U0108 - Understanding DTC U0108: Common Issues in 2010-2020 Ford F-150 and Chevy Silverado

Quick Answer

U0108 means: DTC U0108 means there is a communication issue between the engine control module and the fuel pump control module.

Fix: Check and replace faulty components Cost: $100 - $300 Time: 90-180 minutes

Can I drive with U0108? Immediate attention is required to avoid further vehicle damage.

Common Questions

What does U0108 mean and how does it affect my car?

U0108 indicates a communication failure between the engine control module and the fuel pump control module, which can lead to engine performance issues or even a no-start condition. Ignoring this code can have long-term effects on your vehicle's performance and safety.

What are the most common causes of U0108 and how much does it cost to fix?

The most common causes include damaged wiring (60% chance) and a faulty fuel pump control module (25% chance), with repair costs ranging from $100 for wiring repairs to $600 for module replacement.

Can I drive my car with U0108 or should I stop immediately?

Driving with U0108 is not advisable as it can lead to engine stalling and result in unsafe driving conditions. It is best to address the issue promptly to avoid further complications.

How can I diagnose U0108 myself using GeekOBD APP?

To diagnose U0108 using the GeekOBD APP, first connect the app to your vehicle's OBD2 port. Use the app to scan for trouble codes and check for any freeze frame data that can help you assess the situation. Look for any related codes that may provide additional context.

What vehicles are most commonly affected by U0108?

Commonly affected vehicles include the 2015-2018 Ford F-150 and 2014-2019 Chevy Silverado. Always check for specific recalls or technical service bulletins (TSBs) related to your vehicle.

How can I prevent U0108 from happening again?

Regular maintenance, including checking wiring and connectors for wear, cleaning electrical connections, and ensuring no moisture infiltration can help prevent U0108. Periodic scans with the GeekOBD APP can also identify issues before they escalate.

What is U0108?

DTC U0108 indicates a loss of communication with the fuel pump control module. This code appears when the engine control module (ECM) cannot communicate with the fuel pump control module, which is crucial for the proper functioning of your vehicle’s fuel system. The fuel pump control module regulates the fuel pump's operation based on various sensor inputs. When this communication is lost, it can lead to several issues, including engine stalling, poor fuel economy, and difficulty starting the vehicle. For car owners, encountering this code can be alarming, especially if you're unsure about its implications. It can result in a no-start condition in some cases, which means you might find your vehicle unresponsive when you turn the key. Common in vehicles like the 2015-2018 Ford F-150 and 2014-2019 Chevy Silverado, U0108 can stem from issues such as damaged wiring, faulty connectors, or even a failed fuel pump control module itself. Ignoring this code could lead to more severe problems, including engine damage, so it's essential to address it promptly. Always consult your vehicle’s service manual for specific troubleshooting steps related to your make and model.

System: U - Network (Communication, CAN Bus)

Symptoms

Common symptoms when U0108 is present:

  • Check engine light stays on constantly, indicating an ongoing issue with the fuel pump system.
  • Engine hesitates during acceleration, which can be unsafe in traffic and may lead to a stall.
  • Fuel economy decreased by 10-15%, leading to higher fuel expenses and reduced efficiency.
  • Difficulty starting the engine, which can leave you stranded if not addressed promptly.
  • Engine stalling while driving, posing a significant safety risk and potential for accidents.

Possible Causes

Most common causes of U0108 (ordered by frequency):

  1. Damaged wiring or loose connections (60% likelihood) - This is the most common cause of U0108, often due to wear and tear or environmental factors.
  2. Faulty fuel pump control module (25% likelihood) - If the module fails, it cannot send or receive signals from the ECM.
  3. Corrosion at electrical connectors (10% likelihood) - Moisture can lead to corrosion, interrupting communication.
  4. Faulty engine control module (3% likelihood) - Though rare, a malfunctioning ECM can also be the source of this issue.
  5. Aftermarket modifications (2% likelihood) - Changes made to the vehicle's electrical system can disrupt communication between modules.

U0108 Repair Costs

Cost Breakdown by Repair Type

Wiring Repair

Repairing damaged or corroded wiring and connectors related to the fuel pump module.

  • Total: $100 - $300
  • Success rate: 85%
Fuel Pump Control Module Replacement

Replacing the faulty fuel pump control module with a new OEM or aftermarket part.

  • Total: $200 - $600
  • Success rate: 90%
ECM Replacement

In rare cases, replacing the engine control module if found defective.

  • Total: $500 - $1,500
  • Success rate: 70%
Money-Saving Tips for U0108
  • 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 U0108 Diagnosis Process

Follow these systematic steps to accurately diagnose U0108. 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).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
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).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 3: Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel pump control module and associated wiring (20-30 minutes)

Step 3: Component testing - Use a multimeter or specific diagnostic tools to test the fuel pump control module and associated wiring (20-30 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 4: Step 4: System function test - Verify proper operation after repairs and clear codes, ensuring the issue is resolved (10-15 minutes)

Step 4: System function test - Verify proper operation after repairs and clear codes, ensuring the issue is resolved (10-15 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.
Step 5: Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for recurring issues (15-20 minutes)

Step 5: Road test verification - Drive the vehicle under various conditions to confirm repair success and check for recurring issues (15-20 minutes).

GeekOBD APP Tip: Use GeekOBD APP to monitor real-time data during this diagnostic step for accurate results and professional-grade analysis.

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 Ford F-150

Vehicle: 2017 Ford F-150, 50,000 miles

Problem: Customer reported the engine hesitated during acceleration and the check engine light was on.

Diagnosis: After scanning with the GeekOBD APP, DTC U0108 was confirmed. A visual inspection revealed damaged wiring leading to the fuel pump control module.

Solution: Repaired the wiring and cleared the DTC. No further issues were observed post-repair.

Cost: $150 (repair and part replacement)

Result: Customer reported improved performance with no further hesitation.

Case Study 2: Repair Case Study: 2016 Chevy Silverado

Vehicle: 2016 Chevy Silverado, 70,000 miles

Problem: Owner experienced difficulty starting the vehicle and frequent stalling.

Diagnosis: The GeekOBD APP indicated U0108. Further testing confirmed a faulty fuel pump control module.

Solution: Replaced the fuel pump control module and performed a system function test.

Cost: $450 (module replacement and labor)

Result: Vehicle started reliably afterward, with no stalling or hesitation.

Diagnose U0108

Use GeekOBD APP for professional diagnosis!

  • Real-time data monitoring
  • Advanced diagnostic features
  • Step-by-step repair guidance
  • Professional-grade analysis
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Code Information

Code: U0108
System: Network (Communication, CAN Bus)
Severity: HIGH
Category: Network Codes