P0495 on GMC
Fan Speed High
P0495 on GMC vehicles indicates fan speed high. Au7o has documented this code across 1 GMC model — most commonly on Envoy. 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. Typical repair costs on GMC range from $200 to $500, depending on the specific model and root cause.
Common Causes of P0495
- •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
P0495 on GMC by Model
GMC Envoy(1 issue)
- Electric Cooling Fan Clutch Failure2002-2009
The electronically controlled fan clutch fails, causing overheating in traffic or at low speeds. The Envoy uses a clutch-type fan rather than electric fans, and the electronic control module in the clutch is the weak point.
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View P0495 across all makes →Frequently Asked Questions
What does P0495 mean on GMC?▼
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. On GMC specifically, this code is documented across 1 model.
What causes P0495 on GMC vehicles?▼
Common causes on GMC: 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. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0495 on a GMC?▼
Repair costs on GMC range from $200 to $500, depending on the specific model and root cause.
Which GMC models have P0495 documented?▼
Au7o has documented P0495 on 1 GMC model: Envoy.