AutoCodes – Cadillac – U1161 Cadillac

U1161 Cadillac Code - Lost Communications With Front Passenger 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 Front Passenger Door Module (FPDM), Front Passenger Door Module harness is open or shorted, Front Passenger 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: U1161 Cadillac indicates Lost Communications With Front Passenger Door Module.
Common causes: Common causes include Faulty Front Passenger Door Module (FPDM), Front Passenger Door Module harness is open or shorted, Front Passenger 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 995

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 Apr 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1161 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) U1161 is set.

OBDII Code U1161 Cadillac - Lost Communications With Front Passenger Door Module - AutoCodes.com — U1161 Cadillac Code - Lost Communications With Front Passenger Door Module

What does this mean?

What are the Possible Causes of the DTC U1161 Cadillac?

Faulty Front Passenger Door Module (FPDM)
Front Passenger Door Module harness is open or shorted
Front Passenger Door Module circuit poor electrical connection

How to Fix the DTC U1161 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 U1161 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 U1161 Cadillac Code

1. What are the common symptoms associated with OBDII code U1161 in a Cadillac indicating lost communications with the front passenger door module?

- Common symptoms include issues with power windows, door locks, mirror controls, and interior lights on the front passenger side not functioning properly.

2. What are some possible causes of the U1161 code in a Cadillac related to communication loss with the front passenger door module?

- Potential causes may include a faulty front passenger door module, damaged wiring harness, loose connections, or a malfunctioning body control module.

3. How can I diagnose the U1161 code in my Cadillac indicating a communication problem with the front passenger door module?

- Diagnose the issue by checking the wiring harness for any visible damage, ensuring all connections are secure, and using a diagnostic scan tool to communicate with the front passenger door module.

4. What are some recommended repair tips for resolving the U1161 code in a Cadillac due to lost communications with the front passenger door module?

- Repair tips may include repairing or replacing damaged wiring, ensuring all connections are tight, resetting the codes with a scan tool after repairs, and conducting a thorough system check.

5. Can the U1161 code be cleared/reset in a Cadillac after resolving the communication issue with the front passenger door module?

- Yes, the U1161 code can be cleared/reset using a diagnostic scan tool once the communication problem with the front passenger door module is fixed.

6. Is it safe to continue driving my Cadillac with the U1161 code related to lost communications with the front passenger door module?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure proper functionality of the front passenger door features.

7. How much does it typically cost to repair the U1161 code in a Cadillac caused by lost communications with the front passenger door module?

- Repair costs can vary depending on the exact cause of the communication loss, but they may range from a few hundred to a thousand dollars, including parts and labor.

8. Are there any common recalls or technical service bulletins related to the U1161 code in Cadillacs regarding the front passenger door module communication issue?

- It is advisable to check with a Cadillac dealership or online databases for any relevant recalls or technical service bulletins related to the U1161 code and front passenger door module communication problems.

9. Can a DIY enthusiast with basic automotive knowledge fix the U1161 code in a Cadillac on their own?

- Depending on the exact cause of the communication issue, some DIY enthusiasts may be able to address the problem by checking wiring and connections. However, complex issues may require professional assistance.

10. How long does it typically take to repair the U1161 code in a Cadillac resulting from lost communications with the front passenger door module?

- Repair times can vary based on the exact cause of the problem and the expertise of the technician, but resolving the U1161 code may take anywhere from a few hours to a full day in most cases.