AutoCodes - Generic - U1797

U1797 Code - Lack of Acknowledgment For Door Locks

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

|U1797 code possible causes

  • Faulty Door Locks
  • Door Locks harness is open or shorted
  • Door Locks circuit poor electrical connection

|How do I fix the U1797 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 U1797 code

Labor: 1.0

The cost of diagnosing the U1797 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 U1797 code possible symptoms?

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

|U1797 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 Door Locks has not been received.
OBDII Code U1797 - Lack of Acknowledgment For Door Locks -

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|U1797 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 U1797 code? Have you replaced any parts?
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