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Engine-Codes – GMC – U1073 GMC

U1073 GMC Code - Invalid Or Missing Data For Engine Coolant

Quick Answer

The U1073 diagnostic trouble code (DTC) for GMC vehicles indicates that there is invalid or missing data for the engine coolant system. Common causes include Faulty coolant temperature sensor: A malfunctioning coolant temperature sensor can send incorrect data to the ECM, triggering the U1073 code, Wiring issues: Corroded or damaged wiring connections between the coolant temperature sensor and the ECM can cause communication errors, ECM or BCM malfunction: A malfunction in the ECM or BCM can also lead to communication errors related to engine coolant data. 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 GMC indicates Invalid Or Missing Data For Engine Coolant.
Common causes
Common causes include Faulty coolant temperature sensor: A malfunctioning coolant temperature sensor can send incorrect data to the ECM, triggering the U1073 code, Wiring issues: Corroded or damaged wiring connections between the coolant temperature sensor and the ECM can cause communication errors, ECM or BCM malfunction: A malfunction in the ECM or BCM can also lead to communication errors related to engine coolant data.
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 Sep 10, 2024
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Code U1073 GMC Description

The U1073 diagnostic trouble code (DTC) for GMC vehicles indicates that there is invalid or missing data for the engine coolant system. This code typically points to a communication error between the Engine Control Module (ECM) and the Body Control Module (BCM) or other relevant sensors. The engine coolant system is crucial for maintaining the engine's operating temperature within an optimal range, ensuring proper performance and preventing overheating. When there is invalid or missing data for engine coolant, it can lead to various issues that affect the vehicle's overall performance and efficiency.

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

Common Causes of U1073 GMC

  1. Faulty coolant temperature sensor: A malfunctioning coolant temperature sensor can send incorrect data to the ECM, triggering the U1073 code.
  2. Wiring issues: Corroded or damaged wiring connections between the coolant temperature sensor and the ECM can cause communication errors.
  3. ECM or BCM malfunction: A malfunction in the ECM or BCM can also lead to communication errors related to engine coolant data.
  4. Low coolant level: Insufficient coolant in the system can also trigger the U1073 code, as the sensor may not be able to accurately measure the coolant temperature.

Symptoms of U1073 GMC

  1. Engine overheating: One of the most common symptoms associated with the U1073 code is engine overheating. Without accurate data on engine coolant temperature, the ECM may not be able to activate the cooling system components, leading to overheating.
  2. Poor fuel efficiency: A malfunction in the engine coolant system can also result in poor fuel efficiency, as the ECM may not be able to adjust the fuel delivery accurately based on engine temperature.
  3. Rough idling or stalling: Invalid data for engine coolant can cause the engine to run erratically, leading to rough idling or even stalling.
  4. Check engine light: The U1073 DTC will trigger the check engine light to illuminate on the dashboard, indicating a problem with the engine coolant system.

How to Fix U1073 GMC

  1. Diagnose the issue: Use a diagnostic scanner to retrieve the specific trouble code and pinpoint the source of the problem, whether it's a faulty sensor, wiring issue, or ECM malfunction.
  2. Inspect coolant system: Check the coolant level and quality, ensuring that there are no leaks or other issues affecting the system.
  3. Replace coolant temperature sensor: If the sensor is faulty, replace it with a new one to ensure accurate data transmission to the ECM.
  4. Repair wiring connections: Address any corroded or damaged wiring connections between the sensor and the ECM to restore proper communication.
  5. Reset ECM: Clear the trouble code and reset the ECM to ensure that the issue has been resolved before test-driving the vehicle.

Cost to Fix U1073 GMC

The cost of repairing the U1073 code for GMC vehicles can vary depending on the specific cause of the issue. In general, replacing a coolant temperature sensor can cost between $50 and $150, while addressing wiring issues or ECM malfunctions may require additional labor and parts. The total repair cost, including parts and labor, can range from $100 to $500 or more. It's important to consider the specific diagnosis time and labor rates at auto repair shops, as these can impact the overall cost of resolving the U1073 code.

What does this mean?

Tech Notes for U1073 GMC

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 GMC Code

1. What are the common symptoms of OBDII code U1073 GMC?

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

2. What are the possible causes of OBDII code U1073 GMC?

- The code can be triggered by issues such as a faulty engine coolant temperature sensor, damaged wiring or connectors, low coolant levels, or a malfunctioning engine control module (ECM).

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

- Diagnose the code by checking the coolant level, inspecting the temperature sensor and its connections, testing the ECM, and scanning for any other related codes to pinpoint the issue.

4. Can I continue driving with OBDII code U1073 GMC active?

- It is not recommended to drive with this code active, as it can lead to engine damage or overheating. It's best to address the underlying issue promptly.

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

- Repair tips include checking and topping up coolant levels, testing and replacing the coolant temperature sensor, repairing any damaged wiring, and resetting the ECM after repairs.

6. How much does it typically cost to fix OBDII code U1073 GMC?

- The cost of fixing this code can vary depending on the underlying issue. Repairs may range from a simple sensor replacement (around $50-$200) to more complex wiring or ECM repairs ($200-$500+).

7. Can a DIY enthusiast fix OBDII code U1073 GMC themselves?

- Depending on their skill level, DIY enthusiasts can attempt to fix this code by following repair guides, using diagnostic tools, and performing basic checks. However, more complex issues may require professional help.

8. Are there any preventive measures to avoid OBDII code U1073 GMC in the future?

- Regularly check coolant levels, inspect the cooling system for leaks or damage, perform routine maintenance on the temperature sensor, and address any warning signs promptly to prevent this code from reoccurring.

9. Will resetting the OBDII code U1073 GMC make it go away permanently?

- Resetting the code may temporarily clear the error, but if the underlying issue is not addressed, it is likely to trigger the code again. It's crucial to diagnose and repair the root cause for a permanent fix.

10. Is OBDII code U1073 GMC specific to GMC vehicles only?

- While the code designation may mention GMC, OBDII code U1073 related to engine coolant issues can be found in various vehicle makes and models, not exclusive to GMC vehicles.

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