AutoCodes – Generic – U1746

U1746 Code - Amplifier Module Missing Message

Quick Answer

The Amplifier Module receives pre-amplified audio signals from the Radio/Entertainment Telematics Module (ETM) and boosts them to drive the speakers. Common causes include Faulty Amplifier Module, Amplifier Module harness is open or shorted, Amplifier Module 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: U1746 indicates Amplifier Module Missing Message.
Common causes: Common causes include Faulty Amplifier Module, Amplifier Module harness is open or shorted, Amplifier Module 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 52

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 Nov 05, 2025

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code U1746 Description

The Amplifier Module receives pre-amplified audio signals from the Radio/Entertainment Telematics Module (ETM) and boosts them to drive the speakers. The ETM identifies whether the vehicle has an external or internal amplifier and, if external, disables its own speaker outputs, sending only audio input signals to the amplifier. All balance and fade adjustments are controlled by the ETM and transmitted to the Amplifier over the CAN bus, allowing the module to manage sound distribution across the vehicle’s multiple speakers (up to 12 channels in Premium 2 systems).

OBDII Code U1746 - Amplifier Module Missing Message - AutoCodes.com — U1746 Code - Amplifier Module Missing Message

What does this mean?

What are the Possible Causes of the DTC U1746?

Faulty Amplifier Module
Amplifier Module harness is open or shorted
Amplifier Module circuit poor electrical connection

How to Fix the DTC U1746?

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 U1746 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 U1746 code?

Need more information on how to fix the U1746 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1746 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1746 Alfa-romeo — Amplifier Module Missing Message
U1746 Chrysler — Amplifier Module Missing Message
U1746 Dodge — Amplifier Module Missing Message
U1746 Jeep — Amplifier Module Missing Message
U1746 RAM — Amplifier Module Missing Message

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.