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P173B MINI Code - CAN Engine Coolant Temperature Invalid

Quick Answer

The P173B MINI diagnostic trouble code indicates that the Engine Control Module (ECM) has detected an invalid engine coolant temperature signal over the Controller Area Network (CAN) bus. Common causes include Faulty engine coolant temperature sensor, Wiring or connector issues in the CAN bus network, ECM software or hardware malfunction. 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
P173B MINI indicates CAN Engine Coolant Temperature Invalid.
Common causes
Common causes include Faulty engine coolant temperature sensor, Wiring or connector issues in the CAN bus network, ECM software or hardware malfunction.
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 P173B MINI Description

The P173B MINI diagnostic trouble code indicates that the Engine Control Module (ECM) has detected an invalid engine coolant temperature signal over the Controller Area Network (CAN) bus. This means that the ECM is receiving data regarding the engine coolant temperature that does not match the expected values. This issue can affect the vehicle's performance by causing incorrect fuel mixture, ignition timing, and other engine parameters, leading to poor fuel economy, reduced power, and potential drivability issues. If left unaddressed, it can also cause long-term damage to the engine due to improper temperature regulation.

OBDII Code P173B MINI - CAN Engine Coolant Temperature Invalid
P173B MINI Code - CAN Engine Coolant Temperature Invalid

Common Causes of P173B MINI

  1. Faulty engine coolant temperature sensor
  2. Wiring or connector issues in the CAN bus network
  3. ECM software or hardware malfunction
  4. Low coolant level or coolant leaks
  5. Engine cooling system issues such as a malfunctioning thermostat

Symptoms of P173B MINI

  1. Engine overheating or running hotter than normal
  2. Engine stalling or rough idle
  3. Poor fuel efficiency
  4. Check Engine Light illuminated
  5. Inaccurate temperature gauge readings

How to Fix P173B MINI

  1. Perform a visual inspection of the engine cooling system, checking for any leaks or low coolant level.
  2. Test the engine coolant temperature sensor for proper operation using a multimeter.
  3. Inspect the wiring harness and connectors in the CAN bus network for any damage or corrosion.
  4. If necessary, replace the engine coolant temperature sensor and clear the fault code from the ECM.
  5. Perform a test drive to verify that the issue has been resolved and reset the ECM's adaptive memory.

Cost to Fix P173B MINI

The cost to repair a P173B MINI code can vary depending on the specific cause of the issue. On average, the parts for this repair, such as a new engine coolant temperature sensor, can range from $50 to $150. Labor costs at an auto repair shop can range from $100 to $300, depending on the shop's hourly rate and the complexity of the repair. It is recommended to get a detailed quote from a trusted mechanic to determine the exact cost for your vehicle.

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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 P173B MINI Code

1. What are the common symptoms of OBDII code P173B in a MINI related to engine coolant temperature?

The common symptoms include inaccurate temperature readings on the dashboard, engine overheating or running too cold, and potential engine performance issues.

2. What are the possible causes of OBDII code P173B indicating an invalid engine coolant temperature in a MINI?

Possible causes may include a faulty engine coolant temperature sensor, a problem with the wiring or connectors related to the sensor, or issues with the engine control module.

3. How can I diagnose the cause of OBDII code P173B related to an invalid engine coolant temperature in my MINI?

You can start by checking the engine coolant temperature sensor for proper operation, inspecting the wiring and connectors for any damage or loose connections, and using an OBDII scanner to read the live data and confirm the issue.

4. Can driving with OBDII code P173B indicating an invalid engine coolant temperature cause further damage to my MINI?

Continued driving with this code present can potentially lead to engine overheating, reduced fuel efficiency, and other performance issues, so it's best to address the problem promptly.

5. How can I reset OBDII code P173B in my MINI after repairing the issue with the engine coolant temperature?

You can typically reset the code using an OBDII scanner or by disconnecting the car's battery for a few minutes to clear the stored fault code.

6. Are there any DIY repair tips for addressing OBDII code P173B related to an invalid engine coolant temperature in a MINI?

DIY enthusiasts can attempt to replace the engine coolant temperature sensor themselves if they have the necessary tools and skills, following the manufacturer's guidelines.

7. Will OBDII code P173B prevent my MINI from passing an emissions test?

Yes, having this code stored in the vehicle's computer may cause it to fail an emissions test, so it's important to address the issue before undergoing testing.

8. How much can I expect to pay for professional repairs related to OBDII code P173B in a MINI?

The cost of repairs can vary depending on the specific cause of the issue, but you can expect to pay anywhere from $100 to $300 or more for parts and labor at a repair shop.

9. Can a faulty engine coolant temperature sensor trigger other OBDII codes along with P173B in a MINI?

Yes, a faulty sensor can sometimes trigger related codes such as P0116 (Engine Coolant Temperature Circuit Range/Performance) or P0117 (Engine Coolant Temperature Circuit Low Input).

10. Is it safe to continue driving my MINI with OBDII code P173B related to an invalid engine coolant temperature?

It's not recommended to drive the vehicle for an extended period with this issue, as it can lead to potential engine damage or other complications.

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