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U1073 Chevrolet Code - Invalid Or Missing Data For Engine Coolant

Quick Answer

The U1073 code for Chevrolet vehicles indicates that there is invalid or missing data for the engine coolant system. Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Wiring issues or connections related to the ECT sensor, Low coolant levels or coolant leaks. 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 Chevrolet indicates Invalid Or Missing Data For Engine Coolant.
Common causes
Common causes include Faulty Engine Coolant Temperature (ECT) sensor, Wiring issues or connections related to the ECT sensor, Low coolant levels or coolant leaks.
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.
What is this?
Table of contents Created and updated by William Orellana on Aug 30, 2024
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Code U1073 Chevrolet Description

The U1073 code for Chevrolet vehicles indicates that there is invalid or missing data for the engine coolant system. This means that the Engine Control Module (ECM) is not receiving the necessary information about the coolant temperature, which is crucial for the engine's performance and efficiency. The engine coolant system is responsible for maintaining the engine at the optimal operating temperature, ensuring proper combustion and preventing overheating. Without accurate data on coolant temperature, the ECM may not be able to adjust fuel delivery and ignition timing correctly, leading to poor performance, reduced fuel efficiency, and potential engine damage.

OBDII Code U1073 Chevrolet - Invalid Or Missing Data For Engine Coolant
U1073 Chevrolet Code - Invalid Or Missing Data For Engine Coolant

Common Causes of U1073 Chevrolet

  1. Faulty Engine Coolant Temperature (ECT) sensor
  2. Wiring issues or connections related to the ECT sensor
  3. Low coolant levels or coolant leaks
  4. ECM software or hardware malfunction
  5. Cooling system blockages or restrictions

Symptoms of U1073 Chevrolet

  1. Engine overheating
  2. Fluctuating or inaccurate temperature gauge readings
  3. Poor fuel economy
  4. Engine misfires or rough idling
  5. Check Engine Light illuminated

How to Fix U1073 Chevrolet

  1. Begin by checking the coolant level and topping it off if necessary.
  2. Inspect the ECT sensor and its wiring for any damage or corrosion. Replace the sensor if faulty.
  3. Clear the diagnostic trouble codes and reset the ECM to see if the issue persists.
  4. Perform a cooling system flush to remove any blockages or contaminants.
  5. Test drive the vehicle to ensure that the issue has been resolved and monitor coolant temperature readings.

Cost to Fix U1073 Chevrolet

The typical repair costs for addressing the U1073 code on a Chevrolet vehicle can vary depending on the specific cause of the issue. In general, replacing an ECT sensor can cost between $50 and $150, while addressing wiring or coolant system issues may range from $100 to $500 or more. Additionally, labor costs can add to the total repair bill, with hourly rates typically ranging from $80 to $150. It's advisable to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on the specific circumstances of your vehicle.

What does this mean?

Tech Notes for U1073 Chevrolet

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.

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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 Chevrolet Code

1. What does the OBDII code U1073 mean on a Chevrolet?

U1073 indicates "Invalid or Missing Data for Engine Coolant," meaning the vehicle's control module isn't receiving proper data from the engine coolant sensor or related components.

2. What are common symptoms of the U1073 code in a Chevrolet?

Symptoms may include erratic engine temperature readings, poor fuel economy, engine overheating, or the check engine light illuminating.

3. What causes the U1073 code on a Chevrolet?

Common causes include a faulty engine coolant temperature (ECT) sensor, damaged wiring or connectors, a malfunctioning control module, or network communication issues in the vehicle's data bus.

4. Can I drive my Chevrolet with the U1073 code active?

It's not recommended to drive with this code active, as inaccurate coolant temperature readings can lead to engine overheating or inefficient performance.

5. How do I diagnose the U1073 code on a Chevrolet?

Start by scanning the vehicle for additional codes, inspecting the ECT sensor and its wiring for damage, and checking the data communication network for faults.

6. How do I fix the U1073 code on my Chevrolet?

Repairs may involve replacing the ECT sensor, repairing damaged wiring or connectors, or updating or reprogramming the vehicle's control module.

7. Can a bad thermostat trigger the U1073 code on a Chevrolet?

While unlikely, a malfunctioning thermostat causing erratic coolant flow could indirectly affect the ECT sensor readings and contribute to the issue.

8. Is the U1073 code related to the CAN bus system on a Chevrolet?

Yes, U1073 is a communication-related code that could stem from a fault in the vehicle's Controller Area Network (CAN) bus system.

9. How much does it cost to repair the U1073 code on a Chevrolet?

Repair costs vary depending on the cause, but replacing an ECT sensor typically costs $150-$300, while addressing wiring or module issues may cost more.

10. Can a low coolant level cause the U1073 code on a Chevrolet?

Low coolant levels can cause inaccurate readings from the ECT sensor, which might contribute to the U1073 code. Always ensure the coolant is at the proper level.

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