AutoCodes – Generic – P123B

P123B Code - BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation

Quick Answer

The Powertrain Control Module (PCM) monitors the Barometric Pressure (BARO) Sensor and Turbocharger (TC) / Supercharger (SC) Boost Pressure Sensor 'B'. Common causes include Faulty Barometric Pressure (BARO) Sensor, Barometric Pressure (BARO) Sensor harness is open or shorted, Barometric Pressure (BARO) 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: P123B indicates BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation.
Common causes: Common causes include Faulty Barometric Pressure (BARO) Sensor, Barometric Pressure (BARO) Sensor harness is open or shorted, Barometric Pressure (BARO) 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 5,663

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 Sep 02, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P123B Description

The Powertrain Control Module (PCM) monitors the Barometric Pressure (BARO) Sensor and Turbocharger (TC) / Supercharger (SC) Boost Pressure Sensor 'B'. The PCM sets the OBDII code when the Barometric Pressure (BARO) Sensor and Turbocharger (TC) / Supercharger (SC) Boost Pressure Sensor 'B' is not to factory specifications.

OBDII Code P123B - BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation - AutoCodes.com — P123B Code - BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation

What does this mean?

What are the Possible Causes of the DTC P123B?

Faulty Barometric Pressure (BARO) Sensor
Barometric Pressure (BARO) Sensor harness is open or shorted
Barometric Pressure (BARO) Sensor circuit poor electrical connection
Faulty Supercharger (SC) Boost Pressure Sensor 'A'
Supercharger (SC) Boost Pressure Sensor 'A' harness is open or shorted
Supercharger (SC) Boost Pressure Sensor 'A' circuit poor electrical connection

How to Fix the DTC P123B?

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 P123B 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 P123B code?

Need more information on how to fix the P123B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P123B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P123B Ford — BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation

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 P123B Code

1. What are the common symptoms of OBDII code P123B (BARO Sensor / TC/SC Boost Pressure Sensor 'B' Correlation)?

- Common symptoms include reduced engine power, rough idling, poor acceleration, and potential stalling.

2. What causes OBDII code P123B to trigger?

- The code P123B is triggered when there is a correlation issue between the BARO sensor and the turbocharger/supercharger boost pressure sensor 'B'.

3. How can I diagnose the cause of OBDII code P123B?

- Diagnosis involves checking the connections and wiring of the BARO sensor and boost pressure sensor 'B', as well as testing the sensors themselves for proper functionality.

4. Can a dirty air filter trigger OBDII code P123B?

- Yes, a dirty air filter can restrict airflow and affect the readings from the sensors, potentially leading to the triggering of code P123B.

5. What are some repair tips for fixing OBDII code P123B?

- Repair tips may include cleaning or replacing the air filter, inspecting and repairing any damaged wiring or connections, and replacing the BARO sensor or boost pressure sensor 'B' if necessary.

6. Is it safe to continue driving with OBDII code P123B present?

- It is not recommended to continue driving with OBDII code P123B present, as it can lead to further engine performance issues and potential damage if left unresolved.

7. Can a faulty turbocharger/supercharger cause OBDII code P123B?

- Yes, a faulty turbocharger or supercharger can affect the boost pressure readings and contribute to the triggering of code P123B.

8. How much does it typically cost to repair OBDII code P123B?

- The cost of repairing OBDII code P123B can vary depending on the exact cause of the issue, but it may involve expenses for sensor replacements, wiring repairs, and labor.

9. Are there any preventative measures to avoid OBDII code P123B in the future?

- Regular maintenance of the air intake system, including air filter replacement, can help prevent issues that may trigger code P123B. Additionally, monitoring engine performance regularly can help catch potential problems early.

10. Can a DIY enthusiast fix OBDII code P123B at home?

- While some basic checks and repairs can be done at home, diagnosing and repairing OBDII code P123B may require specialized tools and expertise, so professional assistance is often recommended.