AutoCodes – Generic – P173B

P173B Code - CAN Engine Coolant Temperature Invalid

Quick Answer

The Engine Control Module (ECM) monitors the Engine Coolant Temperature Sensor. Common causes include Faulty Engine Coolant Temperature Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor circuit poor electrical connection. 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 indicates CAN Engine Coolant Temperature Invalid.
Common causes: Common causes include Faulty Engine Coolant Temperature Sensor, Engine Coolant Temperature Sensor harness is open or shorted, Engine Coolant Temperature Sensor circuit poor electrical connection.
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.

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Code Popularity 6,647

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jan 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P173B Description

The Engine Control Module (ECM) monitors the Engine Coolant Temperature Sensor. The ECM sets the OBDII code when the Engine Coolant Temperature Sensor is not to factory specifications.

OBDII Code P173B - CAN Engine Coolant Temperature Invalid - AutoCodes.com — P173B Code - CAN Engine Coolant Temperature Invalid

What does this mean?

What are the Possible Causes of the DTC P173B?

Faulty Engine Coolant Temperature Sensor
Engine Coolant Temperature Sensor harness is open or shorted
Engine Coolant Temperature Sensor circuit poor electrical connection

How to Fix the DTC P173B?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P173B code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P173B code?

Need more information on how to fix the P173B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P173B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P173B BMW — CAN Engine Coolant Temperature Invalid
P173B MINI — CAN Engine Coolant Temperature Invalid

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 Code

1. What are the common symptoms of OBDII code P173B (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?

Potential causes of this code include a faulty engine coolant temperature sensor, wiring issues, a malfunctioning powertrain control module (PCM), or a problem with the Controller Area Network (CAN) communication system.

3. How can I diagnose the cause of OBDII code P173B?

To diagnose the issue, you can use an OBDII scanner to read the code and check the engine coolant temperature sensor's readings. Inspecting the wiring connections and the CAN system for any faults can also help pinpoint the cause.

4. Is it safe to continue driving with OBDII code P173B active?

It is not recommended to drive with this code active, as inaccurate engine coolant temperature readings can lead to engine overheating and potential damage. It's best to address the issue promptly.

5. Can I repair OBDII code P173B myself?

If you have experience with automotive repairs and diagnostics, you may be able to address this code by replacing the faulty engine coolant temperature sensor or repairing any wiring issues. However, consulting a professional mechanic is recommended for accurate diagnosis and repair.

6. Will resetting the fault codes make OBDII code P173B disappear?

Resetting the fault codes may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and fix the root cause of the problem.

7. How much does it typically cost to repair OBDII code P173B?

The cost of repairing this code can vary depending on the cause of the issue, the labor rates in your area, and the parts needed for the repair. It's advisable to obtain quotes from local mechanics or repair shops.

8. Can a bad engine coolant temperature sensor cause OBDII code P173B?

Yes, a malfunctioning engine coolant temperature sensor is a common cause of this code. If the sensor is providing incorrect temperature readings to the PCM, it can trigger the P173B fault code.

9. Are there any temporary solutions for OBDII code P173B?

While there may be temporary fixes such as resetting the fault codes, it's crucial to address the underlying issue causing the code for a long-term solution. Ignoring the problem can lead to more severe engine issues.

10. How long does it take to repair OBDII code P173B?

The repair time for this code can vary depending on the cause of the issue and the complexity of the repair. It could range from a quick sensor replacement to a more extensive diagnostic process to identify and fix wiring or PCM problems.