P2635 2014 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 2014 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 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra code?
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Frequently Asked Questions about P2635 2014 GMC Sierra Code
1. What are the common symptoms of OBDII code P2635 in a 2014 GMC Sierra related to fuel pump flow performance?
- Common symptoms include engine stalling, poor acceleration, reduced fuel efficiency, and difficulty starting the vehicle.
2. What are the possible causes of the OBDII code P2635 in a 2014 GMC Sierra?
- The code P2635 can be triggered by issues such as a faulty fuel pump, clogged fuel filter, fuel line restrictions, or a malfunctioning fuel pressure sensor.
3. How can I diagnose the OBDII code P2635 in my 2014 GMC Sierra?
- Diagnosing the code typically involves testing the fuel pump's flow rate, checking fuel pressure, inspecting the fuel filter for clogs, and scanning the vehicle's computer for related error codes.
4. Can a dirty fuel filter cause the OBDII code P2635 to appear in a 2014 GMC Sierra?
- Yes, a dirty or clogged fuel filter can restrict fuel flow to the engine, triggering the P2635 code related to fuel pump flow performance.
5. Is it safe to continue driving my 2014 GMC Sierra with the OBDII code P2635 present?
- It is not recommended to drive the vehicle with the P2635 code active, as it can lead to poor engine performance and potential fuel delivery issues, risking further damage.
6. How can I repair the OBDII code P2635 in my 2014 GMC Sierra?
- Repairing the P2635 code may involve replacing the fuel pump, cleaning or replacing the fuel filter, addressing fuel line obstructions, or repairing/replacing the fuel pressure sensor.
7. Can low fuel levels trigger the OBDII code P2635 in a 2014 GMC Sierra?
- Yes, operating the vehicle with consistently low fuel levels can cause fuel pump issues and potentially lead to the P2635 code related to fuel pump flow performance.
8. Are there any maintenance tips to prevent the OBDII code P2635 from appearing in a 2014 GMC Sierra?
- Regularly replacing the fuel filter, using high-quality fuel, keeping the fuel tank at least a quarter full, and following the manufacturer's recommended maintenance schedule can help prevent fuel pump-related issues.
9. Can extreme temperatures impact the fuel pump's performance and trigger the OBDII code P2635 in a 2014 GMC Sierra?
- Yes, extreme temperatures can affect the fuel pump's efficiency and lead to fuel flow problems, potentially causing the P2635 code to appear.
10. Should I reset the OBDII code P2635 in my 2014 GMC Sierra after making repairs?
- After addressing the underlying issue causing the P2635 code, it is recommended to reset the code using an OBDII scanner to clear the error from the vehicle's computer system.
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