AutoCodes – Buick – U1073 Buick

U1073 Buick Code - Invalid Or Missing Data For Engine Coolant

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Coolant Sensor, Engine Coolant Sensor harness is open or shorted, Engine Coolant Sensor 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: U1073 Buick indicates Invalid Or Missing Data For Engine Coolant.
Common causes: Common causes include Faulty Engine Coolant Sensor, Engine Coolant Sensor harness is open or shorted, Engine Coolant Sensor 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 546

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 22, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code U1073 Buick 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) U1073 is set.

OBDII Code U1073 Buick - Invalid Or Missing Data For Engine Coolant - AutoCodes.com — U1073 Buick Code - Invalid Or Missing Data For Engine Coolant

What does this mean?

What are the Possible Causes of the DTC U1073 Buick?

Faulty Engine Coolant Sensor
Engine Coolant Sensor harness is open or shorted
Engine Coolant Sensor circuit poor electrical connection

How to Fix the DTC U1073 Buick?

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 does this mean?

Code Tech Notes

This is typically an electrical wiring connection issue, either at the engine controller or at the sensors being monitored by the manufacturer.
It can occur if:
Someone changes a battery while the ignition switch is left on, that is, left in the RUN position.
Someone flashes/upgrades their engine controller - other modules unable to communicate with PCM during this process - this will set U1073 at a multitude of controllers on the vehicle - all false codes. Erase and carry on.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the U1073 Buick 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 U1073 Buick Code

What does the OBDII code U1073 mean on a Buick?

Code U1073 indicates that the vehicle's control module has detected invalid or missing data related to the engine coolant system.

What are common symptoms of code U1073 on a Buick?

Common symptoms include an illuminated Check Engine Light, overheating issues, erratic temperature gauge readings, and poor engine performance.

What causes the U1073 code to appear on a Buick?

Causes include a faulty engine coolant temperature sensor, damaged wiring or connectors, software issues in the control module, or a network communication failure between modules.

How can I diagnose code U1073 on my Buick?

Start by checking the engine coolant temperature sensor, inspecting wiring and connectors for damage, and scanning for additional codes to identify potential communication errors.

Can code U1073 cause engine damage if ignored?

Yes, ignoring this code can lead to overheating issues, which may cause severe engine damage if not addressed promptly.

How do I fix the U1073 code on a Buick?

Repairs may involve replacing a faulty coolant temperature sensor, repairing damaged wiring, updating module software, or addressing network communication issues.

Can a low coolant level trigger code U1073?

Low coolant levels typically wonâ€™t directly trigger U1073, but they can cause related issues, so itâ€™s important to check and correct the coolant level as part of the troubleshooting process.

Is code U1073 specific to certain Buick models?

No, U1073 is a generic communication code that can appear on various Buick models equipped with OBDII systems.

Can driving with code U1073 damage my Buick?

Driving with this code can lead to overheating or other engine performance issues, so itâ€™s best to address it as soon as possible.

Do I need special tools to fix code U1073 on a Buick?

A professional OBDII scanner and a multimeter are helpful for diagnosing and repairing this code, but complex issues may require assistance from a qualified technician.