AutoCodes – GMC – P0495 2015 GMC Sierra

P0495 2015 GMC Sierra 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 2015 GMC Sierra 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 223

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 2015 GMC Sierra 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 2015 GMC Sierra - Fan Speed High - AutoCodes.com — P0495 2015 GMC Sierra Code - Fan Speed High

What does this mean?

What are the Possible Causes of the DTC P0495 2015 GMC Sierra?

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 2015 GMC Sierra?

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 2015 GMC Sierra 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 2015 GMC Sierra 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 P0495 2015 GMC Sierra Code

1. What does the OBDII code P0495 mean on a 2015 GMC Sierra?

P0495 indicates that the engine control module (ECM) has detected an unusually high speed in the engine cooling fan system.

2. What are the common symptoms of code P0495 in a 2015 GMC Sierra?

Symptoms may include a loud fan noise, increased engine cooling fan speed, reduced fuel efficiency, and potential overheating if the fan fails to operate correctly.

3. What causes the P0495 code to appear on a GMC Sierra?

Common causes include a faulty cooling fan motor, a malfunctioning fan clutch, a short in the fan wiring, or a defective engine control module (ECM).

4. Can I continue driving my 2015 GMC Sierra with the P0495 code?

Driving with this code is possible, but itâ€™s not recommended for long periods as it may lead to overheating or unnecessary wear on the cooling fan system.

5. How do you diagnose the P0495 code on a 2015 GMC Sierra?

A mechanic will typically check the cooling fan operation, inspect wiring and connectors for damage, test the fan relay, and use a scan tool to monitor fan speed and ECM signals.

6. What parts might need replacement to fix the P0495 code?

Potential parts include the cooling fan motor, fan clutch, fan relay, or in rare cases, the engine control module (ECM).

7. How much does it cost to repair the P0495 code on a GMC Sierra?

Repair costs can range from $150 to $500, depending on whether the issue is with the fan motor, relay, or wiring.

8. Can a faulty thermostat cause the P0495 code?

No, a faulty thermostat typically does not cause this code. P0495 is related specifically to the cooling fan speed being too high.

9. Is the P0495 code related to other cooling system issues?

Yes, it may indicate broader cooling system problems if the fan is compensating for overheating due to another issue like a clogged radiator or low coolant levels.

10. How can I prevent the P0495 code from occurring?

Regularly inspect and maintain your cooling system, including the fan, wiring, and connectors, and address any overheating issues promptly.