P2635 2015 GMC Sierra Code - Fuel Pump Flow Performance
Quick Answer
The Engine Control Module (ECM) supplies voltage to the fuel pump driver control module when the ECM detects that the ignition is on. Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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
- P2635 2015 GMC Sierra indicates Fuel Pump Flow Performance.
- Common causes
- Common causes include Faulty Fuel Pump, Fuel Pump harness is open or shorted, Fuel Pump 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 P2635 2015 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the fuel pump driver control module detects a difference of ± 60 kPa (8.7 PSI) at 400 kPa (58 PSI) request or ±45 kPa (6.5 PSI) at 300 kPa (43.5 PSI) request between the desired fuel pressure and the actual fuel pressure for approximately 10 s.
What are the Possible Causes of the DTC P2635 2015 GMC Sierra?
- Faulty Fuel Pump
- Fuel Pump harness is open or shorted
- Fuel Pump circuit poor electrical connection
- Faulty Fuel Pump Control Module (if applicable)
How to Fix the DTC P2635 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 P2635 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.
Need more information about the P2635 2015 GMC Sierra code?
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Frequently Asked Questions about P2635 2015 GMC Sierra Code
1. What are the common symptoms of OBDII code P2635 in a 2015 GMC Sierra related to fuel pump flow performance?
The common symptoms include rough idling, engine stalling, reduced fuel efficiency, and difficulty starting the vehicle.
2. What are the possible causes of OBDII code P2635 in a 2015 GMC Sierra?
The code P2635 typically indicates issues with the fuel pump flow performance, which can be caused by a faulty fuel pump, clogged fuel filter, fuel pressure regulator problems, or wiring issues.
3. How can I diagnose the cause of OBDII code P2635 in my 2015 GMC Sierra?
Diagnosing the cause of P2635 may involve checking the fuel pump operation, inspecting the fuel filter for blockages, testing the fuel pressure regulator, and examining the wiring and connectors related to the fuel pump system.
4. Can a dirty fuel filter trigger OBDII code P2635 in a 2015 GMC Sierra?
Yes, a clogged or dirty fuel filter can restrict fuel flow and lead to inadequate fuel pump performance, triggering code P2635 in the GMC Sierra.
5. What are some repair tips for addressing OBDII code P2635 in a 2015 GMC Sierra?
Repair tips may include replacing the fuel filter, testing and potentially replacing the fuel pump, checking and repairing any wiring issues, and ensuring proper fuel pressure in the system.
6. Is it safe to continue driving a 2015 GMC Sierra with OBDII code P2635 related to fuel pump flow performance?
It is not recommended to continue driving the vehicle with code P2635, as it can lead to potential engine performance issues and may cause further damage to the fuel system components.
7. Can resetting the OBDII system clear code P2635 in a 2015 GMC Sierra?
While resetting the OBDII system may temporarily clear the code, it is important to diagnose and address the underlying issue causing code P2635 to prevent it from reoccurring.
8. How much does it typically cost to repair OBDII code P2635 in a 2015 GMC Sierra?
The cost of repairing code P2635 can vary depending on the specific cause, but it may range from a few hundred dollars for a simple fix like replacing the fuel filter to over a thousand dollars for more complex repairs involving the fuel pump.
9. Can a DIY enthusiast fix OBDII code P2635 in a 2015 GMC Sierra, or is it best left to a professional mechanic?
While some aspects of diagnosing and repairing code P2635 can be tackled by a DIY enthusiast, dealing with fuel system components like the fuel pump may require specialized tools and expertise, making it advisable to consult a professional mechanic.
10. How often does OBDII code P2635 related to fuel pump flow performance occur in 2015 GMC Sierra vehicles?
While the frequency of occurrence may vary, code P2635 related to fuel pump flow performance is a relatively common issue in 2015 GMC Sierra vehicles, especially as they age and the fuel system components wear out.
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