P0495 2018 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 2018 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 2018 GMC Sierra Description
What are the Possible Causes of the DTC P0495 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What does the OBDII code P0495 mean on a 2018 GMC Sierra?
Code P0495 indicates that the engine cooling fan is operating at an unexpectedly high speed, which may result from an electrical or mechanical issue.
2. What are common symptoms of code P0495 in a 2018 GMC Sierra?
Symptoms include excessively loud fan noise, reduced fuel efficiency, higher engine cooling fan speeds, and potential engine overheating.
3. What causes the P0495 code on a 2018 GMC Sierra?
Common causes include a faulty cooling fan relay, damaged fan motor, wiring issues, or a malfunctioning engine control module (ECM).
4. Can code P0495 cause engine damage in my GMC Sierra?
While the fan running too fast may not directly cause engine damage, prolonged overheating or electrical faults could lead to serious issues.
5. How can I diagnose code P0495 on a 2018 GMC Sierra?
Start by inspecting the cooling fan, relay, and associated wiring for damage, then check the ECM for potential errors.
6. Can I drive my 2018 GMC Sierra with the P0495 code?
It is possible to drive short distances, but prolonged operation with this code may cause overheating or impact fuel efficiency.
7. How do I fix the P0495 code on a 2018 GMC Sierra?
Repairs may involve replacing the cooling fan relay, repairing damaged wiring, or addressing ECM issues.
8. How much does it cost to repair the P0495 code?
Costs vary depending on the issue, with fan relay replacements typically costing $50-$150, and more extensive repairs potentially costing several hundred dollars.
9. Does clearing the P0495 code with a scanner fix the issue?
Clearing the code temporarily removes the warning, but the underlying problem must be addressed to prevent the code from returning.
10. How can I prevent the P0495 code from appearing in the future?
Regular maintenance, including inspections of the cooling system components and wiring, can help prevent this issue from recurring.
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