P2635 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado 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 2018 Chevrolet Silverado?
- 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 2018 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.
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 2018 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 P2635 2018 Chevrolet Silverado code?
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Frequently Asked Questions about P2635 2018 Chevrolet Silverado Code
1. What are common symptoms of OBDII code P2635 in a 2018 Chevrolet Silverado related to fuel pump flow performance?
- Common symptoms include decreased engine performance, rough idling, stalling, and potential difficulty starting the vehicle.
2. What are possible causes of OBDII code P2635 in a 2018 Chevrolet Silverado indicating fuel pump flow performance issues?
- Possible causes may include a faulty fuel pump, clogged fuel filter, fuel pressure regulator problems, or issues with the fuel injectors.
3. How can I diagnose the OBDII code P2635 in a 2018 Chevrolet Silverado regarding fuel pump flow performance?
- Diagnosing this code may involve performing a fuel pressure test, checking fuel pump operation, inspecting the fuel filter, and scanning for any related trouble codes.
4. What steps can I take to repair OBDII code P2635 in a 2018 Chevrolet Silverado associated with fuel pump flow performance?
- Repair steps may include replacing the fuel pump, cleaning or replacing the fuel filter, checking and potentially replacing the fuel pressure regulator, and ensuring proper fuel system operation.
5. Can a DIY enthusiast address OBDII code P2635 in a 2018 Chevrolet Silverado related to fuel pump flow performance?
- While some basic troubleshooting steps can be performed by DIY enthusiasts, addressing this code effectively may require professional diagnostic tools and expertise for accurate repairs.
6. Are there any preventive maintenance tips to avoid encountering OBDII code P2635 in a 2018 Chevrolet Silverado due to fuel pump flow performance issues?
- Regularly servicing the fuel system, using quality fuel, and addressing any unusual symptoms promptly can help prevent fuel pump flow performance-related problems leading to this OBDII code.
7. What role does the fuel pump play in triggering OBDII code P2635 in a 2018 Chevrolet Silverado?
- The fuel pump is responsible for delivering fuel from the tank to the engine, and issues such as low flow or insufficient pressure from the fuel pump can trigger this OBDII code.
8. How urgent is it to address OBDII code P2635 in a 2018 Chevrolet Silverado linked to fuel pump flow performance?
- It is important to address this code promptly to prevent potential engine damage, poor performance, and safety hazards associated with fuel delivery issues.
9. Can other factors besides the fuel pump itself trigger OBDII code P2635 in a 2018 Chevrolet Silverado related to fuel pump flow performance?
- Yes, factors such as a clogged fuel filter, malfunctioning fuel pressure regulator, or fuel system leaks can also contribute to triggering this OBDII code.
10. Is it recommended to reset the OBDII code P2635 in a 2018 Chevrolet Silverado after addressing fuel pump flow performance issues?
- Yes, after resolving the underlying fuel pump flow performance problems, it is advisable to reset the code using an OBDII scanner to clear the vehicle's system and monitor for any reoccurrence.
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