AutoCodes – Generic – U1171

U1171 Code - Invalid Or Missing Data For Cellular Phone / Paging System

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Module that is not communicating, Module harness is open or shorted, 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: U1171 indicates Invalid Or Missing Data For Cellular Phone / Paging System.
Common causes: Common causes include Faulty Module that is not communicating, Module harness is open or shorted, 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 4,122

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 U1171 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 State of Health monitoring. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. When a module does not associate an identification number with at least one critical parameter within 5 seconds of beginning serial data communication, the Diagnostic Trouble Code (DTC) is set.

OBDII Code U1171 - Invalid Or Missing Data For Cellular Phone / Paging System - AutoCodes.com — U1171 Code - Invalid Or Missing Data For Cellular Phone / Paging System

What does this mean?

What are the Possible Causes of the DTC U1171?

Faulty Module that is not communicating
Module harness is open or shorted
Module circuit poor electrical connection

How to Fix the DTC U1171?

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 U1171 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 U1171 Code

What does OBDII code U1171 mean?

Code U1171 indicates that the vehicle's system has detected invalid or missing data related to the cellular phone or paging system communication module.

What are common symptoms of code U1171?

Symptoms may include the inability to use cellular or paging features, warning lights on the dashboard, or issues with the vehicle's communication systems.

What causes code U1171 to appear?

Common causes include faults in the cellular phone or paging system module, damaged wiring or connectors, or issues with the vehicle's communication network.

Can code U1171 affect vehicle performance?

Typically, U1171 does not affect core vehicle performance but may impact connectivity features, such as hands-free calling or emergency communication systems.

How can I diagnose code U1171?

Use an OBDII scanner to confirm the code, and then inspect the cellular phone or paging system module, wiring, and connectors for damage or faults.

What repairs can fix code U1171?

Repairs may include replacing or reprogramming the communication module, repairing or replacing damaged wiring, or clearing the code after resolving the issue.

Is code U1171 specific to certain vehicle makes or models?

U1171 may be more common in vehicles equipped with advanced communication systems, but it can appear in various makes and models that use cellular or paging features.

How can I prevent code U1171 from recurring?

Regular maintenance of the vehicle's communication system, including inspection of wiring and connectors, can help prevent issues leading to U1171.

Do I need a professional to fix code U1171?

While some issues like inspecting wiring can be done by the vehicle owner, diagnosing and repairing communication module faults may require professional assistance.

Can I clear code U1171 without fixing the problem?

Clearing the code without addressing the underlying issue will likely cause it to return, as the fault remains unresolved.