Quick Answer
U0118 means: U0118 indicates a lost communication with the fuel pump control module, affecting fuel delivery.
Can I drive with U0118? Address this issue immediately to prevent stalling or failure to start.
Common Questions
What does U0118 mean and how does it affect my car?
U0118 indicates a communication failure with the fuel pump control module, which can significantly affect fuel delivery to your engine. If this issue is present, your vehicle may experience stalling, poor acceleration, and even failure to start, which can be dangerous. It's essential to address this issue promptly to maintain vehicle safety and performance.
What are the most common causes of U0118 and how much does it cost to fix?
Common causes of U0118 include a faulty fuel pump control module, damaged wiring, or software issues within the ECU. Repair costs can range from $100 for wiring repairs to $600 for module replacement, depending on the specific issue and vehicle model.
Can I drive my car with U0118 or should I stop immediately?
It's not advisable to drive your car with a U0118 code, as it can lead to stalling or a complete failure to start. If you experience symptoms like hesitation or failure to start, it's best to have your vehicle inspected as soon as possible to avoid being stranded or causing further damage.
How can I diagnose U0118 myself using GeekOBD APP?
Using the GeekOBD APP, start by scanning for trouble codes to confirm U0118. Check the freeze frame data to understand the conditions under which the code was triggered. You can then visually inspect the wiring and connectors, and use the app to clear the code to see if it returns after a test drive.
What vehicles are most commonly affected by U0118?
U0118 is commonly reported in vehicles like the 2013-2018 Ford F-150 and the 2014-2019 Chevrolet Silverado. It's advisable to check for any recalls or technical service bulletins (TSBs) related to fuel system issues in your vehicle model.
How can I prevent U0118 from happening again?
Regular maintenance is key to preventing U0118. Ensure that your vehicle's wiring is checked periodically for wear and tear, and keep the fuel system clean. Using quality fuel and performing timely oil changes can also help maintain engine performance and communication with the fuel pump control module.
What is U0118?
The U0118 diagnostic trouble code indicates a loss of communication with the fuel pump control module. This issue can arise from a variety of factors, including faulty wiring, issues within the fuel pump control module itself, or problems with the engine control unit (ECU). When this code is triggered, it signifies that the vehicle's computer is unable to communicate with the fuel pump module, which can lead to significant issues such as engine stalling or failure to start. In simpler terms, your vehicle might struggle to get the fuel it needs, causing erratic behavior or complete shutdown. This is particularly concerning for drivers who rely on their vehicles daily, as it can lead to unsafe situations on the road. When this code appears, it’s crucial to diagnose the underlying cause promptly to avoid further complications, such as damage to the fuel system or engine components. If ignored, the vehicle may become undriveable, leading to costly repairs down the line.
System: U - Network (Communication, CAN Bus)
Symptoms
Common symptoms when U0118 is present:
- Check engine light illuminates on the dashboard, signaling an issue with the fuel system.
- Engine may hesitate during acceleration, leading to a frustrating driving experience and potential safety hazards.
- Fuel economy decreases significantly, often by 10-20%, as the engine struggles to maintain optimal performance.
- Vehicle may fail to start intermittently, leaving you stranded and in need of immediate assistance.
- Unusual noises coming from the fuel tank area, which could indicate a malfunctioning fuel pump.
Possible Causes
Most common causes of U0118 (ordered by frequency):
- The most common cause of U0118 is a faulty fuel pump control module, which occurs in about 60% of cases. This module is responsible for regulating fuel delivery to the engine.
- A second common cause is damaged wiring or connectors between the ECU and the fuel pump control module, often resulting from wear and tear or exposure to moisture.
- Another cause could be a software issue within the ECU itself, which may require a firmware update or reprogramming to resolve.
- In rare cases, a malfunctioning fuel pump can cause a communication break, leading to this code being triggered.
- Less frequently, a blown fuse in the fuel pump circuit could lead to this code, preventing any communication from occurring at all.
U0118 Repair Costs
Cost Breakdown by Repair Type
Fuel Pump Control Module Replacement
Replacing the faulty fuel pump control module with a new one.
- Total: $200 - $600
- Success rate: 90%
Wiring Repair
Repairing damaged wiring or connectors between the ECU and the fuel pump control module.
- Total: $100 - $300
- Success rate: 80%
ECU Reprogramming
Updating or reprogramming the engine control unit to resolve software issues.
- Total: $100 - $200
- Success rate: 75%
Money-Saving Tips for U0118
- 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 U0118 Diagnosis Process
Follow these systematic steps to accurately diagnose U0118. Each step builds on the previous one to ensure accurate diagnosis.
Step 1: Step 1: Initial visual inspection - Check for signs of damaged wiring, loose connections, or corrosion, which can take about 5-10 minutes
Step 1: Initial visual inspection - Check for signs of damaged wiring, loose connections, or corrosion, which can take about 5-10 minutes.
Step 2: Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data to understand the fault context, taking around 10-15 minutes
Step 2: OBD2 scan with GeekOBD APP - Use the app to retrieve all codes and freeze frame data to understand the fault context, taking around 10-15 minutes.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel pump control module and associated wiring, which can take 20-30 minutes
Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel pump control module and associated wiring, which can take 20-30 minutes.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP, typically around 10-15 minutes
Step 4: System function test - Verify proper operation after repairs and clear codes using the GeekOBD APP, typically around 10-15 minutes.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, which may take 15-20 minutes
Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success, which may take 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 U0118 Communication Issue
Vehicle: 2015 Ford F-150, 60,000 miles
Problem: Customer reported intermittent starting issues and check engine light illumination.
Diagnosis: After scanning for codes, U0118 was identified. A visual inspection revealed damaged wiring to the fuel pump control module.
Solution: Replaced the damaged wiring and the fuel pump control module.
Cost: $450 (parts: $300, labor: $150)
Result: Customer reported improved starting reliability and no further issues with the fuel system.
Case Study 2: Chevrolet Silverado U0118 Diagnostic Challenge
Vehicle: 2017 Chevrolet Silverado, 30,000 miles
Problem: Vehicle hesitated during acceleration and check engine light was on.
Diagnosis: After using the GeekOBD APP, U0118 was confirmed. Further testing indicated a software glitch in the ECU.
Solution: Performed ECU reprogramming to resolve the software issue.
Cost: $150 (software update)
Result: Driving performance restored, and no further codes returned after several weeks.