P2633 Cadillac 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 Cadillac 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 Cadillac 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 Cadillac?
- 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 Cadillac?
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 Cadillac 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 Cadillac Code
1. What are the common symptoms of OBDII code P2633 in a Cadillac related to the Fuel Transfer Pump Relay Control Circuit Low Voltage?
The common symptoms include poor engine performance, difficulty starting the vehicle, and potential stalling or hesitation while driving.
2. What are the possible causes of OBDII code P2633 in a Cadillac?
Possible causes include a faulty fuel transfer pump relay, damaged wiring or connectors in the relay circuit, low voltage in the circuit, or a malfunctioning powertrain control module (PCM).
3. How can I diagnose the issue related to OBDII code P2633 in a Cadillac?
Diagnosis typically involves checking the fuel transfer pump relay, inspecting the wiring and connectors for damage, testing the voltage in the circuit, and using a diagnostic scanner to retrieve additional fault codes.
4. Can I drive my Cadillac with OBDII code P2633 present?
It is not recommended to drive your Cadillac with this code present, as it can lead to potential engine issues and further damage if left unresolved.
5. What are some repair tips for fixing OBDII code P2633 in a Cadillac?
Repair tips may include replacing the fuel transfer pump relay, repairing or replacing damaged wiring or connectors, ensuring proper voltage in the circuit, and resetting the fault codes with a diagnostic scanner after repairs are completed.
6. Is it safe to continue driving my Cadillac if the check engine light is on due to code P2633?
It is best to address the issue promptly to prevent any potential damage to the engine or fuel system. Continuing to drive with the check engine light on can lead to further complications.
7. How much does it typically cost to repair OBDII code P2633 in a Cadillac?
The cost of repair 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.
8. Can a DIY enthusiast fix OBDII code P2633 in a Cadillac?
While some may attempt to diagnose and repair this code themselves, it is recommended to have a professional mechanic with experience in automotive electrical systems handle the repair to ensure it is done correctly.
9. Will resetting the OBDII code P2633 in a Cadillac make it go away permanently?
Simply resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed and repaired, the code is likely to return and the symptoms may persist.
10. How urgent is it to address OBDII code P2633 in a Cadillac?
It is important to address this code promptly to prevent potential engine damage or safety hazards while driving. Ignoring the issue can lead to more severe problems over time.
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