AutoCodes – Chevrolet – P1481 Chevrolet

P1481 Chevrolet Code - Cooling Fan Speed Signal Lost

Quick Answer

The engine cooling fan is a variable speed fan. Common causes include Faulty Fan Clutch Assembly, Fan Clutch Assembly harness is open or shorted, Fan Clutch Assembly 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: P1481 Chevrolet indicates Cooling Fan Speed Signal Lost.
Common causes: Common causes include Faulty Fan Clutch Assembly, Fan Clutch Assembly harness is open or shorted, Fan Clutch Assembly 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.

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Code Popularity 29,192

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Aug 24, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P1481 Chevrolet Description

The engine cooling fan is a variable speed fan. The Engine Control Module (ECM) controls the fan speed by sending a pulse width modulated signal to the cooling fan speed control module. The cooling fan control module varies the voltage drop across the engine cooling fan motor in relation to the pulse width modulated signal. The cooling fan speed is affected by many different conditions and can be adjusted from 10-90 percent duty cycle. Ninety percent is considered high fan speed. When multiple cooling speed requests are received, the ECM uses the highest cooling fan speed of all the requests. During normal fan ON operation, the control circuit voltage will be low and near battery voltage when the fan is OFF.

OBDII Code P1481 Chevrolet - Cooling Fan Speed Signal Lost - AutoCodes.com — P1481 Chevrolet Code - Cooling Fan Speed Signal Lost

What does this mean?

What are the Possible Causes of the DTC P1481 Chevrolet?

Faulty Fan Clutch Assembly
Fan Clutch Assembly harness is open or shorted
Fan Clutch Assembly circuit poor electrical connection

How to Fix the DTC P1481 Chevrolet?

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 P1481 Chevrolet 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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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P1481 Chevrolet Code

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ken
Date: January 8, 2015 at 1:06 am

I replaced my fan hub with a new one. Cleared the code and drive it for 2 miles. After hitting a bump in the road. The check engine light went on and the speed reduction light came on. But the truck runs normal! So I clear the codes again and everytime I hit a bump or just let it ideal. It sets the check engine light. P1481 & p1484. Any ideas?

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