AutoCodes – Cadillac – P1660 Cadillac

P1660 Cadillac Code - Cooling Fan Control Circuit

Quick Answer

P1660 Cadillac indicates Cooling Fan Control Circuit. Common causes include Faulty Cooling Fan Relay, Faulty Cooling Fan, Cooling Fan harness is open or shorted. 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: P1660 Cadillac indicates Cooling Fan Control Circuit.
Common causes: Common causes include Faulty Cooling Fan Relay, Faulty Cooling Fan, Cooling Fan harness is open or shorted.
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 17,623

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 Sep 06, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
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Code P1660 Cadillac Description

OBDII Code P1660 Cadillac - Cooling Fan Control Circuit - AutoCodes.com — P1660 Cadillac Code - Cooling Fan Control Circuit

What does this mean?

What are the Possible Causes of the DTC P1660 Cadillac?

Faulty Cooling Fan Relay
Faulty Cooling Fan
Cooling Fan harness is open or shorted
Cooling Fan circuit poor electrical connection

How to Fix the DTC P1660 Cadillac?

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 P1660 Cadillac 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.

Need more information about the P1660 Cadillac code?

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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.