Quick Answer
U085E means: DTC U085E signifies a communication error between vehicle modules, often affecting engine and transmission performance.
Can I drive with U085E? Immediate attention is advised to prevent further damage to the vehicle’s electronic systems.
Common Questions
What does U085E mean and how does it affect my car?
DTC U085E indicates a communication breakdown between your vehicle's control modules. This can affect critical systems like engine management and transmission control, potentially leading to performance issues and safety risks.
What are the most common causes of U085E and how much does it cost to fix?
Common causes include faulty wiring (60% of cases), defective control modules, and software glitches. Repair costs can range from $100 for software updates to $600 for control module replacements.
Can I drive my car with U085E or should I stop immediately?
While you may be able to drive short distances, it’s best to avoid heavy traffic or long trips until the issue is resolved, as it can lead to stalling or other serious problems.
How can I diagnose U085E myself using GeekOBD APP?
Using the GeekOBD APP, you can scan for DTCs, view freeze frame data, and monitor real-time data from the vehicle’s sensors to identify potential issues contributing to U085E.
What vehicles are most commonly affected by U085E?
DTC U085E is frequently reported in 2015-2019 Chevrolet and GMC models such as the Silverado and Sierra. Check for any recalls or technical service bulletins related to your vehicle.
How can I prevent U085E from happening again?
Regularly inspect and maintain your vehicle’s electrical systems, avoid aftermarket modifications that may interfere with the vehicle’s network, and keep connections clean and secure.
What is U085E?
DTC U085E indicates a communication issue between the vehicle's control modules, specifically related to the vehicle's network. This diagnostic trouble code is prevalent in various General Motors vehicles, especially between the years 2015 and 2019, including models like the Chevrolet Silverado and GMC Sierra. When your vehicle's computer system detects that it cannot establish communication with the Powertrain Control Module (PCM) or other critical modules, it triggers this error code. This can happen due to faulty wiring, loose connections, or a failed module. Real-world implications of U085E can lead to issues such as reduced engine performance, erratic transmission behavior, and even complete vehicle stalling in severe cases. Owners may notice symptoms like the check engine light illuminating continuously or performance issues while driving. Ignoring this code can lead to more significant electrical problems, potentially requiring costly repairs or replacements down the road. It’s essential to address this code immediately to ensure your vehicle operates efficiently and safely.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U085E is present:
- Check engine light stays on constantly, indicating a persistent communication error.
- Engine performance issues such as hesitations or stalling during acceleration, causing a lack of power when merging or climbing hills.
- Transmission problems, which may include hard shifting or erratic behavior, making it difficult to drive smoothly.
- Increased fuel consumption, which can lead to a noticeable drop in miles per gallon (MPG) as the vehicle struggles to operate efficiently.
- Malfunctioning dashboard indicators, such as inaccurate speed readings or warning lights that flicker unexpectedly.
Possible Causes
Most common causes of U085E (ordered by frequency):
- Faulty wiring or connectors, accounting for approximately 60% of cases. Corrosion or damage can disrupt the signal between modules.
- A defective control module, which is less common but can happen, especially after severe electrical issues or accidents.
- Software glitches in the vehicle's control systems that may lead to communication failures, often resolved with a software update.
- Aftermarket modifications or repairs that inadvertently interfere with the vehicle's communication network.
- Rarely, environmental factors such as water intrusion into the wiring harness, leading to short circuits.
U085E Repair Costs
Cost Breakdown by Repair Type
Wiring Repair
Repair or replace faulty wiring and connectors associated with communication lines.
- Total: $150 - $300
- Success rate: 85%
Control Module Replacement
Replace defective control modules that are unable to communicate properly.
- Total: $300 - $600
- Success rate: 90%
Software Update
Perform a software update to fix any glitches in the vehicle’s control systems.
- Total: $100 - $200
- Success rate: 75%
Money-Saving Tips for U085E
- 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 U085E Diagnosis Process
Follow these systematic steps to accurately diagnose U085E. 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: Chevrolet Silverado U085E Repair
Vehicle: 2017 Chevrolet Silverado 1500, 80,000 miles
Problem: Customer reported engine hesitation and check engine light on.
Diagnosis: An OBD2 scan revealed code U085E and subsequent visual inspection found corroded connectors.
Solution: Replaced damaged connectors and repaired wiring harness.
Cost: $250 (includes parts and labor)
Result: Vehicle performance restored, and check engine light cleared.
Case Study 2: GMC Sierra Control Module Replacement
Vehicle: 2019 GMC Sierra 1500, 30,000 miles
Problem: Customer experienced frequent stalling and transmission issues.
Diagnosis: OBD2 scan confirmed U085E; testing showed a faulty control module.
Solution: Replaced the control module and updated the software.
Cost: $550 (includes parts and labor)
Result: Stalling issues resolved, and vehicle operates smoothly.