P2634 Chevrolet Code - Fuel Transfer Pump Relay Control Circuit High Voltage
Quick Answer
The Engine Control Module (ECM) enables the secondary fuel pump relay when the primary fuel tank is below approximately 50 liters (13.2 gallons) and will run until the primary tank is filled to approximately 70 liters (18.5 gallons) or until the secondary tank is empty. Common causes include Faulty Secondary Fuel Pump Relay, Secondary Fuel Pump Relay harness is open or shorted, Secondary Fuel Pump Relay 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
- P2634 Chevrolet indicates Fuel Transfer Pump Relay Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Secondary Fuel Pump Relay, Secondary Fuel Pump Relay harness is open or shorted, Secondary Fuel Pump Relay 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 P2634 Chevrolet Description
The control module monitors the voltage on the fuel transfer pump relay control circuit. If the control module detects an incorrect voltage on the fuel transfer pump relay control circuit, a fuel transfer pump relay control Diagnostic Trouble Code (DTC) sets.
What are the Possible Causes of the DTC P2634 Chevrolet?
- Faulty Secondary Fuel Pump Relay
- Secondary Fuel Pump Relay harness is open or shorted
- Secondary Fuel Pump Relay circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P2634 Chevrolet?
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.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P2634 Chevrolet 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 P2634 Chevrolet code?
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Frequently Asked Questions about P2634 Chevrolet Code
1. What are the common symptoms of OBDII code P2634 in a Chevrolet related to the Fuel Transfer Pump Relay Control Circuit High Voltage?
- Common symptoms include engine stalling, difficulty starting the vehicle, and a decrease in fuel efficiency.
2. What are the possible causes of OBDII code P2634 in a Chevrolet?
- The code P2634 in a Chevrolet can be caused by a faulty fuel transfer pump relay, issues with the fuel transfer pump itself, or wiring problems in the relay control circuit.
3. How can I diagnose the OBDII code P2634 in my Chevrolet?
- To diagnose the code P2634, you can use an OBDII scanner to read the code and then inspect the fuel transfer pump relay, the fuel transfer pump, and the wiring in the relay control circuit for any visible damage or issues.
4. Is it safe to continue driving my Chevrolet with OBDII code P2634 present?
- It is not recommended to drive your Chevrolet with the OBDII code P2634 present, as it can lead to further damage to the fuel system and potentially cause safety hazards.
5. How can I repair OBDII code P2634 in my Chevrolet?
- Repairing the OBDII code P2634 in a Chevrolet typically involves replacing the faulty fuel transfer pump relay, repairing any wiring issues in the relay control circuit, or replacing the fuel transfer pump if necessary.
6. Can a DIY enthusiast fix OBDII code P2634 in a Chevrolet?
- While some DIY enthusiasts may be able to diagnose and repair OBDII code P2634 in a Chevrolet, it is recommended to seek professional help to ensure the issue is properly resolved.
7. Are there any preventive maintenance tips to avoid OBDII code P2634 in a Chevrolet?
- Regularly inspecting the fuel system components, such as the fuel transfer pump relay and pump, can help prevent issues that may lead to OBDII code P2634 in a Chevrolet.
8. How long does it typically take to repair OBDII code P2634 in a Chevrolet at a repair shop?
- The repair time for OBDII code P2634 in a Chevrolet can vary depending on the exact cause of the issue, but it may take a few hours to a full day to diagnose and fix the problem.
9. Are there any recalls or technical service bulletins related to OBDII code P2634 in Chevrolet vehicles?
- It is recommended to check with Chevrolet dealerships or online resources for any recalls or technical service bulletins related to OBDII code P2634 in Chevrolet vehicles to see if there are any known issues or solutions provided by the manufacturer.
10. What is the typical cost to repair OBDII code P2634 in a Chevrolet at a repair shop?
- The cost to repair OBDII code P2634 in a Chevrolet can vary depending on the specific cause of the issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.
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