U18A2 Chevrolet 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 Chevrolet 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 Chevrolet Description
What are the Possible Causes of the DTC U18A2 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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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Information for Specific Chevrolet Models
- U18A2 2014 Chevrolet Silverado — Lost Communication with Fuel Pump Driver Control Module
- U18A2 2015 Chevrolet Silverado — Lost Communication with Fuel Pump Driver Control Module
- U18A2 2016 Chevrolet Silverado — Lost Communication with Fuel Pump Driver Control Module
- U18A2 2017 Chevrolet Silverado — Lost Communication with Fuel Pump Driver Control Module
- U18A2 2018 Chevrolet Silverado — Lost Communication with Fuel Pump Driver Control Module
Frequently Asked Questions about U18A2 Chevrolet Code
1. What are the common symptoms of OBDII code U18A2 in a Chevrolet indicating a lost communication with the Fuel Pump Driver Control Module?
- Common symptoms include engine stalling, difficulty starting the vehicle, and a non-functioning fuel pump.
2. What are the possible causes of the U18A2 code in a Chevrolet related to the Fuel Pump Driver Control Module communication issue?
- Potential causes may include faulty wiring connections, a defective Fuel Pump Driver Control Module, or a problem with the vehicle's computer system.
3. How can I diagnose the U18A2 code in my Chevrolet if I suspect a communication problem with the Fuel Pump Driver Control Module?
- A thorough inspection of the wiring connections, checking for loose or damaged wires, and using a diagnostic scan tool to communicate with the Fuel Pump Driver Control Module can help diagnose the issue.
4. Is it safe to continue driving my Chevrolet with the U18A2 code related to lost communication with the Fuel Pump Driver Control Module?
- It is not advisable to drive the vehicle with this code present, as it may lead to fuel delivery issues and potential engine stalling, posing a safety risk.
5. What are some repair tips for resolving the U18A2 code in a Chevrolet due to a lost communication with the Fuel Pump Driver Control Module?
- Repair tips include checking and repairing any faulty wiring connections, replacing the Fuel Pump Driver Control Module if necessary, and clearing the code with a diagnostic scan tool after making the repairs.
6. Can a DIY enthusiast fix the U18A2 code in a Chevrolet related to the Fuel Pump Driver Control Module communication issue?
- While some basic diagnostic and repair tasks can be performed by a DIY enthusiast, resolving complex issues with the Fuel Pump Driver Control Module may require professional assistance.
7. How much does it typically cost to repair the U18A2 code in a Chevrolet caused by a communication problem with the Fuel Pump Driver Control Module?
- The cost of repair can vary depending on the underlying issue, but it may involve expenses for parts replacement, labor, and diagnostic services, ranging from a few hundred to over a thousand dollars.
8. Can a disconnected or dead battery trigger the U18A2 code in a Chevrolet indicating a lost communication with the Fuel Pump Driver Control Module?
- Yes, a disconnected or dead battery can sometimes cause communication errors between modules in the vehicle, leading to the triggering of codes like U18A2.
9. How long does it typically take to repair the U18A2 code in a Chevrolet related to a lost communication with the Fuel Pump Driver Control Module?
- The repair time can vary based on the specific issue, skill level of the technician, and availability of parts, but it may take a few hours to a full day to diagnose and fix the problem.
10. Are there any preventive measures to avoid encountering the U18A2 code in a Chevrolet due to communication issues with the Fuel Pump Driver Control Module?
- Regularly inspecting and maintaining the vehicle's electrical system, addressing any wiring issues promptly, and following the manufacturer's recommended maintenance schedule can help prevent such codes from occurring.
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