U18A2 2017 Chevrolet Silverado Code - Lost Communication with Fuel Pump Driver Control Module
Quick Answer
The U18A2 diagnostic trouble code (DTC) indicates that there is a loss of communication between the vehicle's Engine Control Module (ECM) and the Fuel Pump Driver Control Module. Common causes include Wiring harness issues such as breaks, shorts, or loose connections, Faulty Fuel Pump Driver Control Module, Malfunctioning Engine Control Module. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- U18A2 2017 Chevrolet Silverado indicates Lost Communication with Fuel Pump Driver Control Module.
- Common causes
- Common causes include Wiring harness issues such as breaks, shorts, or loose connections, Faulty Fuel Pump Driver Control Module, Malfunctioning Engine Control Module.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
Code U18A2 2017 Chevrolet Silverado Description
The U18A2 diagnostic trouble code (DTC) indicates that there is a loss of communication between the vehicle's Engine Control Module (ECM) and the Fuel Pump Driver Control Module. The Fuel Pump Driver Control Module is responsible for controlling the fuel pump's operation, ensuring the correct fuel pressure is maintained for optimal engine performance. When communication is lost between these modules, it can lead to various issues affecting the vehicle's drivability.
Common Causes of U18A2 2017 Chevrolet Silverado
- Wiring harness issues such as breaks, shorts, or loose connections.
- Faulty Fuel Pump Driver Control Module.
- Malfunctioning Engine Control Module.
- Corrosion in the connectors.
- Electrical interference or communication bus errors.
Symptoms of U18A2 2017 Chevrolet Silverado
- Check Engine Light illuminated on the dashboard.
- Engine misfires or hesitates during acceleration.
- Vehicle stalls or struggles to start.
- Reduced fuel efficiency.
- In severe cases, the vehicle may fail to start altogether.
How to Fix U18A2 2017 Chevrolet Silverado
- Begin by conducting a thorough visual inspection of the wiring harness, connectors, and modules for any visible damage or corrosion.
- Use a multimeter to test the continuity of the wiring and ensure proper voltage is reaching the Fuel Pump Driver Control Module.
- If no issues are found with the wiring, proceed to test the Fuel Pump Driver Control Module and Engine Control Module for proper functionality.
- Replace any faulty components as needed, ensuring that all connections are secure and free of corrosion.
- Clear the DTCs from the vehicle's computer memory and perform a test drive to confirm that the issue has been resolved.
Cost to Fix U18A2 2017 Chevrolet Silverado
The cost of repairing a lost communication issue with the Fuel Pump Driver Control Module on a 2017 Chevrolet Silverado can vary depending on the extent of the problem and the specific components that need to be replaced. Typically, the cost can range from $200 to $500 for parts and labor. However, as mentioned earlier, the actual cost may differ based on the location, dealership rates, and the complexity of the repair. It's advisable to consult with a certified mechanic or auto repair shop to get an accurate estimate for your specific situation.
Tech Notes for U18A2 2017 Chevrolet Silverado
- 2014-2018 Chevrolet Silverado
- 2015-2018 Chevrolet Suburban
- 2015-2018 Chevrolet Tahoe
If the Diagnostic Trouble Codes (DTC) P2635, U0074, and/or U18A2 are set, it may be found that the actual fuel pressure (low-pressure system) will be reading substantially higher than desired fuel pressure, in this case, the cause of the problem is a loss of communication between Engine Control Module (ECM) and Fuel Pump Control Module (FPCM).
- Diagnose for any communication DTCs set (U0074 would take priority over U18A2 if both set) before addressing DTC P2635.
- If DTC P2635 is not resolved by correcting the communication DTCs, only then should diagnose the DTC P2635.
- It has been found that a communication issue between the FPCM and ECM can potentially induce DTC P2635 and result in a pressure differential between actual and desired fuel system pressures.
- If the actual fuel pressure is substantially higher than desired (10 psi / 70 kPa or more), replacement of the fuel pump control module or fuel system components typically will not resolve this issue.
- If the actual fuel pressure is substantially lower than desired (10 psi / 70 kPa or more), this Factory Service Bulletin would NOT apply. It would be recommended to diagnose low actual fuel pressure.
Need more information about the U18A2 2017 Chevrolet Silverado code?
Need more information on how to fix the U18A2 2017 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the U18A2 2017 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about U18A2 2017 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code U18A2 in a 2017 Chevrolet Silverado related to "Lost Communication with Fuel Pump Driver Control Module"?
- Common symptoms may include the engine stalling, difficulty starting the vehicle, and issues with fuel delivery.
2. What are the possible causes of OBDII code U18A2 in a 2017 Chevrolet Silverado?
- Possible causes include a faulty fuel pump driver control module, wiring issues, loose connections, or a malfunctioning powertrain control module (PCM).
3. How can I diagnose the root cause of the "Lost Communication with Fuel Pump Driver Control Module" issue in my 2017 Chevrolet Silverado?
- It is recommended to perform a thorough inspection of the wiring harness, connectors, and modules associated with the fuel pump system. Using a diagnostic scanner to retrieve trouble codes can also help pinpoint the problem.
4. What are some repair tips for addressing OBDII code U18A2 in a 2017 Chevrolet Silverado?
- Repair tips may include checking and repairing any damaged wiring, ensuring proper connections, and potentially replacing the fuel pump driver control module if necessary.
5. Can I continue driving my 2017 Chevrolet Silverado with the U18A2 code indicating lost communication with the fuel pump driver control module?
- It is not recommended to continue driving the vehicle with this code present, as it can lead to further fuel system issues and potentially cause safety concerns.
6. Is it possible to reset the OBDII code U18A2 in a 2017 Chevrolet Silverado after addressing the communication issue with the fuel pump driver control module?
- After repairing the underlying issue causing the code, a diagnostic scanner can be used to clear the code and reset the vehicle's system.
7. How much does it typically cost to repair the "Lost Communication with Fuel Pump Driver Control Module" issue in a 2017 Chevrolet Silverado?
- The cost of repair can vary depending on the specific cause of the problem, but it may involve labor costs for diagnosis and repair, as well as potential part replacement expenses.
8. Is the U18A2 code related to the fuel pump driver control module a common issue in 2017 Chevrolet Silverado vehicles?
- While not extremely common, issues with the fuel pump driver control module and communication problems can occur in various vehicle models, including the 2017 Chevrolet Silverado.
9. Can a DIY enthusiast with some automotive knowledge fix the U18A2 code issue in a 2017 Chevrolet Silverado?
- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair the communication issue with the fuel pump driver control module. However, professional help is recommended for complex electrical system repairs.
10. Will fixing the U18A2 code issue improve the overall performance and fuel efficiency of a 2017 Chevrolet Silverado?
- Addressing the communication issue with the fuel pump driver control module can help restore proper fuel delivery and engine performance, potentially leading to improved overall vehicle performance and fuel efficiency.
Discuss the causes and fixes for U18A2 2017 Chevrolet Silverado OBDII Code
Code U18A2 2017 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.