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Engine-Codes – Mercury – U1073 Mercury

U1073 Mercury Code - Invalid Or Missing Data For Engine Coolant

Quick Answer

The U1073 diagnostic trouble code (DTC) for Mercury vehicles indicates that there is invalid or missing data for engine coolant. Common causes include Faulty coolant temperature sensor: A malfunctioning coolant temperature sensor can send incorrect data to the ECM or PCM, Wiring issues: Damaged or corroded wiring connected to the coolant temperature sensor can disrupt the signal transmission, Faulty ECM or PCM: If the engine control module is faulty, it may not be able to receive or process coolant temperature data correctly. 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 Mercury 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 or PCM, Wiring issues: Damaged or corroded wiring connected to the coolant temperature sensor can disrupt the signal transmission, Faulty ECM or PCM: If the engine control module is faulty, it may not be able to receive or process coolant temperature data correctly.
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 08, 2024
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Code U1073 Mercury Description

The U1073 diagnostic trouble code (DTC) for Mercury vehicles indicates that there is invalid or missing data for engine coolant. This means that the Engine Control Module (ECM) or Powertrain Control Module (PCM) is not receiving the necessary information regarding the engine coolant temperature. Engine coolant temperature is crucial for the proper functioning of the engine, as it helps regulate the engine temperature and ensures optimal performance. When the ECM or PCM does not receive accurate data on engine coolant temperature, it can lead to a variety of issues that can affect the vehicle's performance and potentially cause long-term damage if not addressed promptly.

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

Common Causes of U1073 Mercury

  1. Faulty coolant temperature sensor: A malfunctioning coolant temperature sensor can send incorrect data to the ECM or PCM.
  2. Wiring issues: Damaged or corroded wiring connected to the coolant temperature sensor can disrupt the signal transmission.
  3. Faulty ECM or PCM: If the engine control module is faulty, it may not be able to receive or process coolant temperature data correctly.
  4. Software issues: Software glitches within the ECM or PCM can cause communication errors and trigger the U1073 code.

Symptoms of U1073 Mercury

  1. Engine overheating: Without accurate data on engine coolant temperature, the engine may overheat, leading to potential damage.
  2. Poor fuel economy: Incorrect engine coolant temperature readings can cause the engine to run inefficiently, resulting in decreased fuel economy.
  3. Rough idling: The engine may idle roughly or inconsistently if the ECM or PCM is receiving incorrect coolant temperature data.
  4. Illuminated Check Engine Light: The U1073 code will trigger the Check Engine Light to illuminate on the dashboard, signaling a problem that needs to be addressed.

How to Fix U1073 Mercury

  1. Check coolant temperature sensor: The first step is to inspect the coolant temperature sensor for any signs of damage or malfunction. If necessary, replace the sensor.
  2. Check wiring: Inspect the wiring connected to the coolant temperature sensor for any damage or corrosion. Repair or replace any faulty wiring.
  3. Check ECM/PCM: Test the engine control module or powertrain control module to ensure it is functioning properly. Replace if necessary.
  4. Clear codes: After completing the repairs, clear the U1073 code from the ECM or PCM to reset the Check Engine Light.

Cost to Fix U1073 Mercury

The cost of repairing the U1073 code for invalid or missing data for engine coolant can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a coolant temperature sensor ranges from $50 to $150, while diagnosing and repairing wiring issues can cost between $100 and $300. If the ECM or PCM needs to be replaced, the cost can range from $500 to $1000 or more. Additionally, labor costs at auto repair shops typically range from $80 to $150 per hour. It is advisable to consult with a professional mechanic for a more accurate cost estimate based on your vehicle's make and model.

What does this mean?

Tech Notes for U1073 Mercury

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 Mercury Code

1. What are the common symptoms of OBDII code U1073 in a Mercury vehicle?

- Common symptoms include engine overheating, erratic temperature gauge readings, and potential stalling or rough idle.

2. What can cause the OBDII code U1073 related to invalid or missing data for engine coolant in a Mercury?

- Possible causes may include a faulty engine coolant temperature sensor, issues with the coolant system, wiring problems, or a malfunctioning powertrain control module (PCM).

3. How can I diagnose the OBDII code U1073 in my Mercury vehicle?

- Diagnosing this code typically involves checking the engine coolant level, inspecting the coolant temperature sensor and its wiring, and using a diagnostic scanner to read live data from the PCM.

4. Can driving with the OBDII code U1073 in a Mercury cause further damage to the vehicle?

- Driving with this code may lead to engine overheating, which can potentially cause severe damage to the engine if not addressed promptly.

5. What are some repair tips for fixing the OBDII code U1073 in a Mercury?

- Repair tips may include replacing the engine coolant temperature sensor, checking and refilling the coolant level, inspecting and repairing any damaged wiring, and resetting the fault code with a diagnostic scanner after repairs.

6. Is it safe to continue driving my Mercury with the U1073 code if the engine coolant temperature seems normal?

- It is not recommended to continue driving with this code present, as there may be underlying issues affecting the engine coolant system that could lead to potential problems.

7. How much does it typically cost to repair the OBDII code U1073 in a Mercury?

- The cost of repair can vary depending on the root cause of the issue, but it may range from $100 to $300 for parts and labor.

8. Can a DIY enthusiast with basic automotive knowledge fix the OBDII code U1073 issue in a Mercury?

- Depending on the exact cause of the problem, some DIY enthusiasts may be able to address this issue by replacing the coolant temperature sensor or checking for wiring issues.

9. Will resetting the OBDII code U1073 in a Mercury make the issue go away permanently?

- Resetting the code may temporarily clear the fault, but if the underlying issue causing the code is not resolved, it is likely to reoccur.

10. How urgent is it to address the OBDII code U1073 in a Mercury once it appears?

- It is best to address this issue promptly to prevent potential engine damage and ensure the proper functioning of the engine coolant system.

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