What Does P1480 Mean?
The cooling fan relay 1 circuit is reading higher than expected voltage on the input side. This typically indicates a short to voltage in the control circuit, a failed relay with shorted contacts, or a feedback voltage issue.
Common Causes
35%
Shorted cooling fan relay with contacts stuck closed
30%
Short to power in relay control circuit wiring
15%
Failed fan motor causing excessive current draw and voltage spike
12%
Failed fan control module with shorted output
8%
Damaged wiring harness with exposed wire contacting power source
Diagnostic Steps
1
Step 1: Remove fan relay 1 and test relay for proper resistance and no shorts between contacts
2
Step 2: With relay removed, check for voltage at relay control terminal from PCM (should be 0V with fan off)
3
Step 3: Inspect wiring harness for damage, chafing, or exposed wires near heat sources or sharp edges
4
Step 4: Test fan motor current draw with ammeter to verify it's within specifications
5
Step 5: Check for voltage feedback through fan motor or other parallel circuits
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The cooling fan relay 1 circuit is reading higher than expected voltage on the input side. This typically indicates a short to voltage in the control circuit, a failed relay with shorted contacts, or a feedback voltage issue.
The most common cause of P1480 (Cooling fan relay 1 circuit high input) is: Shorted cooling fan relay with contacts stuck closed
Typical repair costs for P1480 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Moderate concern. Fan may run continuously draining battery, or may not operate when needed causing overheating. Monitor coolant temperature closely.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1480 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Manufacturer
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