P2635 2016 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 2016 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 2016 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 2016 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 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.
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 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 P2635 2016 Chevrolet Silverado code?
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Frequently Asked Questions about P2635 2016 Chevrolet Silverado Code
1. What are the common symptoms of OBDII code P2635 in a 2016 Chevrolet Silverado related to fuel pump flow performance?
The common symptoms include poor engine performance, reduced fuel efficiency, stalling or hesitation during acceleration, and potential difficulty starting the vehicle.
2. What are the possible causes of OBDII code P2635 in a 2016 Chevrolet Silverado?
Possible causes include a faulty fuel pump, clogged fuel filter, fuel pressure regulator issues, wiring or electrical problems in the fuel pump circuit, or a malfunctioning fuel pump control module.
3. How can I diagnose the underlying issue causing OBDII code P2635 in my 2016 Chevrolet Silverado?
Diagnosis usually involves checking the fuel pump's operation, inspecting the fuel filter for clogs, testing the fuel pressure regulator, examining the wiring and connections in the fuel pump circuit, and scanning the fuel pump control module for faults.
4. Can I still drive my 2016 Chevrolet Silverado with OBDII code P2635 triggered?
It is not recommended to drive the vehicle with this code active, as it can lead to further damage to the fuel system and potentially cause more severe engine issues. It is best to address the problem promptly.
5. How can I repair OBDII code P2635 in my 2016 Chevrolet Silverado related to fuel pump flow performance?
Repair steps may include replacing the fuel pump, cleaning or replacing the fuel filter, fixing any wiring or connection issues, replacing the fuel pressure regulator, or addressing faults in the fuel pump control module.
6. Is it possible for a DIY enthusiast to fix OBDII code P2635 in a 2016 Chevrolet Silverado?
While some basic troubleshooting steps like checking connections and inspecting the fuel filter can be done by a DIY enthusiast, diagnosing and repairing complex issues with the fuel pump or control module may require professional expertise.
7. Will resetting the OBDII code P2635 in my 2016 Chevrolet Silverado resolve the issue temporarily?
Resetting the code without addressing the underlying problem will only temporarily clear the error code. The issue causing the code will persist and may lead to further complications if left unresolved.
8. How long does it typically take to repair OBDII code P2635 in a 2016 Chevrolet Silverado at a repair shop?
The repair time can vary depending on the specific cause of the code and the extent of the repair needed. It may take a few hours to a full day for a mechanic to diagnose and fix the issue.
9. Are there any preventive maintenance tips to avoid triggering OBDII code P2635 in my 2016 Chevrolet Silverado?
Regularly changing the fuel filter, using quality fuel, and following the manufacturer's recommended maintenance schedule for the fuel system can help prevent issues leading to code P2635.
10. Can extreme weather conditions affect the likelihood of OBDII code P2635 appearing in a 2016 Chevrolet Silverado?
Extreme hot or cold weather can potentially exacerbate existing fuel system issues that may trigger code P2635. It is essential to maintain the fuel system properly, especially in severe weather conditions, to prevent such codes from appearing.
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