AutoCodes – GMC – P0480 GMC

P0480 GMC Code - Cooling Fan 1 Control Circuit

Quick Answer

The engine cooling fan system is composed of electric cooling fan and a cooling fan control module. Common causes include Faulty Cooling Fan 1 Relay, Cooling Fan 1 Relay harness is open or shorted, Cooling Fan 1 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: P0480 GMC indicates Cooling Fan 1 Control Circuit.
Common causes: Common causes include Faulty Cooling Fan 1 Relay, Cooling Fan 1 Relay harness is open or shorted, Cooling Fan 1 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 30,688

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 Jul 19, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0480 GMC Description

The engine cooling fan system is composed of electric cooling fan and a cooling fan control module. The Engine Control Module (ECM) controls the fan speed by sending a Pulse Width Modulated (PWM) signal to the cooling fan control module. The cooling fan control module varies the voltage drop across the cooling fan motor in relation to the pulse width modulated signal, allowing the cooling fan to operate at variable speeds. The cooling fan speed is affected by many different operating conditions and the ECM will adjust the duty cycle based on cooling system requirements.
Generally, the ECM will operate the cooling fan at specific percentages but, may scale the percentages either higher or lower in response to generator demand. The percentages at which the cooling fan operates may vary between vehicle lines and engines.
The cooling fan control module is thermally protected to prevent module damage in the case of a short circuit condition in the cooling fan motor. The scan tool output control is only capable of operating the cooling fan in the speed percentages allowed by the ECM. When multiple cooling fan speed requests are received, the ECM operates the fan at the highest of the speed requests.
The Diagnostic Trouble Code (DTC) will be set when the commanded state of the driver and the actual state of the control circuit do not match for greater than 5 s.

**Cooling Fan design may vary

OBDII Code P0480 GMC - Cooling Fan 1 Control Circuit - AutoCodes.com — P0480 GMC Code - Cooling Fan 1 Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0480 GMC?

Faulty Cooling Fan 1 Relay
Cooling Fan 1 Relay harness is open or shorted
Cooling Fan 1 Relay circuit poor electrical connection
Faulty Cooling Fan 1
Faulty Cooling Fan Control Module
Faulty Engine Control Module (ECM)

How to Fix the DTC P0480 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 P0480 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 P0480 GMC code?

Need more information on how to fix the P0480 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0480 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0480 2014 GMC Sierra — Cooling Fan Speed Output Circuit
P0480 2015 GMC Sierra — Cooling Fan Speed Output Circuit
P0480 2016 GMC Sierra — Cooling Fan Speed Output Circuit
P0480 2017 GMC Sierra — Cooling Fan Speed Output Circuit
P0480 2018 GMC Sierra — Cooling Fan Speed Output Circuit

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 P0480 GMC Code

1. What are common symptoms of OBDII code P0480 GMC?

The common symptoms of OBDII code P0480 GMC include the cooling fan not working, engine overheating, and the Check Engine light illuminating on the dashboard.

2. What are some possible causes of OBDII code P0480 GMC?

Possible causes of OBDII code P0480 GMC include a faulty cooling fan motor, a malfunctioning cooling fan relay, wiring issues, or a problem with the engine coolant temperature sensor.

3. How can I diagnose the OBDII code P0480 GMC?

To diagnose OBDII code P0480 GMC, you can use a scan tool to retrieve the code, inspect the cooling fan and related components for any visible damage, test the cooling fan motor and relay for functionality, and check the wiring and connectors for any signs of corrosion or damage.

4. What are some repair tips for fixing OBDII code P0480 GMC?

Repair tips for fixing OBDII code P0480 GMC include replacing the faulty cooling fan motor or relay, repairing any damaged wiring or connectors, ensuring proper coolant levels, and clearing the trouble code with a scan tool after completing the repairs.

5. Can I continue driving with OBDII code P0480 GMC?

It is not recommended to continue driving with OBDII code P0480 GMC, as it can lead to engine overheating and potential damage. It is best to address the issue promptly to prevent further problems.

6. How much does it typically cost to repair OBDII code P0480 GMC?

The cost to repair OBDII code P0480 GMC can vary depending on the specific cause of the issue, the cost of parts, and labor rates. Repairs may range from a few hundred dollars to over a thousand dollars, depending on the extent of the problem.

7. Can I reset OBDII code P0480 GMC on my own?

You can reset OBDII code P0480 GMC on your own using a scan tool that has the capability to clear trouble codes. However, it is important to address the underlying issue causing the code before clearing it to prevent it from returning.

8. How can I prevent OBDII code P0480 GMC from occurring again?

To prevent OBDII code P0480 GMC from occurring again, you can perform regular maintenance on your cooling system, including inspecting the cooling fan, relay, and wiring for any issues, ensuring proper coolant levels, and addressing any overheating issues promptly.

9. Is OBDII code P0480 GMC a serious issue?

OBDII code P0480 GMC can be a serious issue if left unresolved, as it can lead to engine overheating and potential damage. It is important to address the problem promptly to prevent further complications.

10. Can a DIY enthusiast repair OBDII code P0480 GMC?

A DIY enthusiast with the necessary tools, knowledge, and experience working on automotive systems may be able to repair OBDII code P0480 GMC. However, if you are not confident in your abilities, it is recommended to seek professional help to ensure the issue is properly diagnosed and repaired.