AutoCodes – Generic – C2023

C2023 Code - Tire 3 Air Pressure Decrease

Quick Answer

The Tire Pressure Monitor (TPM) system checks the tire pressures of all 4 road wheels when the vehicle is driven at speeds above 25 mph (40 km/h), and warns in the event of a loss of pressure by means of a low tire pressure warning light. Common causes include Tire pressure not to factory specifications, Faulty Tire Pressure Transmitter, Faulty Tire Pressure Monitor System (TPMS) Control Module. 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: C2023 indicates Tire 3 Air Pressure Decrease.
Common causes: Common causes include Tire pressure not to factory specifications, Faulty Tire Pressure Transmitter, Faulty Tire Pressure Monitor System (TPMS) Control Module.
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 2,473

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Tech Notes
Cost to Diagnose
FAQs
Comments
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Code C2023 Description

The Tire Pressure Monitor (TPM) system checks the tire pressures of all 4 road wheels when the vehicle is driven at speeds above 25 mph (40 km/h), and warns in the event of a loss of pressure by means of a low tire pressure warning light. A sensor installed in each wheel will indicate when tire pressure is severely low. The TPM system will activate only when the vehicle is driven. The Tire Pressure Monitor System (TPMS) Control Module monitors the tire pressure at each wheel. The TPMS Control Module sets the OBDII code when the tire pressure signal is not to factory specifications.

OBDII Code C2023 - Tire 3 Air Pressure Decrease - AutoCodes.com — C2023 Code - Tire 3 Air Pressure Decrease

What does this mean?

What are the Possible Causes of the DTC C2023?

Tire pressure not to factory specifications
Faulty Tire Pressure Transmitter
Faulty Tire Pressure Monitor System (TPMS) Control Module

How to Fix the DTC C2023?

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 does this mean?

Code Tech Notes

When the low tire pressure warning light illuminates, immediately check the air pressure of all tires and adjust to the specified pressure. After adjusting air pressure, drive the vehicle at 25 mph (40 km/h) or more to start TPM system re-checking of the tire inflation pressures. Warning light should turn off in a few minutes.
If the warning light is still on after adjusting tire pressure, check for a damaged tire and repair as necessary. If warning light blinks 25 times and then illuminates, and there is not a tire without a tire pressure sensor installed, there is a malfunction in the TPM system. See appropriate manufacturer service information.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the C2023 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 C2023 code?

Need more information on how to fix the C2023 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C2023 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C2023 Subaru — Tire 3 Air Pressure Decrease

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 C2023 Code

1. What are common symptoms of OBDII code C2023 (Tire 3 Air Pressure Decrease)?

- The most common symptom is a warning light on the dashboard indicating low tire pressure in the third tire.

2. What are the possible causes of OBDII code C2023?

- The code C2023 typically indicates a decrease in air pressure in the third tire, which could be caused by a leak, a faulty tire pressure sensor, or improper tire maintenance.

3. How can I diagnose the cause of OBDII code C2023 myself?

- You can start by visually inspecting the third tire for any obvious signs of damage or leaks. You can also use a tire pressure gauge to check the actual pressure in the tire.

4. What should I do if I get OBDII code C2023?

- If you receive code C2023, it is important to address the issue promptly by checking the tire pressure in the third tire and addressing any potential leaks or sensor malfunctions.

5. Can I drive my vehicle with OBDII code C2023?

- It is generally safe to drive with the C2023 code, but it is crucial to address the low tire pressure issue as soon as possible to prevent potential safety hazards and damage to the tire.

6. Do I need to visit a mechanic for OBDII code C2023?

- While you can diagnose and address the issue yourself in some cases, if you are unsure or unable to fix the problem, it is recommended to consult a mechanic for professional assistance.

7. Are there any quick fixes for OBDII code C2023?

- Quick fixes may include inflating the affected tire to the recommended pressure, checking for and repairing any visible leaks, or resetting the tire pressure monitoring system.

8. How can I prevent OBDII code C2023 from happening again?

- Regularly checking and maintaining proper tire pressure, inspecting tires for damage, and ensuring tire pressure sensors are functioning correctly can help prevent the recurrence of code C2023.

9. Can weather conditions affect OBDII code C2023?

- Extreme temperatures, such as cold weather causing tire pressure to drop, can potentially trigger code C2023. Monitoring tire pressure regularly can help mitigate these effects.

10. Is it necessary to replace the tire if I get OBDII code C2023?

- In some cases, repairing a leak or replacing a faulty sensor may resolve the issue without needing to replace the tire. However, if the tire is damaged beyond repair, replacement may be necessary.