P0495 on 2002-2009 GMC Envoy — Fan Speed High
1 vehicles · 1 makes · $200-$500 repair
Most Reported On
P0495 is an OBD-II diagnostic trouble code meaning “Fan Speed High.” This code indicates the engine computer (PCM) has detected that the cooling fan is running faster than commanded, or at high speed when it should not be. The PCM monitors the cooling fan's operation and compares actual fan speed or current draw against expected values. While it usually does not leave you stranded, a fan stuck running high can drain the battery and points to an electrical control fault in the cooling system. This code is most commonly reported on 2002-2009 GMC Envoy, with repair costs ranging from $200 to $500.
Common Causes
Typical Repair Cost
Based on 1 documented vehicle-specific issues. Actual cost depends on root cause and vehicle.
Diagnostic Tools
To diagnose P0495, you'll need an OBD-II scanner. Here are our recommendations at every price point.
ANCEL AD310 Classic OBD-II Scanner
by ANCEL
A simple, affordable code reader that reads and clears check engine codes. Great for quick diagnostics on any OBD-II vehicle (1996+).
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- I/M readiness status
- No batteries or app needed
BlueDriver Pro Bluetooth Scanner
by BlueDriver
Bluetooth OBD-II scanner with a free companion app. Provides enhanced diagnostics, smog readiness, and repair reports sourced from a database of verified fixes.
- Enhanced diagnostics (ABS, SRS, transmission)
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- Smog check readiness
- Free app (iOS & Android)
LAUNCH CRP123X OBD-II Scanner
by LAUNCH
A professional-grade handheld scanner that reads all four major systems (engine, transmission, ABS, SRS) with live data streaming and graphing.
- Engine, transmission, ABS, SRS diagnostics
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- AutoVIN for vehicle identification
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Autel MaxiCOM MK808S Diagnostic Tool
by Autel
Shop-level diagnostic tablet with bi-directional control, active tests, and full system coverage. Ideal for serious DIYers and small shops.
- All-system diagnostics (25+ modules)
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- Oil reset, EPB, BMS, TPMS, injector coding
- 7-inch touchscreen with Android OS
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FAQ
What does P0495 mean?
P0495 stands for "Fan Speed High." This code indicates the engine computer (PCM) has detected that the cooling fan is running faster than commanded, or at high speed when it should not be. The PCM monitors the cooling fan's operation and compares actual fan speed or current draw against expected values. While it usually does not leave you stranded, a fan stuck running high can drain the battery and points to an electrical control fault in the cooling system.
What are the most common causes of P0495?
The most common causes of P0495 are: Faulty cooling fan relay stuck closed, Short to power in the fan control circuit, Failed fan control module or PCM driver, Damaged or corroded wiring/connectors at the fan, Faulty cooling fan motor, Engine coolant temperature sensor sending false high readings. The specific cause varies by vehicle.
How much does it cost to fix P0495?
Repair costs for P0495 range from $200 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P0495?
Au7o has documented P0495 across 1 vehicle models from 1 manufacturers: GMC.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.