U18A2 2016 GMC Sierra Code - Lost Communication with Fuel Pump Driver Control Module
Quick Answer
The U18A2 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there has been a loss of communication with the Fuel Pump Driver Control Module. Common causes include Faulty Fuel Pump Driver Control Module, Wiring or connection issues, Power supply problems. 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 2016 GMC Sierra indicates Lost Communication with Fuel Pump Driver Control Module.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module, Wiring or connection issues, Power supply problems.
- 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.
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Code U18A2 2016 GMC Sierra Description
The U18A2 diagnostic trouble code (DTC) for a 2016 GMC Sierra indicates that there has been a loss of communication with the Fuel Pump Driver Control Module. This module is responsible for controlling the fuel pump's operation, ensuring that the correct amount of fuel is delivered to the engine for optimal performance. When communication with this module is lost, it can lead to various issues with the vehicle's fuel system.
Common Causes of U18A2 2016 GMC Sierra
- Faulty Fuel Pump Driver Control Module
- Wiring or connection issues
- Power supply problems
- Faulty electronic control unit (ECU)
- Corrosion or damage to electrical connections
Symptoms of U18A2 2016 GMC Sierra
- Engine stalling or hesitation
- Difficulty starting the vehicle
- Engine misfires
- Fuel pump running continuously
- Fuel pump not operating at all
How to Fix U18A2 2016 GMC Sierra
- Perform a thorough inspection of the wiring and connections between the Fuel Pump Driver Control Module and the ECU.
- Test the power supply to the module to ensure it is functioning correctly.
- Check for any corrosion or damage to electrical connections and repair or replace as needed.
- If the module is found to be faulty, replace it with a new one.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix U18A2 2016 GMC Sierra
The typical repair costs for addressing a U18A2 code can vary depending on the specific cause of the communication loss and the cost of parts and labor. In general, the cost of replacing a Fuel Pump Driver Control Module can range from $200 to $500, including parts and labor. Additional costs may be incurred for diagnostic testing and any necessary repairs to wiring or connections. It is advisable to consult with a qualified mechanic or auto repair shop for a more accurate estimate based on the specific circumstances of the vehicle. Labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer lower rates.
Tech Notes for U18A2 2016 GMC Sierra
- 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.
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Frequently Asked Questions about U18A2 2016 GMC Sierra Code
1. What does the OBDII code U18A2 for a 2016 GMC Sierra mean?
- The code U18A2 indicates a "Lost Communication with Fuel Pump Driver Control Module" error in the vehicle's onboard diagnostics system.
2. What are the common symptoms of a U18A2 code in a 2016 GMC Sierra?
- Common symptoms may include the vehicle stalling, rough idling, difficulty starting, or the fuel pump not functioning properly.
3. What are the possible causes of a U18A2 code in a 2016 GMC Sierra?
- The code U18A2 can be triggered by issues such as a faulty fuel pump driver control module, damaged wiring or connectors, a blown fuse, or a communication network problem.
4. How can I diagnose a U18A2 code in my 2016 GMC Sierra?
- Diagnosing a U18A2 code typically involves checking the fuel pump driver control module, inspecting the wiring and connectors for any damage, and verifying that the communication network is functioning correctly.
5. Can a U18A2 code in a 2016 GMC Sierra be fixed by resetting the system?
- Resetting the system may temporarily clear the code, but it is essential to address the underlying issue causing the communication error with the fuel pump driver control module.
6. What are some repair tips for resolving a U18A2 code in a 2016 GMC Sierra?
- Repair tips may include checking and repairing any damaged wiring, replacing the fuel pump driver control module if necessary, ensuring all connections are secure, and conducting a thorough inspection of the fuel pump system.
7. Is it safe to continue driving with a U18A2 code in a 2016 GMC Sierra?
- It is not recommended to drive the vehicle with a U18A2 code present, as it can lead to potential fuel pump failure and other related issues that may affect the vehicle's performance and safety.
8. Can a DIY enthusiast fix a U18A2 code in a 2016 GMC Sierra, or is professional help necessary?
- The complexity of the repair may vary depending on the underlying cause of the U18A2 code. While some DIY enthusiasts may be able to address certain issues like checking and repairing wiring, professional help may be needed for more complex repairs involving the fuel pump driver control module.
9. How much does it typically cost to repair a U18A2 code in a 2016 GMC Sierra at a dealership or auto shop?
- The cost of repairing a U18A2 code can vary depending on the specific issue, parts needed, labor costs, and whether the repair is done at a dealership or an independent auto shop. It is advisable to obtain quotes from different service providers.
10. Are there any preventive measures to avoid encountering a U18A2 code in a 2016 GMC Sierra in the future?
- Regular maintenance, such as checking the fuel pump system, inspecting wiring for damage, and ensuring proper electrical connections, can help prevent issues leading to a U18A2 code in the future.
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