AutoCodes - Generic - U1794

U1794 Code - Lack of Acknowledgment For Mirrors

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3
Table of contents

|U1794 code possible causes

  • Faulty Mirrors
  • Mirrors harness is open or shorted
  • Mirrors circuit poor electrical connection

|How do I fix the U1794 code?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

|Cost of diagnosing the U1794 code

Labor: 1.0

The cost of diagnosing the U1794 code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are U1794 code possible symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

|U1794 code description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. CAN bus uses two dedicated wires for communication. The wires are called CAN high and CAN low. When the CAN bus is in idle mode, both lines carry 2.5V. When data bits are being transmitted, the CAN high line goes to 3.75V, and the CAN low drops to 1.25V, thereby generating a 2.5V differential between the lines. Since communication relies on a voltage differential between the two bus lines, the CAN bus is NOT sensitive to inductive spikes, electrical fields, or other noise. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Mirrors has not been received.
OBDII Code U1794 - Lack of Acknowledgment For Mirrors -

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|Need help with a U1794 code?

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|U1794 code comments

Help us improve Leave a comment below or tell us if the information above helps you fix the code. What are the symptoms on your vehicle for the U1794 code? Have you replaced any parts?
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