P0495 2017 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 2017 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.
Code P0495 2017 GMC Sierra Description
What are the Possible Causes of the DTC P0495 2017 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 2017 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 is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P0495 2017 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.
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Frequently Asked Questions about P0495 2017 GMC Sierra Code
1. What does the OBDII code P0495 mean on a 2017 GMC Sierra?
P0495 indicates that the engine control module (ECM) has detected the cooling fan is operating at a higher speed than expected.
2. What are the symptoms of code P0495 in a 2017 GMC Sierra?
Common symptoms include the cooling fan running excessively loud or at high speed, reduced engine performance, and in some cases, the check engine light turning on.
3. What are the common causes of code P0495 in a 2017 GMC Sierra?
Possible causes include a faulty cooling fan relay, a shorted cooling fan control circuit, a malfunctioning cooling fan motor, or a defective engine control module.
4. Can driving with code P0495 damage my 2017 GMC Sierra?
While it may not immediately cause severe damage, prolonged operation with the fan running at high speed could lead to unnecessary wear on the fan motor and electrical components.
5. How is code P0495 diagnosed on a 2017 GMC Sierra?
A mechanic will typically inspect the cooling fan and relay, test the wiring and connectors for shorts or damage, and use a scan tool to monitor fan control signals from the ECM.
6. Can I fix code P0495 on my 2017 GMC Sierra myself?
If you're experienced with car repairs, you can inspect the cooling fan relay and wiring for damage. However, diagnosing complex electrical issues may require professional tools and expertise.
7. What parts might need to be replaced to fix code P0495 on a 2017 GMC Sierra?
Repairs may involve replacing the cooling fan relay, cooling fan motor, or repairing damaged wiring. In rare cases, the ECM itself may need replacement.
8. How much does it cost to fix code P0495 on a 2017 GMC Sierra?
The repair cost varies depending on the exact issue but typically ranges from $100 to $500, including parts and labor.
9. Can a faulty thermostat cause code P0495 on a 2017 GMC Sierra?
No, a faulty thermostat is unlikely to cause this code. P0495 specifically relates to the cooling fan operating at an unexpectedly high speed.
10. Will clearing the P0495 code with a scan tool fix the problem?
Clearing the code may temporarily turn off the check engine light, but unless the underlying issue is resolved, the code will likely return.
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