AutoCodes – GMC – P0495 GMC

P0495 GMC Code - Fan Speed High

Quick Answer

The cooling fan relay sends a Pulse Width Modulation (PWM) signal of 12 - 14 volts to the cooling fan clutch through the cooling fan clutch solenoid voltage control circuit. Common causes include Faulty Cooling Fan Relay, Cooling Fan Relay harness is open or shorted, Cooling Fan 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: P0495 GMC indicates Fan Speed High.
Common causes: Common causes include Faulty Cooling Fan Relay, Cooling Fan Relay harness is open or shorted, Cooling Fan 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 3,241

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Jun 29, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0495 GMC Description

The cooling fan relay sends a Pulse Width Modulation (PWM) signal of 12 - 14 volts to the cooling fan clutch through the cooling fan clutch solenoid voltage control circuit. The cooling fan relay varies the voltage drop across the cooling fan clutch solenoid in relation to a pulse width modulated signal from the Engine Control Module (ECM) in order to control the speed of the cooling fan. The signal controls the position of the oil control valve inside the cooling fan clutch housing. The Diagnostic Trouble Code (DTC) will be set if the clutch fluid pump-out, which is the time it takes for the fan clutch to disengage completely, is greater than a range of 10 minutes at sea level to 52 minutes at elevations of 6, 500 ft.

OBDII Code P0495 GMC - Fan Speed High - AutoCodes.com — P0495 GMC Code - Fan Speed High

What does this mean?

What are the Possible Causes of the DTC P0495 GMC?

Faulty Cooling Fan Relay
Cooling Fan Relay harness is open or shorted
Cooling Fan Relay circuit poor electrical connection
Faulty cooling fan clutch
Faulty control unit

How to Fix the DTC P0495 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

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0495 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 P0495 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P0495 2014 GMC Sierra — Fan Speed High
P0495 2015 GMC Sierra — Fan Speed High
P0495 2016 GMC Sierra — Fan Speed High
P0495 2017 GMC Sierra — Fan Speed High
P0495 2018 GMC Sierra — Fan Speed High

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 P0495 GMC Code

1. What are the common symptoms of OBDII code P0495 (GMC) Fan Speed High?

- Common symptoms include the radiator fan running at a high speed constantly, poor engine performance, and potential overheating issues.

2. What are the possible causes of OBDII code P0495 (GMC) Fan Speed High?

- Possible causes can include a faulty cooling fan control module, damaged wiring or connectors, or a malfunctioning engine coolant temperature sensor.

3. How can I diagnose the OBDII code P0495 (GMC) Fan Speed High?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the code, checking the cooling fan operation, inspecting wiring and connectors, and testing relevant components like the control module and temperature sensor.

4. What are the repair options for OBDII code P0495 (GMC) Fan Speed High?

- Repair options may include replacing the cooling fan control module, repairing damaged wiring or connectors, or replacing the engine coolant temperature sensor if found to be faulty.

5. Can I drive my vehicle with OBDII code P0495 (GMC) Fan Speed High?

- It is not recommended to drive your vehicle with this code as it can lead to engine overheating and potential damage. It is best to address the issue promptly.

6. How serious is OBDII code P0495 (GMC) Fan Speed High?

- This code should be taken seriously as it can cause engine overheating and lead to more severe issues if not addressed promptly.

7. Will resetting the OBDII code P0495 (GMC) Fan Speed High make it go away?

- Simply resetting the code may temporarily turn off the check engine light, but the underlying issue causing the code will likely persist and trigger the code again.

8. How much does it cost to repair OBDII code P0495 (GMC) Fan Speed High?

- The cost of repair can vary depending on the specific cause of the code, but it may involve parts and labor costs ranging from $100 to $500 or more.

9. Can a DIY enthusiast fix OBDII code P0495 (GMC) Fan Speed High?

- Depending on the underlying cause, a DIY enthusiast with the necessary tools and knowledge may be able to address this code by replacing components like the cooling fan control module or temperature sensor.

10. How can I prevent OBDII code P0495 (GMC) Fan Speed High from occurring again?

- Regularly inspecting and maintaining your vehicle's cooling system, checking for any signs of overheating, and addressing any issues promptly can help prevent this code from recurring.