AutoCodes – Cadillac – U1073 Cadillac

U1073 Cadillac 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 Cadillac 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 628

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 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) U1073 is set.

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

What does this mean?

What are the Possible Causes of the DTC U1073 Cadillac?

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 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 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 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 U1073 Cadillac Code

1. What does OBDII code U1073 mean on a Cadillac?

Code U1073 indicates "Invalid or Missing Data for Engine Coolant," meaning the engine control module (ECM) is not receiving accurate or complete data from the coolant temperature sensor or related systems.

2. What are the common symptoms of code U1073 on a Cadillac?

Symptoms may include an illuminated check engine light, erratic engine temperature readings, poor fuel economy, engine overheating, or reduced engine performance.

3. What causes code U1073 on a Cadillac?

Common causes include a faulty engine coolant temperature sensor, damaged wiring or connectors, a malfunctioning ECM, or network communication issues within the vehicle's data bus.

4. Can code U1073 cause engine damage if ignored?

Yes, ignoring code U1073 could lead to improper engine cooling, which may cause overheating and potentially serious engine damage.

5. How do you diagnose code U1073 on a Cadillac?

Diagnosis involves checking the coolant temperature sensor, inspecting wiring and connectors for damage or corrosion, and using a scan tool to monitor data communication between modules.

6. Can a loose connector cause code U1073?

Yes, a loose or corroded connector in the coolant temperature sensor circuit can disrupt data transfer and trigger code U1073.

7. How do you fix code U1073 on a Cadillac?

Repairs may include replacing the coolant temperature sensor, repairing or replacing damaged wiring, cleaning or securing connectors, or reprogramming or replacing the ECM if necessary.

8. Is it safe to drive with code U1073 on my Cadillac?

Driving with this code is not recommended, as it can lead to overheating or erratic engine performance, potentially causing more significant issues.

9. Can low coolant levels trigger code U1073?

Low coolant levels are not a direct cause of U1073, but they can lead to overheating, which may contribute to related sensor issues.

10. Will clearing the code U1073 with a scan tool fix the problem?

Clearing the code may temporarily turn off the check engine light, but it won't address the underlying issue. The problem must be properly diagnosed and repaired to prevent the code from returning.