Quick Answer
U0990 means: DTC U0990 indicates a communication failure between vehicle control modules, possibly affecting performance and systems.
Can I drive with U0990? Immediate attention recommended to prevent further complications.
Common Questions
What does U0990 mean and how does it affect my car?
DTC U0990 indicates a communication issue between vehicle control modules, which can impact systems like ABS and engine management. If this code is present, you might notice performance issues, such as engine stalling or malfunctioning safety features.
What are the most common causes of U0990 and how much does it cost to fix?
Common causes of U0990 include faulty wiring (40% likelihood), malfunctioning control modules, and poor ground connections. Repair costs can range from $100 for wiring repairs to $800 for control module replacements.
Can I drive my car with U0990 or should I stop immediately?
While driving with DTC U0990 isn't immediately dangerous, it is advisable to address the issue quickly to avoid further complications. Ignoring the code could lead to more significant problems down the line.
How can I diagnose U0990 myself using GeekOBD APP?
To diagnose U0990 with the GeekOBD APP, connect the device and scan for codes. Review freeze frame data to understand when the issue occurs and check for pending codes that might indicate intermittent problems.
What vehicles are most commonly affected by U0990?
U0990 is frequently observed in 2015-2020 Ford F-150 models and some Honda vehicles. Owners should check for any recalls related to their specific model to identify potential fixes.
How can I prevent U0990 from happening again?
To prevent U0990, regularly inspect wiring and connectors, ensure software is updated, and maintain optimal battery health to support module communication.
What is U0990?
DTC U0990 is a diagnostic trouble code that indicates a communication error between vehicle control modules. When this code appears, it usually signifies that one of the modules on the vehicle's network is not responding or is unavailable. This can lead to various issues, including malfunctioning systems that rely on these modules for proper operation. For instance, if your Ford F-150 displays this code, you might experience problems with features like the anti-lock braking system (ABS) or even engine performance. The root of this problem often lies in faulty wiring, a bad module, or software issues. Real-world implications include reduced functionality of safety systems, potential engine performance issues, and the inability to complete necessary diagnostic tests. If not addressed, the communication error can lead to further complications in vehicle management systems. Owners should consider that while this code may not present an immediate safety risk, ignoring it can lead to more severe problems down the line.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0990 is present:
- Check engine light remains on, indicating a communication issue within the vehicle's systems.
- Loss of functionality in features such as cruise control or traction control, leading to driver frustration.
- Intermittent engine stalling or hesitation during acceleration, making it difficult to maintain speed or respond to throttle input.
- Increased fuel consumption, which can be quantified as a 10-15% drop in fuel economy due to inefficient engine management.
- Unresponsive dashboard indicators or warning lights, which may not accurately reflect the vehicle's operating status.
Possible Causes
Most common causes of U0990 (ordered by frequency):
- Faulty or disconnected wiring harness, which is the most common cause (approximately 40%). Regular inspection can prevent this issue.
- Malfunctioning control module that may be due to software corruption or physical damage; these typically require replacement or reprogramming.
- Poor ground connections affecting module communication; ensuring proper grounding can help prevent this problem.
- Less common cause includes a failed CAN bus, which facilitates communication between modules; this may require extensive diagnostics to identify.
- Rarely, a power supply issue affecting multiple modules can trigger this code; checking battery voltage and connections is essential.
U0990 Repair Costs
Cost Breakdown by Repair Type
Wiring Repair/Replacement
Repairing or replacing damaged wiring harnesses and connectors.
- Total: $100 - $300
- Success rate: 90%
Control Module Replacement
Replacing a faulty control module that is not responding.
- Total: $200 - $800
- Success rate: 85%
Software Reprogramming
Updating or reprogramming the software on the control module.
- Total: $50 - $150
- Success rate: 75%
Money-Saving Tips for U0990
- 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 U0990 Diagnosis Process
Follow these systematic steps to accurately diagnose U0990. 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, focusing on wiring and connectors (20-30 minutes)
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test suspected components, focusing on wiring and connectors (20-30 minutes).
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes)
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP (10-15 minutes).
Step 5: Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and monitor for any returning codes (15-20 minutes)
Step 5: Road test verification - Drive vehicle under various conditions to confirm repair success and monitor for any returning codes (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 U0990 Repair Case
Vehicle: 2018 Ford F-150, 45,000 miles
Problem: Customer reported check engine light and cruise control failure.
Diagnosis: After scanning with GeekOBD APP, DTC U0990 was confirmed. A visual inspection revealed a damaged wiring harness.
Solution: Replaced the damaged wiring harness and cleared the codes.
Cost: $250 (parts: $150 for the harness, $100 for labor)
Result: Customer's vehicle functions returned to normal, with no reoccurring codes.
Case Study 2: Honda CR-V U0990 Diagnosis
Vehicle: 2017 Honda CR-V, 30,000 miles
Problem: Dashboard warning lights illuminated; vehicle experienced stalling.
Diagnosis: DTC U0990 was retrieved via GeekOBD APP; further testing showed a faulty control module.
Solution: Replaced the control module and updated software.
Cost: $600 (parts: $500 for the module, $100 for labor)
Result: Vehicle performance improved significantly; no issues reported post-repair.