U18A2 2015 GMC Sierra 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 2015 GMC Sierra 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 2015 GMC Sierra Description
What are the Possible Causes of the DTC U18A2 2015 GMC Sierra?
- 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 2015 GMC Sierra?
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 2015 GMC Sierra 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 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code U18A2 in a 2015 GMC Sierra related to lost communication with the fuel pump driver control module?
- Common symptoms may include issues with starting the vehicle, engine stalling, fuel pump not functioning properly, and the check engine light illuminating.
2. What are the possible causes of OBDII code U18A2 in a 2015 GMC Sierra indicating lost communication with the fuel pump driver control module?
- Potential causes may include a faulty fuel pump driver control module, damaged wiring or connectors, a malfunctioning fuel pump, or issues with the vehicle's PCM (powertrain control module).
3. How can I diagnose the issue causing OBDII code U18A2 in my 2015 GMC Sierra?
- Diagnosing the problem may involve using a diagnostic scanner to retrieve the trouble codes, checking the wiring and connectors for any damage, testing the fuel pump driver control module, and ensuring proper communication between components.
4. Is it safe to continue driving my 2015 GMC Sierra with OBDII code U18A2 indicating lost communication with the fuel pump driver control module?
- It is not recommended to drive the vehicle with this issue, as it can lead to potential safety hazards such as engine stalling or fuel delivery problems.
5. How can I repair OBDII code U18A2 in my 2015 GMC Sierra related to lost communication with the fuel pump driver control module?
- Repair options may include replacing the fuel pump driver control module, repairing or replacing damaged wiring or connectors, testing and possibly replacing the fuel pump, and ensuring proper programming and communication within the vehicle's systems.
6. Can a DIY enthusiast fix OBDII code U18A2 in a 2015 GMC Sierra, or is it best left to a professional mechanic?
- While some basic diagnosis and repairs can be attempted by a DIY enthusiast, dealing with complex electrical issues like lost communication with the fuel pump driver control module may be best handled by a professional mechanic with the proper tools and expertise.
7. Will resetting the trouble codes clear OBDII code U18A2 in my 2015 GMC Sierra?
- Resetting the trouble codes may temporarily clear the code, but if the underlying issue causing the lost communication with the fuel pump driver control module is not addressed, the code is likely to reappear.
8. How much can I expect to pay for repairs related to OBDII code U18A2 in a 2015 GMC Sierra at a dealership or auto repair shop?
- The cost of repairs for this issue can vary depending on the exact cause of the problem, but it is advisable to contact a dealership or auto repair shop for an accurate estimate based on diagnostics and required repairs.
9. Are there any recalls or technical service bulletins related to OBDII code U18A2 in a 2015 GMC Sierra?
- It's recommended to check with GMC or a trusted dealership for any recalls or technical service bulletins related to the specific OBDII code U18A2 for your 2015 GMC Sierra.
10. How can I prevent OBDII code U18A2 from occurring in my 2015 GMC Sierra in the future?
- Regular maintenance, timely repairs of any related issues, and ensuring proper care of the vehicle's electrical components can help prevent OBDII code U18A2 indicating lost communication with the fuel pump driver control module in the future.
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