most common cause is a faulty wiring harness or connector, which accounts for approximately 40% of U073A cases. Corrosion or damage can disrupt communication between modules.
- Another prevalent issue is a malfunctioning TCM, which can lead to communication errors with the PCM. This may require replacement or reprogramming.
- In some cases, software issues in the control modules can cause U073A. Regular updates may prevent these issues, so checking with the dealer for updates is advisable.
- Less common, but serious causes include internal transmission failures that can result in the need for costly repairs or replacements.
- A rare but possible cause is an issue with the vehicle's battery or charging system, affecting module communication due to insufficient voltage.
U073A Repair Costs
Cost Breakdown by Repair Type
Wiring Harness Repair
Repair or replacement of damaged wiring or connectors, ensuring proper communication.
- Total: $200 - $500
- Success rate: 80%
Transmission Control Module Replacement
Replacing a faulty TCM to restore communication with the PCM.
- Total: $800 - $1500
- Success rate: 90%
Money-Saving Tips for U073A
- 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 U073A Diagnosis Process
Follow these systematic steps to accurately diagnose U073A. 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 or specific diagnostic tools to test suspected components, focusing on the TCM and PCM connections (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on the TCM and PCM connections (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to see if they reappear (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes to see if they reappear (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful and that U073A does not return (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm that the repair was successful and that U073A does not return (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: Wiring Harness Repair on 2017 Ford F-150
Vehicle: 2017 Ford F-150, 65,000 miles
Problem: Customer reported check engine light and poor transmission performance.
Diagnosis: Initial scan revealed U073A. Visual inspection showed corrosion on the wiring harness.
Solution: Repaired the damaged wiring and replaced corroded connectors.
Cost: $350
Result: Post-repair, the check engine light was cleared, and the transmission performed smoothly.
Case Study 2: Transmission Control Module Replacement on 2019 Ford F-150
Vehicle: 2019 Ford F-150, 40,000 miles
Problem: Vehicle hesitated during acceleration and displayed U073A.
Diagnosis: Diagnostic testing confirmed a faulty TCM after several tests indicated no communication.
Solution: Replaced the TCM and reprogrammed it to the vehicle.
Cost: $1,200
Result: The vehicle regained proper shifting performance and the issue was resolved.