AutoCodes – Chevrolet – U18A2 2016 Chevrolet Silverado

U18A2 2016 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 2016 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.

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Code Popularity 566

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Apr 14, 2023

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U18A2 2016 Chevrolet Silverado Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set a supervised periodic message that includes the transmitter device availability that has not been received.

OBDII Code U18A2 2016 Chevrolet Silverado - Lost Communication with Fuel Pump Driver Control Module - AutoCodes.com — U18A2 2016 Chevrolet Silverado Code - Lost Communication with Fuel Pump Driver Control Module

What does this mean?

What are the Possible Causes of the DTC U18A2 2016 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 2016 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.

What does this mean?

Code Tech Notes

There is a Factory Service Bulletin for the following Chevrolet Models:

- 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 2016 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.

Need more information about the U18A2 2016 Chevrolet Silverado code?

Need more information on how to fix the U18A2 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about U18A2 2016 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code U18A2 in a 2016 Chevrolet Silverado?

- Common symptoms include issues with the fuel pump operation, engine stalling, difficulty starting the vehicle, and the illumination of the check engine light.

2. What does the OBDII code U18A2 indicating "Lost Communication with Fuel Pump Driver Control Module" mean in a 2016 Chevrolet Silverado?

- This code indicates a communication problem between the vehicle's engine control module and the fuel pump driver control module, which can impact the fuel pump's functionality.

3. What are the possible causes of the U18A2 code in a 2016 Chevrolet Silverado?

- The code U18A2 can be triggered by issues such as faulty wiring connections, damaged wiring harnesses, a defective fuel pump driver control module, or a malfunctioning engine control module.

4. How can I diagnose the U18A2 code in my 2016 Chevrolet Silverado?

- Diagnosing the U18A2 code typically involves using a diagnostic scanner to retrieve the code, checking the wiring connections related to the fuel pump driver control module, and testing the modules for proper functionality.

5. What are the repair options for resolving the U18A2 code in a 2016 Chevrolet Silverado?

- Repair options may include repairing or replacing damaged wiring, replacing the fuel pump driver control module, or addressing any issues with the engine control module. Professional diagnosis and repair are recommended.

6. Can driving with the U18A2 code present cause further damage to my 2016 Chevrolet Silverado?

- Driving with the U18A2 code can potentially lead to fuel pump-related issues, engine performance problems, and even vehicle stalling, so it's advisable to address the underlying cause promptly.

7. Is it safe to continue driving my 2016 Chevrolet Silverado with the U18A2 code?

- It is not recommended to continue driving your vehicle with the U18A2 code present, as it can affect the fuel pump's operation and lead to potential safety hazards or further damage to the vehicle.

8. How much does it typically cost to repair the U18A2 code in a 2016 Chevrolet Silverado?

- The cost of repairing the U18A2 code can vary depending on the specific issue causing the communication loss and the required repairs. Costs may include parts and labor for diagnosis and replacement of components.

9. Can I reset the U18A2 code in my 2016 Chevrolet Silverado using an OBDII scanner?

- Resetting the U18A2 code with an OBDII scanner may clear the code temporarily, but it is crucial to address the underlying issue causing the communication loss to prevent the code from reappearing.

10. How can I prevent the U18A2 code from reoccurring in my 2016 Chevrolet Silverado?

- To prevent the U18A2 code from reoccurring, ensure regular maintenance of the vehicle's electrical system, promptly address any wiring issues, and follow the manufacturer's recommended service intervals for your Chevrolet Silverado.