U18A2 2018 Chevrolet Silverado Code - Lost Communication with Fuel Pump Driver Control Module
Quick Answer
Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module circuit poor electrical connection. 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 2018 Chevrolet Silverado indicates Lost Communication with Fuel Pump Driver Control Module.
- Common causes
- Common causes include Faulty Fuel Pump Driver Control Module, Fuel Pump Driver Control Module harness is open or shorted, Fuel Pump Driver Control Module circuit poor electrical connection.
- 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.
Code U18A2 2018 Chevrolet Silverado Description
What are the Possible Causes of the DTC U18A2 2018 Chevrolet Silverado?
- Faulty Fuel Pump Driver Control Module
- Fuel Pump Driver Control Module harness is open or shorted
- Fuel Pump Driver Control Module circuit poor electrical connection
How to Fix the DTC U18A2 2018 Chevrolet Silverado?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
Code Tech Notes
- 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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the U18A2 2018 Chevrolet Silverado code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Frequently Asked Questions about U18A2 2018 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code U18A2 in a 2018 Chevrolet Silverado related to lost communication with the Fuel Pump Driver Control Module?
- Common symptoms include issues with starting the vehicle, loss of power during operation, and potential stalling.
2. What are some possible causes of the U18A2 code indicating lost communication with the Fuel Pump Driver Control Module in a 2018 Chevrolet Silverado?
- Potential causes may include a faulty Fuel Pump Driver Control Module, damaged wiring or connectors, software glitches, or a malfunctioning powertrain control module (PCM).
3. How can I diagnose the U18A2 trouble code in my 2018 Chevrolet Silverado related to communication issues with the Fuel Pump Driver Control Module?
- Diagnosing the code typically involves using a diagnostic scanner to retrieve the specific trouble codes, checking the wiring for any visible damage, and testing the Fuel Pump Driver Control Module for functionality.
4. What are some tips for repairing the U18A2 code indicating lost communication with the Fuel Pump Driver Control Module in a 2018 Chevrolet Silverado?
- Repair tips may include repairing or replacing damaged wiring, ensuring connectors are securely attached, updating software if necessary, and replacing the Fuel Pump Driver Control Module if it is faulty.
5. Can a DIY enthusiast fix the U18A2 code related to lost communication with the Fuel Pump Driver Control Module in a 2018 Chevrolet Silverado?
- While some basic troubleshooting steps can be done by a DIY enthusiast, diagnosing and repairing communication issues with the Fuel Pump Driver Control Module may require advanced tools and expertise, so it's recommended to consult a professional mechanic.
6. Is it safe to continue driving my 2018 Chevrolet Silverado with the U18A2 trouble code indicating communication problems with the Fuel Pump Driver Control Module?
- It is not advisable to continue driving the vehicle with unresolved communication issues related to the Fuel Pump Driver Control Module, as it can lead to potential safety hazards and further damage to the vehicle.
7. How much does it typically cost to repair the U18A2 code signifying lost communication with the Fuel Pump Driver Control Module in a 2018 Chevrolet Silverado?
- The cost of repairs can vary depending on the specific issue causing the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.
8. Are there any recalls or technical service bulletins (TSBs) related to the U18A2 code in a 2018 Chevrolet Silverado for lost communication with the Fuel Pump Driver Control Module?
- It is recommended to check with authorized Chevrolet dealerships or online resources for any recalls or TSBs related to the U18A2 code in the 2018 Chevrolet Silverado to see if there are known issues or solutions provided by the manufacturer.
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