AutoCodes – GMC – P1172 GMC

P1172 GMC Code - Fuel Pump Insufficient Flow

Quick Answer

The fuel pump is located on the left frame rail between the fuel tanks. 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: P1172 GMC indicates Fuel Pump Insufficient Flow.
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.

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Code Popularity 7,270

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 01, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code P1172 GMC Description

The fuel pump is located on the left frame rail between the fuel tanks. The Engine Control Module (ECM) provides ignition positive voltage to the coil side of the fuel pump relay. The ECM energizes the fuel pump relay, which applies power to the fuel pump. Fuel is transferred from the rear fuel tank to the front fuel tank in order to ensure all of the usable fuel volume is available to the engine. This Diagnostic Trouble Code (DTC) sets when the ECM commands the transfer fuel pump ON and a predetermined change in the front and rear fuel level sensors does not occur.

OBDII Code P1172 GMC - Fuel Pump Insufficient Flow - AutoCodes.com — P1172 GMC Code - Fuel Pump Insufficient Flow

What does this mean?

What are the Possible Causes of the DTC P1172 GMC?

Faulty Fuel Pump
Fuel Pump harness is open or shorted
Fuel Pump circuit poor electrical connection

How to Fix the DTC P1172 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 does this mean?

Code Tech Notes

There is a factory service bulletin for the following GMC Models:
2001 GMC Sierra
2002 GMC Sierra
2003 GMC Sierra
2004 GMC Sierra
2005 GMC Sierra
2001-2005 GMC Sierra Factory Service Bulletin OBDII Code P1172

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1172 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 P1172 GMC code?

Need more information on how to fix the P1172 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1172 GMC code diagnosed by a professional: Find a repair shop in your area

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 P1172 GMC Code

1. What are the common symptoms of OBDII code P1172 GMC (Fuel Pump Insufficient Flow)?

- Common symptoms include rough idling, poor acceleration, engine stalling, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P1172 GMC?

- Possible causes include a failing fuel pump, clogged fuel filter, fuel pressure regulator issues, or a faulty fuel pump control module.

3. How can I diagnose the cause of OBDII code P1172 GMC?

- Diagnose the issue by checking fuel pressure with a gauge, inspecting the fuel pump and related components, and scanning for any other related trouble codes.

4. Can a clogged fuel filter trigger OBDII code P1172 GMC?

- Yes, a clogged fuel filter can restrict fuel flow and lead to insufficient flow, triggering the P1172 code.

5. Is it safe to continue driving with OBDII code P1172 GMC active?

- It is not recommended to continue driving with this code, as it can lead to engine performance issues and potential damage to the fuel system.

6. How can I repair OBDII code P1172 GMC related to Fuel Pump Insufficient Flow?

- Repair options may include replacing the fuel pump, cleaning or replacing the fuel filter, checking and repairing any damaged fuel lines, and ensuring proper fuel pressure.

7. Can a faulty fuel pressure regulator cause OBDII code P1172 GMC?

- Yes, a faulty fuel pressure regulator can disrupt the fuel flow and pressure, triggering the P1172 code.

8. What role does the fuel pump control module play in triggering OBDII code P1172 GMC?

- The fuel pump control module regulates the fuel pump's operation, and if it malfunctions, it can lead to insufficient fuel flow and trigger the P1172 code.

9. How can I prevent OBDII code P1172 GMC from recurring in the future?

- Regularly maintain your vehicle by following the manufacturer's recommended service schedule, using quality fuel, and promptly addressing any fuel system issues.

10. Can extreme weather conditions impact OBDII code P1172 GMC?

- Yes, extreme cold or hot weather can affect fuel delivery, potentially leading to insufficient flow issues and triggering the P1172 code.