AutoCodes – Generic – U1073

U1073 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 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 42,064

How popular is this code, among other codes? Medium

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

What does this mean?

What are the Possible Causes of the DTC U1073?

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?

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 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.

Need more information about the U1073 code?

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Need Help with the Code?

Get the U1073 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U1073 Buick — Invalid Or Missing Data For Engine Coolant
U1073 Cadillac — Invalid Or Missing Data For Engine Coolant
U1073 Chevrolet — Invalid Or Missing Data For Engine Coolant
U1073 Ford — Invalid Or Missing Data For Engine Coolant
U1073 GMC — Invalid Or Missing Data For Engine Coolant
U1073 Lincoln — Invalid Or Missing Data For Engine Coolant
U1073 Mercury — Invalid Or Missing Data For Engine Coolant

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 Code

1. What are common symptoms of OBDII code U1073 (Invalid Or Missing Data For Engine Coolant)?

- Common symptoms include engine overheating, erratic temperature gauge readings, and poor fuel efficiency.

2. What are some possible causes of OBDII code U1073?

- Possible causes include a malfunctioning engine coolant temperature sensor, wiring issues, a faulty powertrain control module (PCM), or low coolant levels.

3. How can I diagnose the cause of OBDII code U1073?

- Use a diagnostic scanner to retrieve the freeze frame data and any related codes. Check the engine coolant temperature sensor and associated wiring for damage or corrosion. Test the sensor's resistance and compare it to specifications.

4. Can driving with OBDII code U1073 cause further damage to my vehicle?

- Driving with this code may lead to engine overheating, which can cause serious damage to engine components. It is recommended to address the issue promptly.

5. What are some repair tips for addressing OBDII code U1073?

- Start by checking the coolant level and topping it off if necessary. Inspect the engine coolant temperature sensor and replace it if faulty. Ensure all wiring connections related to the sensor are secure and free of corrosion.

6. Is it safe to continue driving my vehicle with OBDII code U1073?

- It is not recommended to drive the vehicle with this code present, as it can lead to engine overheating and potential damage. It is best to address the issue before driving the vehicle again.

7. Can a DIY enthusiast fix OBDII code U1073 at home?

- Depending on the underlying cause, a DIY enthusiast with the necessary tools and knowledge may be able to fix this code at home by replacing the engine coolant temperature sensor or addressing wiring issues.

8. Will resetting the OBDII system clear code U1073?

- Resetting the OBDII system may temporarily clear the code, but it will likely return if the underlying issue is not addressed. It is recommended to diagnose and repair the root cause of the code.

9. How much does it typically cost to repair OBDII code U1073 at a mechanic or dealership?

- The cost of repairing this code can vary depending on the cause and location. On average, it may cost between $100 to $300 for parts and labor at a mechanic or dealership.

10. Are there any preventative maintenance measures to avoid OBDII code U1073 in the future?

- Regularly checking coolant levels, performing cooling system flushes as recommended by the manufacturer, and addressing any issues with the engine coolant temperature sensor promptly can help prevent OBDII code U1073 in the future.