Quick Answer
U0373 means: U0373 indicates a communication issue between the engine and transmission control modules.
Can I drive with U0373? It is crucial to address this code immediately to avoid transmission damage.
Common Questions
What does U0373 mean and how does it affect my car?
The U0373 code indicates that there is a communication failure between your vehicle's engine and transmission control modules. This can lead to poor shifting performance, reduced power, and possibly even leaving your vehicle in limp mode. Over time, ignoring this issue can cause further damage to your transmission system.
What are the most common causes of U0373 and how much does it cost to fix?
Common causes of U0373 include faulty wiring or connectors, a malfunctioning transmission control module, and software issues. Repair costs can range from $150 for wiring repairs to over $1200 for full module replacements. Always consult a trusted mechanic for an accurate diagnosis.
Can I drive my car with U0373 or should I stop immediately?
While you may be able to drive your car with a U0373 code, it is not advisable. Continuing to drive could result in more severe transmission issues and costly repairs. It’s best to have your vehicle inspected as soon as possible.
How can I diagnose U0373 myself using GeekOBD APP?
To diagnose U0373 using the GeekOBD APP, connect your OBD-II scanner, run a complete scan, and check for any additional codes that may provide context to the U0373. Freeze frame data will give you insights into the vehicle's conditions when the code was triggered.
What vehicles are most commonly affected by U0373?
Commonly affected vehicles include the 2015-2018 Ford F-150 and similar models within the Ford lineup. Be sure to check for any recalls or technical service bulletins related to transmission issues for these vehicles.
How can I prevent U0373 from happening again?
To prevent U0373 from recurring, ensure regular maintenance checks, particularly for your vehicle's wiring and connections. Additionally, keeping the vehicle's software updated can prevent communication issues.
What is U0373?
The diagnostic trouble code (DTC) U0373 refers to a communication error between the vehicle's engine control module (ECM) and the transmission control module (TCM). When this code is triggered, it indicates that the ECM is unable to properly communicate with the TCM, which can lead to various performance issues. This type of problem is often caused by faulty wiring, bad connectors, or a malfunctioning module. For car owners, this means that your vehicle may experience erratic shifting, reduced acceleration, or even go into 'limp' mode, which restricts engine power to prevent further damage. The U0373 code is particularly common in certain models of Ford, such as the 2015-2018 Ford F-150, where owners have reported issues relating to transmission performance. If you see this code, it's essential to address it promptly, as ignoring it can lead to further complications, including complete transmission failure. Regular maintenance and checks can help prevent this code from appearing, especially if you notice any symptoms of transmission issues.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0373 is present:
- Check engine light stays on constantly, indicating a persistent issue with vehicle communication.
- Transmission may experience erratic shifting, such as harsh or delayed engagement when changing gears.
- Engine hesitates during acceleration, making it difficult to maintain speed under load.
- Fuel economy decreased by 10-15%, noticeably affecting your wallet at the pump.
- Vehicle may enter 'limp mode', restricting engine power to prevent damage.
Possible Causes
Most common causes of U0373 (ordered by frequency):
- Faulty wiring or connectors (60% likelihood) - Damaged or corroded wires can interrupt communication.
- Malfunctioning transmission control module (30% likelihood) - A defective TCM may fail to send or receive signals.
- Software issues (5% likelihood) - Outdated or corrupted software in the ECM or TCM can lead to communication errors.
- Less common but serious cause - A failing engine control module that needs replacement.
- Rare but possible cause - Issues with other related systems, such as the vehicle's CAN bus.
U0373 Repair Costs
Cost Breakdown by Repair Type
Wiring and Connector Repair
Repairing or replacing damaged wires and connectors that are causing the communication error.
- Total: $150 - $400
- Success rate: 80%
Transmission Control Module Replacement
Replacing a faulty transmission control module that is not functioning correctly.
- Total: $700 - $1200
- Success rate: 90%
ECM Reprogramming
Reprogramming the engine control module if software issues are identified.
- Total: $100 - $300
- Success rate: 75%
Money-Saving Tips for U0373
- 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 U0373 Diagnosis Process
Follow these systematic steps to accurately diagnose U0373. 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 suspected components for proper voltage and continuity (20-30 minutes)
Step 3: Component testing - Use a multimeter to test suspected components for proper voltage and continuity (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes to reset the system (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes to reset the system (10-15 minutes).
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success (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: Transmission Control Module Replacement on 2016 Ford F-150
Vehicle: 2016 Ford F-150, 45,000 miles
Problem: Customer reported erratic shifting and check engine light illumination.
Diagnosis: After scanning, U0373 was found. Visual inspection revealed corroded connectors.
Solution: Replaced the corroded connectors and installed a new transmission control module.
Cost: $900 (including parts and labor)
Result: Post-repair, the transmission shifted smoothly, and the check engine light remained off.
Case Study 2: Wiring Repair on 2017 Ford Escape
Vehicle: 2017 Ford Escape, 30,000 miles
Problem: Customer experienced poor acceleration and a lit check engine light.
Diagnosis: Diagnostic scan revealed U0373; further inspection found damaged wiring.
Solution: Repaired the damaged wiring and confirmed the integrity of the connections.
Cost: $200 (for wiring repair)
Result: Vehicle performance improved significantly, with no further codes present.