U18A2 2017 GMC Sierra Code - Lost Communication with Fuel Pump Driver Control Module
Quick Answer
The U18A2 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Fuel Pump Driver Control Module. Common causes include Faulty wiring or connectors leading to the Fuel Pump Driver Control Module, A malfunctioning Fuel Pump Driver Control Module, Issues with the vehicle's network communication system, such as the CAN bus. 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 GMC Sierra indicates Lost Communication with Fuel Pump Driver Control Module.
- Common causes
- Common causes include Faulty wiring or connectors leading to the Fuel Pump Driver Control Module, A malfunctioning Fuel Pump Driver Control Module, Issues with the vehicle's network communication system, such as the CAN bus.
- 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 2017 GMC Sierra Description
The U18A2 diagnostic trouble code (DTC) for a 2017 GMC Sierra indicates that there is a communication issue with the Fuel Pump Driver Control Module. This module is responsible for controlling the fuel pump's operation, ensuring the correct fuel pressure is maintained for the engine's performance. When communication is lost with this module, it can lead to various issues affecting the vehicle's drivability.
Common Causes of U18A2 2017 GMC Sierra
- Faulty wiring or connectors leading to the Fuel Pump Driver Control Module.
- A malfunctioning Fuel Pump Driver Control Module.
- Issues with the vehicle's network communication system, such as the CAN bus.
- Corrosion or damage to the electrical connections related to the fuel pump.
- Water intrusion or physical damage to the module or wiring.
Symptoms of U18A2 2017 GMC Sierra
- Engine stalling or hesitation during acceleration.
- Difficulty starting the engine or a no-start condition.
- Reduced fuel efficiency.
- Illumination of the check engine light on the dashboard.
- Rough idling or engine misfires.
How to Fix U18A2 2017 GMC Sierra
- Begin by conducting a visual inspection of the wiring and connectors related to the Fuel Pump Driver Control Module. Look for any signs of damage, corrosion, or loose connections.
- Use a diagnostic scan tool to retrieve the trouble codes and further investigate the communication issue with the module.
- Test the Fuel Pump Driver Control Module for proper operation and communication with the vehicle's computer system.
- If necessary, replace the faulty module or repair any damaged wiring or connectors.
- Clear the DTCs from the vehicle's computer system and perform a test drive to ensure the issue has been resolved.
Cost to Fix U18A2 2017 GMC Sierra
The typical repair costs for addressing a U18A2 code on a 2017 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty Fuel Pump Driver Control Module can range from $200 to $500, including parts and labor. However, if the problem is related to wiring or connectors, the cost may be lower. It's important to note that diagnosis time and labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. For a more accurate estimate, it's recommended to consult with a local auto repair shop.
Tech Notes for U18A2 2017 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 2017 GMC Sierra Code
1. What are common symptoms of OBDII code U18A2 in a 2017 GMC Sierra related to lost communication with the Fuel Pump Driver Control Module?
- Common symptoms include issues starting the vehicle, engine stalling, and fuel pump malfunctions.
2. What are possible causes of OBDII code U18A2 in a 2017 GMC Sierra indicating lost communication with the Fuel Pump Driver Control Module?
- Possible causes may include a faulty fuel pump driver control module, damaged wiring or connectors, or a communication network problem.
3. How can I diagnose the OBDII code U18A2 in a 2017 GMC Sierra to determine the exact cause of lost communication with the Fuel Pump Driver Control Module?
- Diagnosis typically involves using a scan tool to check for additional trouble codes, inspecting the wiring and connectors for damage, and testing the fuel pump driver control module.
4. Is it safe to continue driving a 2017 GMC Sierra with the OBDII code U18A2 indicating lost communication with the Fuel Pump Driver Control Module?
- It is not recommended to continue driving the vehicle as it may lead to potential fuel system issues and engine performance problems.
5. Can I reset the OBDII code U18A2 in a 2017 GMC Sierra related to lost communication with the Fuel Pump Driver Control Module without fixing the underlying issue?
- While you can clear the code temporarily, it is essential to address the root cause to prevent further complications and ensure the proper functioning of the fuel pump system.
6. Are there any DIY repair tips for resolving OBDII code U18A2 in a 2017 GMC Sierra due to lost communication with the Fuel Pump Driver Control Module?
- DIY repair tips may include checking and repairing any damaged wiring or connectors, ensuring proper grounds, and consulting the vehicle's service manual for specific troubleshooting steps.
7. How much does it typically cost to repair OBDII code U18A2 in a 2017 GMC Sierra associated with lost communication with the Fuel Pump Driver Control Module?
- The repair cost can vary depending on the exact cause of the issue, but it may involve replacing the fuel pump driver control module, repairing wiring, or addressing communication network problems.
8. Can extreme weather conditions or environmental factors trigger the OBDII code U18A2 in a 2017 GMC Sierra related to lost communication with the Fuel Pump Driver Control Module?
- Yes, extreme temperatures or moisture exposure can sometimes contribute to electrical issues leading to communication failures with the Fuel Pump Driver Control Module.
9. Is the OBDII code U18A2 specific to 2017 GMC Sierra models with regards to lost communication with the Fuel Pump Driver Control Module?
- While the specific code may vary between vehicle makes and models, the underlying issue of lost communication with the Fuel Pump Driver Control Module is a common problem in many vehicles.
10. How urgent is it to address the OBDII code U18A2 in a 2017 GMC Sierra indicating lost communication with the Fuel Pump Driver Control Module?
- It is recommended to address the issue promptly to prevent potential fuel system failures, engine performance issues, and further damage to the vehicle.
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