Quick Answer
U055E means: U055E indicates a communication error between vehicle control modules.
Can I drive with U055E? Immediate attention is recommended to prevent performance issues.
Common Questions
What does U055E mean and how does it affect my car?
The U055E code indicates a communication error between control modules in your vehicle. This can affect engine performance, transmission operation, and even fuel efficiency. If left unresolved, these issues can escalate, potentially leading to more significant problems and costly repairs.
What are the most common causes of U055E and how much does it cost to fix?
Common causes include faulty wiring (60% likelihood), defective modules, and software issues. Repair costs can range from $150 for wiring repairs to $1,200 for control module replacements. Regular maintenance and inspections can help prevent such issues.
Can I drive my car with U055E or should I stop immediately?
While you may be able to drive with the U055E code, it is not advisable. The code indicates a high-severity issue that can affect vehicle safety and performance. It is best to have the vehicle inspected as soon as possible to prevent further damage.
How can I diagnose U055E myself using GeekOBD APP?
Using the GeekOBD APP, you can connect to your vehicle's OBD2 system. Start by scanning for all trouble codes and freeze frame data, which provides context for the U055E code. Look for any related codes that may help pinpoint the issue.
What vehicles are most commonly affected by U055E?
The U055E code is often reported in 2015-2020 Chevrolet and GMC models, including the Silverado, Sierra, and Equinox. Checking for any recalls or technical service bulletins (TSBs) related to communication errors may also be beneficial.
How can I prevent U055E from happening again?
Regular vehicle maintenance, including checking wiring connections and module performance, can help prevent U055E from recurring. Keeping moisture out of critical components and ensuring software is up to date can also reduce the risk.
What is U055E?
The diagnostic trouble code (DTC) U055E indicates a communication error between the vehicle's control modules, specifically pointing to an issue where one module is unable to communicate properly with another. This code often surfaces in vehicles that have multiple electronic control units (ECUs) that rely on data exchange to function correctly. For example, in many 2015-2020 Chevrolet and GMC models, the engine control module (ECM) may fail to receive signals from the transmission control module (TCM), leading to performance issues. When a U055E code is triggered, it usually signifies that there is a malfunction in the communication bus, which can be due to faulty wiring, defective modules, or even software glitches. Real-world implications of this error can range from minor inconveniences, like the check engine light illuminating, to significant performance problems, such as the vehicle entering limp mode, where engine power is reduced to prevent further damage. Proper diagnosis is crucial, as ignoring the U055E code could lead to more severe issues down the line, including complete loss of communication between critical engine components.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U055E is present:
- Check engine light stays on constantly, indicating a serious issue.
- Engine hesitates during acceleration, affecting driving performance.
- Fuel economy decreased by 10-15%, leading to higher fuel costs.
- Transmission may not shift properly, causing jerky movements.
- Dashboard warning lights may illuminate, indicating multiple system failures.
Possible Causes
Most common causes of U055E (ordered by frequency):
- The most common cause of U055E is a faulty wiring harness, which accounts for about 60% of cases. This can include damaged or corroded connectors that disrupt communication.
- Another cause could be a defective module, such as the ECM or TCM, which can fail due to internal issues or manufacturing defects.
- Software glitches can also trigger this code, often resolved through a simple software update or reprogramming of the affected module.
- Less common but serious causes include water intrusion into the control modules, which can result from leaks or poor seals.
- A rare cause may involve issues with the vehicle’s battery or charging system, leading to insufficient power for module operations.
U055E Repair Costs
Cost Breakdown by Repair Type
Wiring Harness Repair
Repair or replacement of damaged wiring harness.
- Total: $150 - $500
- Success rate: 85%
Control Module Replacement
Replacement of faulty ECM or TCM.
- Total: $600 - $1,200
- Success rate: 90%
Software Update
Reprogramming or updating the software on modules.
- Total: $100 - $300
- Success rate: 70%
Money-Saving Tips for U055E
- 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 U055E Diagnosis Process
Follow these systematic steps to accurately diagnose U055E. 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 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: Repair Case Study: 2017 Chevrolet Silverado
Vehicle: 2017 Chevrolet Silverado 1500, 65,000 miles
Problem: Customer reported engine hesitation and check engine light on.
Diagnosis: After using the GeekOBD APP, U055E was found along with a few other codes indicating communication failures.
Solution: Repaired damaged wiring in the harness connecting the ECM and TCM.
Cost: $350 (including parts and labor)
Result: The vehicle was restored to normal operation, and the customer reported no further issues.
Case Study 2: Repair Case Study: 2018 GMC Terrain
Vehicle: 2018 GMC Terrain, 45,000 miles
Problem: Check engine light illuminated, and the vehicle entered limp mode.
Diagnosis: Diagnostic testing revealed U055E due to a faulty TCM.
Solution: Replaced the transmission control module and updated the software.
Cost: $800 (including parts and labor)
Result: Post-repair, the vehicle operated smoothly without further fault codes.