P0495: Fan Speed High
The P0495 code indicates that the Engine Control Module (ECM) has detected the cooling fan operating at a higher speed than commanded. This is typically due to a short circuit in the fan control circuit, a faulty fan relay, or a malfunctioning fan motor. The ECM monitors fan speed via a feedback signal; if the actual speed exceeds the target, it sets this code.
01. Most Common Causes
- Short circuit in fan control circuit
- Faulty cooling fan relay
- Malfunctioning cooling fan motor
- ECM software or hardware issue
02. Symptoms You Will Notice
- Check Engine Light on
- Cooling fan running at high speed continuously
- Possible engine overheating if fan fails
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect fan wiring and connectors for damage or shorts.
Step 3: Test fan relay and fan motor operation using a multimeter.
Step 4: Check ECM fan control signal with a scan tool or oscilloscope.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe for short trips, but the fan running at high speed can drain the battery and may lead to overheating if the fan fails. Have it diagnosed soon.
How much does it cost to fix?▼
Typical repair costs range from $50 to $150 for parts like a relay or fan motor, plus labor if needed.