P2635 2015 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 2015 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 2015 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 2015 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 2015 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 2015 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.
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Frequently Asked Questions about P2635 2015 Chevrolet Silverado Code
1. What does the OBDII code P2635 mean for a 2015 Chevrolet Silverado?
The code P2635 indicates a "Fuel Pump Flow Performance" issue, meaning the fuel pump is not delivering fuel at the expected rate.
2. What are the common symptoms of the P2635 code in a 2015 Chevrolet Silverado?
Symptoms include engine misfires, reduced power, difficulty starting, poor acceleration, and in some cases, the engine may stall.
3. What causes the P2635 code to appear in a 2015 Chevrolet Silverado?
Common causes include a failing fuel pump, clogged fuel filter, restricted fuel lines, faulty fuel pressure regulator, or electrical issues like damaged wiring or a bad fuel pump control module.
4. Can a dirty fuel filter trigger the P2635 code?
Yes, a clogged or dirty fuel filter can restrict fuel flow, causing the P2635 code to appear.
5. How do you diagnose the P2635 code in a 2015 Chevrolet Silverado?
Diagnosis typically involves checking fuel pressure with a gauge, inspecting the fuel pump and filter, examining wiring and connectors, and using a scan tool to verify the code and any related codes.
6. Is it safe to drive with the P2635 code in a 2015 Chevrolet Silverado?
Driving with this code is not recommended, as it can lead to poor engine performance, stalling, or further damage to the fuel system.
7. How much does it cost to fix the P2635 code on a 2015 Chevrolet Silverado?
Repair costs can range from $150 to $1,000, depending on whether the issue is a clogged fuel filter, a failing fuel pump, or other related components.
8. Can a failing fuel pump control module cause the P2635 code?
Yes, a malfunctioning fuel pump control module can result in improper fuel pump operation and trigger the P2635 code.
9. What are some repair tips for resolving the P2635 code in a 2015 Chevrolet Silverado?
Start by replacing the fuel filter if clogged, inspect and repair any damaged wiring, and test the fuel pump for proper operation. Replace faulty components as needed.
10. Will clearing the P2635 code fix the issue in a 2015 Chevrolet Silverado?
Clearing the code without addressing the underlying issue will not fix the problem. The code will likely return until proper repairs are made.
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