AutoCodes – Pontiac – U0073 Pontiac

U0073 Pontiac Code - Control Module Communication Bus OFF

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty CAN communication system, CAN System harness is open or shorted, CAN System 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: U0073 Pontiac indicates Control Module Communication Bus OFF.
Common causes: Common causes include Faulty CAN communication system, CAN System harness is open or shorted, CAN System 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 17,387

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 Mar 29, 2020

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0073 Pontiac Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module.

OBDII Code U0073 Pontiac - Control Module Communication Bus OFF - AutoCodes.com — U0073 Pontiac Code - Control Module Communication Bus OFF

What does this mean?

What are the Possible Causes of the DTC U0073 Pontiac?

Faulty CAN communication system
CAN System harness is open or shorted
CAN System circuit poor electrical connection

How to Fix the DTC U0073 Pontiac?

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 U0073 Pontiac 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 U0073 Pontiac Code

1. What does the OBDII code U0073 on a Pontiac mean?

The code U0073 indicates a communication bus OFF error related to the control module in your Pontiac.

2. What are the common symptoms of U0073 in a Pontiac?

Common symptoms of the U0073 code may include dashboard warning lights, loss of communication with various control modules, and issues with vehicle systems like power steering or transmission.

3. What are the possible causes of the U0073 code in a Pontiac?

Possible causes of the U0073 code include damaged wiring, faulty control modules, software issues, loose connections, or a malfunctioning communication network.

4. How can I diagnose the U0073 code in my Pontiac?

Diagnosing the U0073 code involves using an OBDII scanner to retrieve the error code, checking the communication network for faults, inspecting wiring and connections, and testing control modules for proper function.

5. Can I continue to drive my Pontiac with the U0073 code present?

It is not recommended to drive your Pontiac with the U0073 code present, as it can lead to potential safety hazards and further damage to vehicle systems.

6. How can I repair the U0073 code in my Pontiac?

Repairing the U0073 code typically involves addressing the root cause of the communication bus OFF error, which may include repairing or replacing damaged wiring, fixing loose connections, or replacing faulty control modules.

7. Will resetting the U0073 code make it go away permanently?

Resetting the U0073 code may temporarily clear the error, but if the underlying issue is not addressed, the code is likely to reappear once the vehicle is driven again.

8. Can a DIY enthusiast fix the U0073 code in a Pontiac?

DIY enthusiasts with the necessary tools and knowledge of automotive systems may be able to diagnose and repair the U0073 code, but it is recommended to seek professional help for complex electrical issues.

9. How much does it cost to fix the U0073 code in a Pontiac?

The cost of fixing the U0073 code in a Pontiac can vary depending on the specific cause of the issue, the extent of repairs needed, and whether you choose to do the repairs yourself or seek help from a mechanic.

10. Is the U0073 code a common problem in Pontiac vehicles?

The U0073 code related to control module communication bus OFF can be encountered in various Pontiac models, especially in older vehicles or those with underlying electrical issues.