Quick Answer
U0735 means: DTC U0735 indicates a loss of communication in the vehicle's CAN, specifically related to the transmission control module.
Can I drive with U0735? It's recommended to address this issue immediately to prevent further damage to the vehicle.
Common Questions
What does U0735 mean and how does it affect my car?
DTC U0735 signifies a communication issue within the vehicle's electronic systems, specifically between the transmission control module and other components. This can lead to poor performance, erratic shifting, and reduced fuel efficiency. Addressing this code promptly is crucial to maintain your vehicle's drivability and safety.
What are the most common causes of U0735 and how much does it cost to fix?
Common causes include faulty transmission control modules, corroded connectors, or wiring issues. Repair costs can range from $100 for wiring repairs to $1500 for a TCM replacement, depending on the issue's severity.
Can I drive my car with U0735 or should I stop immediately?
It's advisable to stop driving your car immediately if the U0735 code is present. Continuing to drive can lead to further damage to the transmission and other components, resulting in higher repair costs.
How can I diagnose U0735 myself using GeekOBD APP?
Using the GeekOBD APP, you can perform a quick scan to identify the U0735 code, view freeze frame data for context, and run diagnostic tests on the transmission control module. This will help you understand the severity of the issue and whether professional assistance is necessary.
What vehicles are most commonly affected by U0735?
Vehicles like the 2015-2018 Ford F-150, 2016-2019 Chevrolet Silverado, and 2017-2019 GMC Sierra have been known to experience the U0735 code due to their electronic control systems. Always check for any recalls or technical service bulletins related to your specific make and model.
How can I prevent U0735 from happening again?
To prevent U0735, regularly inspect your vehicle's wiring and connectors, keep the software updated, and maintain the transmission system according to manufacturer recommendations. Regular maintenance can help catch any issues early.
What is U0735?
DTC U0735 refers to a communication error within the vehicle's Control Area Network (CAN). This code typically indicates that the transmission control module (TCM) is not receiving or sending data as expected, leading to potential issues in vehicle performance. When this communication fails, it can manifest as erratic shifting, reduced power, or even engine stalling. For vehicle owners, understanding this code is vital as it can severely affect drivability and safety. Commonly seen in popular models like the 2015-2018 Ford F-150, U0735 may also appear in other makes with similar electronic configurations. If left unaddressed, the underlying issues leading to this code can worsen, potentially leading to expensive repairs and safety hazards. In practical terms, if your vehicle's check engine light is illuminated alongside this code, it’s crucial to investigate the problem promptly. Ignoring it could result in further damage to the transmission system or other internal components, leading to costly repairs and a longer downtime for your vehicle.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0735 is present:
- Check engine light stays on constantly, indicating a fault in the transmission control system.
- Engine hesitates during acceleration, making it difficult to maintain speed or power.
- Fuel economy decreased by 10-15%, resulting in more frequent stops at the gas station.
- Erratic shifting may occur, leading to a rough driving experience and potential safety risks.
- Transmission may go into 'limp mode,' restricting speed and performance to protect the vehicle.
Possible Causes
Most common causes of U0735 (ordered by frequency):
- Faulty TCM or wiring issues (50% likelihood) - The transmission control module might be malfunctioning or there may be damaged wiring, leading to communication loss.
- Corroded connectors (30% likelihood) - Corrosion at connection points can interrupt the electrical signals needed for proper operation.
- Software issues (10% likelihood) - Outdated or corrupted software can lead to communication failures within the vehicle's systems.
- Less common but serious cause: A failing engine control module (ECM) that affects multiple systems, including the transmission.
- Rare but possible cause: Issues with the vehicle's ground connections affecting overall electrical performance.
U0735 Repair Costs
Cost Breakdown by Repair Type
Transmission Control Module Replacement
Replacing the faulty TCM if it’s confirmed as the source of the error.
- Total: $800 - $1500
- Success rate: 95%
Wiring Repair or Replacement
Repairing or replacing damaged wiring or connectors that may be causing communication loss.
- Total: $100 - $500
- Success rate: 90%
Money-Saving Tips for U0735
- 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 U0735 Diagnosis Process
Follow these systematic steps to accurately diagnose U0735. 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 (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success (15-20 minutes)
Step 5: Road test verification - Drive 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 a 2016 Ford F-150
Vehicle: 2016 Ford F-150, 75,000 miles
Problem: Customer reported check engine light and sluggish acceleration.
Diagnosis: Found U0735 code during diagnostics; confirmed a faulty TCM after testing.
Solution: Replaced the transmission control module and updated software.
Cost: $1200 (parts: TCM $900, labor $300)
Result: Vehicle returned to normal performance, and check engine light was cleared.
Case Study 2: Wiring Repair on a 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado, 50,000 miles
Problem: Customer complained of erratic shifting and engine light on.
Diagnosis: Diagnosed U0735; found corroded connectors causing communication failure.
Solution: Repaired wiring and cleaned connectors to restore proper communication.
Cost: $250 (parts: wiring $100, labor $150)
Result: Improved shifting, no further issues reported.