AutoCodes – Cadillac – U1160 Cadillac

U1160 Cadillac Code - Lost Communications With Driver Door Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Driver Door Module (DDM), Driver Door Module harness is open or shorted, Driver Door 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: U1160 Cadillac indicates Lost Communications With Driver Door Module.
Common causes: Common causes include Faulty Driver Door Module (DDM), Driver Door Module harness is open or shorted, Driver Door 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.

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Code Popularity 1,072

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1160 Cadillac Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1160 is set.

OBDII Code U1160 Cadillac - Lost Communications With Driver Door Module - AutoCodes.com — U1160 Cadillac Code - Lost Communications With Driver Door Module

What does this mean?

What are the Possible Causes of the DTC U1160 Cadillac?

Faulty Driver Door Module (DDM)
Driver Door Module harness is open or shorted
Driver Door Module circuit poor electrical connection

How to Fix the DTC U1160 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 U1160 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.

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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.

Frequently Asked Questions about U1160 Cadillac Code

What does the OBDII code U1160 mean on a Cadillac?

1. The U1160 code indicates a "Lost Communication With Driver Door Module," meaning the vehicle's control systems can't communicate with the driver door module (DDM). 2.

What are the common symptoms of code U1160 on a Cadillac?

Symptoms may include inoperative power windows, locks, or mirrors on the driverâ€™s door, malfunctioning keyless entry, or warning lights on the dashboard. 3.

What causes the U1160 code to appear in a Cadillac?

Common causes include a faulty driver door module, damaged wiring or connectors, a blown fuse, or issues with the CAN (Controller Area Network) communication system. 4.

Can I still drive my Cadillac with a U1160 code?

Yes, the car may still be drivable, but certain features like power windows and locks on the driverâ€™s door may not function properly, which can affect convenience and safety. 5.

How do I diagnose the U1160 code on my Cadillac?

Start by inspecting the wiring and connectors to the driver door module, checking for visible damage, corrosion, or loose connections. Then, use a scan tool to verify communication with the DDM. 6.

Does the U1160 code always mean the driver door module is faulty?

No, it might also be caused by wiring issues, a blown fuse, or a fault in the CAN communication network. Always diagnose thoroughly before replacing parts. 7.

How much does it cost to fix the U1160 code on a Cadillac?

The cost depends on the root cause. Replacing the driver door module may cost $200â€“$500, while repairing wiring or connectors could be less expensive. 8.

Can a dead battery trigger the U1160 code on a Cadillac?

Yes, a weak or dead battery can disrupt communication between modules, potentially triggering the U1160 code. Ensure the battery is fully charged and functioning properly. 9.

What tools are needed to troubleshoot the U1160 code in a Cadillac?

Youâ€™ll need an OBDII scan tool capable of reading manufacturer-specific codes, a multimeter for electrical testing, and possibly wiring diagrams for the vehicle. 10.

Will clearing the U1160 code with a scan tool fix the problem?

Clearing the code may temporarily remove it, but if the underlying issue isnâ€™t resolved, the code will likely reappear. Proper diagnosis and repair are necessary.