AutoCodes – Generic – U1008

U1008 Code - Lost Communication With Radiator Shutter

Quick Answer

Lost Communication with Radiator Shutter also known as Active Air Flap. Common causes include Faulty Active Air Flap (AAF) system, Engine Control Module (ECM) np communication with Active Air Flap (AAF) system, Active Air Flap (AAF) system 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: U1008 indicates Lost Communication With Radiator Shutter.
Common causes: Common causes include Faulty Active Air Flap (AAF) system, Engine Control Module (ECM) np communication with Active Air Flap (AAF) system, Active Air Flap (AAF) system 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 41,976

How popular is this code, among other codes? Medium

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 Apr 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code U1008 Description

Lost Communication with Radiator Shutter also known as Active Air Flap.
Active Air Flap (AAF) system is equipped with a flip can be opened between radiator grille and radiator. During High speed driving, it will enhance the driving stability by closing the flap to reduce the air resistance. The Engine Control Module (ECM) will open the flap function if the inside the engine room temperature rises. The ECM sets the OBDII code when the Active Air Flap (AAF) system is not working to factory specifications.

OBDII Code U1008 - Lost Communication With Radiator Shutter - AutoCodes.com — U1008 Code - Lost Communication With Radiator Shutter

What does this mean?

What are the Possible Causes of the DTC U1008?

Faulty Active Air Flap (AAF) system
Engine Control Module (ECM) np communication with Active Air Flap (AAF) system
Active Air Flap (AAF) system harness is open or shorted
Active Air Flap (AAF) system poor electrical connection

How to Fix the DTC U1008?

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 U1008 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 U1008 code?

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Need Help with the Code?

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Information for Specific Makes

U1008 Chrysler — LIN 1 Bus Steering Column Control Module Electrical Diagnostic
U1008 Dodge — LIN 1 Bus Steering Column Control Module Electrical Diagnostic
U1008 Hyundai — Lost Communication With Radiator Shutter
U1008 Jeep — LIN 1 Bus Steering Column Control Module Electrical Diagnostic
U1008 KIA — Lost Communication With Radiator Shutter
U1008 RAM — LIN 1 Bus Steering Column Control Module Electrical Diagnostic

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.