Quick Answer
U0905 means: U0905 indicates a communication error between control modules in your vehicle.
Can I drive with U0905? It is advised to address this issue immediately to prevent further complications.
Common Questions
What does U0905 mean and how does it affect my car?
U0905 signifies a communication error between your vehicle's control modules, which can lead to performance issues such as engine stalls or erratic shifting. It's crucial to address this code as it can affect the overall functionality and safety of your vehicle.
What are the most common causes of U0905 and how much does it cost to fix?
The leading cause of U0905 is damaged wiring, followed by corroded connectors. Repair costs can range from $50 to $700 depending on the required work. For example, simple connector cleaning might cost around $50, while replacing a control module could be upwards of $700.
Can I drive my car with U0905 or should I stop immediately?
Driving with U0905 is not recommended. The communication failure can lead to unpredictable vehicle behavior, which poses safety risks. It's best to have your vehicle diagnosed and repaired as soon as possible.
How can I diagnose U0905 myself using GeekOBD APP?
To diagnose U0905 using the GeekOBD APP, connect the OBD2 scanner to your vehicle's port, run a full system scan, and check for any additional codes. Look for freeze frame data that can provide context for when the issue occurs, which will help pinpoint the problem.
What vehicles are most commonly affected by U0905?
U0905 is frequently found in vehicles such as the 2015-2018 Ford F-150, 2014-2017 Chevrolet Silverado, and other models from manufacturers that utilize similar CAN bus setups. Always check for any recalls or TSBs related to your specific model.
How can I prevent U0905 from happening again?
Regular maintenance is key to preventing U0905. Ensure your vehicle's electrical system is inspected periodically, and keep connectors clean and sealed to prevent corrosion. Using quality aftermarket parts can also help maintain proper communication.
What is U0905?
The U0905 diagnostic trouble code (DTC) indicates a communication error between the vehicle's control modules, specifically related to the CAN (Controller Area Network) bus. This code suggests that the vehicle’s onboard computer has detected a malfunction in the communication line that connects various modules, such as the Engine Control Module (ECM), Transmission Control Module (TCM), and other critical systems. When U0905 is triggered, it can lead to a series of performance issues, where affected systems may not function correctly due to the loss of data exchange. This could manifest as erratic behavior in the vehicle, including unexpected engine performance, issues with the transmission shifting, or even the ABS (Anti-lock Braking System) malfunctioning. Commonly found in vehicles like the 2015-2018 Ford F-150 and Chevrolet Silverado, U0905 often results from damaged wiring, corroded connectors, or even software issues within the modules. Car owners should take this code seriously, as ignoring it could lead to more significant problems down the line, including costly repairs and potential safety hazards. Addressing this issue promptly can ensure your vehicle remains reliable and safe on the road.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0905 is present:
- Check engine light remains illuminated, indicating a persistent issue requiring attention.
- Engine performance is inconsistent, leading to unexpected stalls or difficulty starting.
- Transmission may experience harsh shifting or delays in engagement, affecting drivability.
- Dashboard warning lights for various systems may illuminate due to module communication failure.
- Fuel efficiency may decline significantly, potentially by 10-20%, due to engine management issues.
Possible Causes
Most common causes of U0905 (ordered by frequency):
- Damaged wiring harness (60% likelihood) - Over time, wiring can wear out, especially in high-movement areas, leading to shorts or opens.
- Corroded connectors (25% likelihood) - Moisture exposure can cause rust and corrosion, disrupting electrical connections.
- Software glitches (10% likelihood) - Occasionally, a software update may be required to resolve communication issues between modules.
- Failing control module (3% likelihood) - A malfunctioning ECM or TCM can fail to communicate properly with other systems.
- Rare: Intermittent electrical issues (2% likelihood) - Issues that arise under specific conditions, such as temperature changes.
U0905 Repair Costs
Cost Breakdown by Repair Type
Wiring repair or replacement
Repairing damaged wiring or replacing sections of the harness.
- Total: $150 - $400
- Success rate: 85%
Connector cleaning and resealing
Cleaning corroded connectors and resealing them to prevent moisture ingress.
- Total: $50 - $150
- Success rate: 75%
Control module replacement
Replacing a faulty control module that fails to communicate.
- Total: $300 - $700
- Success rate: 90%
Money-Saving Tips for U0905
- 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 U0905 Diagnosis Process
Follow these systematic steps to accurately diagnose U0905. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1
Step 1: Initial visual inspection - Check for obvious signs like damaged wiring, loose connections, or corrosion (5-10 minutes)
Step 2: 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 3: Step 3
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components (20-30 minutes)
Step 4: Step 4
Step 4: System function test - Verify proper operation after repairs and clear codes (10-15 minutes)
Step 5: Step 5
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: Ford F-150 U0905 Communication Error
Vehicle: 2016 Ford F-150, 75,000 miles
Problem: Customer reported intermittent transmission shifting issues and check engine light.
Diagnosis: Using the GeekOBD APP, we confirmed U0905 and checked wiring under the vehicle. Found a damaged harness.
Solution: Repaired the damaged wiring and cleaned connectors.
Cost: $350 (parts and labor)
Result: Transmission shifted smoothly post-repair, and the check engine light stayed off.
Case Study 2: Chevrolet Silverado U0905 Code Diagnosis
Vehicle: 2017 Chevrolet Silverado, 50,000 miles
Problem: Owner experienced erratic engine performance and dashboard warning lights.
Diagnosis: Scanned codes with GeekOBD and found U0905 along with several related codes. Conducted a visual inspection.
Solution: Replaced corroded connectors and updated the ECM software.
Cost: $250 (connector replacement and programming)
Result: The vehicle ran smoothly after repairs, with improved engine performance.