AutoCodes – GMC – P2632 GMC

P2632 GMC Code - Fuel Transfer Pump Relay Control Circuit

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: P2632 GMC indicates Fuel Transfer Pump Relay Control Circuit.
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.

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Code Popularity 838

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 01, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2632 GMC Description

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. The ECM provides ignition positive voltage to the coil side of the fuel transfer pump relay. The ECM energizes the fuel transfer pump relay, which applies power to the fuel transfer pump.
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.

OBDII Code P2632 GMC - Fuel Transfer Pump Relay Control Circuit - AutoCodes.com — P2632 GMC Code - Fuel Transfer Pump Relay Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2632 GMC?

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 P2632 GMC?

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 P2632 GMC 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 P2632 GMC code?

Need more information on how to fix the P2632 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2632 GMC Code

1. What are the common symptoms of OBDII code P2632 GMC related to the Fuel Transfer Pump Relay Control Circuit?

- Common symptoms include issues with fuel transfer, decreased fuel efficiency, and possibly engine stalling.

2. What are the typical causes of OBDII code P2632 GMC?

- The code is often triggered by a faulty fuel transfer pump relay, wiring issues, or a malfunctioning fuel transfer pump.

3. How can I diagnose the root cause of OBDII code P2632 GMC?

- Diagnose by checking the fuel transfer pump relay, inspecting the wiring for damage, and testing the fuel transfer pump functionality.

4. Can a bad fuel transfer pump relay be repaired or does it need to be replaced?

- In most cases, a faulty fuel transfer pump relay will need to be replaced to resolve the P2632 code.

5. Are there any precautionary measures to take when dealing with OBDII code P2632 GMC?

- It is advisable to address the issue promptly to avoid potential fuel transfer problems or engine performance issues.

6. Is it safe to continue driving with OBDII code P2632 GMC present?

- It is not recommended to drive with the code active, as it can lead to fuel transfer issues and potential engine stalling.

7. Can weather conditions affect the appearance of OBDII code P2632 GMC?

- Extreme weather conditions can potentially impact the performance of the fuel transfer pump relay, leading to the code being triggered.

8. How can I reset OBDII code P2632 GMC after the issue has been addressed?

- After repairing or replacing the faulty components, the code can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes.

9. Are there any DIY repair tips for fixing OBDII code P2632 GMC?

- While diagnosing and repairing this code may require some technical knowledge, DIY enthusiasts can start by checking the relay and wiring connections for any obvious issues.

10. How can a professional mechanic help in resolving OBDII code P2632 GMC?

- A professional mechanic can conduct a comprehensive diagnostic scan, accurately identify the root cause of the code, and perform the necessary repairs or replacements to resolve the issue effectively.