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P173B BMW Code - CAN Engine Coolant Temperature Invalid

Quick Answer

The P173B BMW code indicates that the Engine Control Module (ECM) has detected an invalid engine coolant temperature reading on the Controller Area Network (CAN) bus. Common causes include Faulty engine coolant temperature sensor, Wiring or connection issues in the CAN bus network, ECM software glitch. 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 BMW indicates CAN Engine Coolant Temperature Invalid.
Common causes
Common causes include Faulty engine coolant temperature sensor, Wiring or connection issues in the CAN bus network, ECM software glitch.
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 18, 2024
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Code P173B BMW Description

The P173B BMW code indicates that the Engine Control Module (ECM) has detected an invalid engine coolant temperature reading on the Controller Area Network (CAN) bus. The ECM relies on accurate coolant temperature data to regulate fuel injection timing, engine timing, and other critical functions. When the ECM receives an incorrect or inconsistent temperature reading, it can lead to poor engine performance, decreased fuel efficiency, and potential engine damage if not addressed promptly.

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

Common Causes of P173B BMW

  1. Faulty engine coolant temperature sensor
  2. Wiring or connection issues in the CAN bus network
  3. ECM software glitch
  4. Low coolant levels or air pockets in the cooling system
  5. Cooling system malfunction or blockage

Symptoms of P173B BMW

  1. Engine overheating or running hotter than usual
  2. Poor fuel efficiency
  3. Rough idling or stalling
  4. Check engine light illuminated on the dashboard
  5. Decreased engine performance

How to Fix P173B BMW

  1. Begin by checking the coolant level and ensuring there are no leaks in the cooling system.
  2. Inspect the engine coolant temperature sensor for any signs of damage or corrosion. Replace if necessary.
  3. Check the wiring and connections in the CAN bus network for any loose or damaged components.
  4. Reset the ECM and clear the diagnostic trouble codes. Test drive the vehicle to confirm the issue has been resolved.
  5. If the problem persists, consider seeking professional help to diagnose and repair any underlying issues with the cooling system or ECM.

Cost to Fix P173B BMW

The cost of repairing a CAN Engine Coolant Temperature Invalid issue can vary depending on the specific cause of the problem. In general, replacing a faulty engine coolant temperature sensor can cost between $50 and $150, while addressing wiring or connection issues may require additional labor charges. Overall, the total repair cost for this issue could range from $100 to $300, excluding diagnostic fees. It's recommended to consult with a qualified mechanic to receive an accurate cost estimate based on your vehicle's make and model.

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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 BMW Code

1. What are the common symptoms of OBDII code P173B in a BMW related to CAN Engine Coolant Temperature Invalid?

The common symptoms include inaccurate temperature readings on the dashboard, engine overheating, and potential issues with the vehicle's performance.

2. What are the possible causes of OBDII code P173B in a BMW indicating CAN Engine Coolant Temperature Invalid?

The code can be triggered by a faulty engine coolant temperature sensor, wiring or connection issues, a malfunctioning CAN communication system, or a problem with the engine control module.

3. How can I diagnose the cause of OBDII code P173B in my BMW related to CAN Engine Coolant Temperature Invalid?

Diagnosing the issue typically involves checking the coolant temperature sensor for proper operation, inspecting the wiring and connections for any damage, and scanning the CAN communication system for faults using a diagnostic tool.

4. What are some repair tips for resolving OBDII code P173B in a BMW linked to CAN Engine Coolant Temperature Invalid?

Repair tips may include replacing the faulty engine coolant temperature sensor, repairing any damaged wiring or connections, addressing issues with the CAN communication system, and resetting the fault code using a diagnostic tool.

5. Can driving with OBDII code P173B in a BMW indicating CAN Engine Coolant Temperature Invalid cause further damage to the vehicle?

Continuing to drive with this fault code may lead to engine overheating, potential damage to engine components, and compromised vehicle performance. It is advisable to address the issue promptly.

6. How important is it to fix OBDII code P173B in a BMW related to CAN Engine Coolant Temperature Invalid?

Fixing this code is crucial to ensure accurate temperature readings, prevent engine overheating, maintain optimal engine performance, and avoid potential long-term damage to the vehicle.

7. Is it possible to reset OBDII code P173B in a BMW tied to CAN Engine Coolant Temperature Invalid without addressing the underlying issue?

While you can reset the fault code using a diagnostic tool, it is essential to address the root cause of the problem to prevent the code from reoccurring and potentially causing further issues.

8. Can a DIY enthusiast with some automotive knowledge repair OBDII code P173B in a BMW associated with CAN Engine Coolant Temperature Invalid?

Depending on the specific cause of the issue, some DIY enthusiasts may be able to address the problem by replacing the coolant temperature sensor or checking for wiring issues. However, complex CAN communication system problems may require professional assistance.

9. Are there any preventive measures to avoid encountering OBDII code P173B in a BMW related to CAN Engine Coolant Temperature Invalid?

Regular maintenance, such as checking coolant levels, inspecting sensors for signs of wear, and addressing any warning signs promptly, can help prevent issues that lead to this fault code.

10. How long does it typically take to repair OBDII code P173B in a BMW indicating CAN Engine Coolant Temperature Invalid?

The repair time can vary depending on the specific cause of the issue, the availability of parts, and the expertise of the technician. Simple repairs like sensor replacement may take a short time, while diagnosing complex CAN communication system problems may require more time.

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