P2633 Chevrolet Code - Fuel Transfer Pump Relay Control Circuit Low 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
- P2633 Chevrolet indicates Fuel Transfer Pump Relay Control Circuit Low 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 P2633 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 P2633 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 P2633 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 P2633 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.
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Frequently Asked Questions about P2633 Chevrolet Code
1. What are the common symptoms of OBDII code P2633 in a Chevrolet related to the Fuel Transfer Pump Relay Control Circuit Low Voltage?
- Common symptoms include difficulty starting the vehicle, stalling, reduced engine performance, and illuminated Check Engine light.
2. What can cause the OBDII code P2633 in a Chevrolet indicating Fuel Transfer Pump Relay Control Circuit Low Voltage?
- Possible causes include a faulty fuel transfer pump relay, damaged wiring or connectors in the circuit, or a malfunctioning powertrain control module (PCM).
3. How can I diagnose the OBDII code P2633 in my Chevrolet related to the Fuel Transfer Pump Relay Control Circuit Low Voltage?
- Diagnosis involves checking the fuel transfer pump relay, inspecting the wiring and connectors for damage, and using a scan tool to monitor voltage readings in the circuit.
4. Can a bad fuel transfer pump cause the OBDII code P2633 in a Chevrolet?
- While a failing fuel transfer pump can contribute to low voltage issues, the code is more commonly associated with problems in the relay control circuit itself.
5. What are some repair tips for fixing the OBDII code P2633 in a Chevrolet with the Fuel Transfer Pump Relay Control Circuit Low Voltage?
- Repair tips may include replacing the fuel transfer pump relay, repairing damaged wiring or connectors, and resetting the fault code with a scan tool after repairs are completed.
6. Is it safe to continue driving my Chevrolet with the OBDII code P2633 related to the Fuel Transfer Pump Relay Control Circuit Low Voltage?
- It is not recommended to drive the vehicle extensively with this code present, as it can lead to potential fuel delivery issues and engine performance problems.
7. How much does it typically cost to repair the OBDII code P2633 in a Chevrolet caused by Fuel Transfer Pump Relay Control Circuit Low Voltage?
- Repair costs can vary depending on the exact cause of the issue, but expenses may range from $100 to $300 for parts and labor.
8. Can I reset the OBDII code P2633 in my Chevrolet myself after fixing the underlying issue?
- Yes, the code can be reset using an OBDII scanner tool, which can clear the fault code from the vehicle's memory after repairs have been made.
9. Are there any preventive measures I can take to avoid encountering the OBDII code P2633 in my Chevrolet in the future?
- Regular vehicle maintenance, including inspecting and replacing worn components like relays and wiring, can help prevent issues that may trigger this fault code.
10. How urgent is it to address the OBDII code P2633 in a Chevrolet indicating Fuel Transfer Pump Relay Control Circuit Low Voltage?
- It is recommended to address this code promptly to prevent potential fuel delivery problems and ensure the vehicle operates safely and efficiently.
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