AutoCodes – Generic – P123C

P123C Code - Turbocharger System

Quick Answer

The Powertrain Control Module (PCM) monitors the Turbocharger System. Common causes include Faulty Turbocharger System, Turbocharger System harness is open or shorted, Turbocharger System 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: P123C indicates Turbocharger System .
Common causes: Common causes include Faulty Turbocharger System, Turbocharger System harness is open or shorted, Turbocharger System 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 2,303

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 P123C Description

The Powertrain Control Module (PCM) monitors the Turbocharger System. The PCM sets the OBDII code when the Turbocharger System is not to factory specifications.

OBDII Code P123C - Turbocharger System - AutoCodes.com — P123C Code - Turbocharger System

What does this mean?

What are the Possible Causes of the DTC P123C?

Faulty Turbocharger System
Turbocharger System harness is open or shorted
Turbocharger System circuit poor electrical connection

How to Fix the DTC P123C?

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 P123C 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 P123C code?

Need more information on how to fix the P123C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P123C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P123C BMW — Nitrogen Oxide Sensor Sensor Poisoning Binary Lambda Signal Too Lean
P123C Ford — Turbocharger System
P123C MINI — Nitrogen Oxide Sensor Sensor Poisoning Binary Lambda Signal Too Lean

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 P123C Code

1. What are common symptoms of OBDII code P123C (Turbocharger System)?

Symptoms may include reduced engine power, poor acceleration, loud noises from the turbocharger, and the vehicle going into limp mode.

2. What are possible causes of OBDII code P123C (Turbocharger System)?

Potential causes include a faulty turbocharger wastegate, turbocharger actuator issues, boost pressure sensor malfunction, vacuum leaks, or a clogged air filter.

3. How can I diagnose OBDII code P123C (Turbocharger System)?

Diagnosis typically involves using a scan tool to read the code, checking the turbocharger system for leaks, inspecting the wastegate and actuator, and testing the boost pressure sensor.

4. Can a dirty air filter cause OBDII code P123C (Turbocharger System)?

Yes, a clogged or dirty air filter can restrict airflow to the turbocharger, leading to issues with boost pressure and triggering the P123C code.

5. Is it safe to continue driving with OBDII code P123C (Turbocharger System)?

It is not recommended to drive with this code present, as it can lead to further damage to the turbocharger and engine components. It is best to address the issue promptly.

6. How can I repair OBDII code P123C (Turbocharger System) at home?

If you have the necessary tools and expertise, you may be able to replace the turbocharger wastegate, actuator, boost pressure sensor, or address any vacuum leaks causing the code.

7. Can a software update fix OBDII code P123C (Turbocharger System)?

In some cases, a software update from the manufacturer can resolve the code by adjusting the parameters related to the turbocharger system.

8. Will resetting the OBDII code P123C (Turbocharger System) make it go away permanently?

Simply clearing the code without addressing the underlying issue will not fix the problem permanently. The code is likely to reappear until the root cause is resolved.

9. How much does it cost to repair OBDII code P123C (Turbocharger System) at a mechanic?

The cost of repairs can vary depending on the specific issue causing the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. What is the importance of addressing OBDII code P123C (Turbocharger System) promptly?

Promptly addressing the code can prevent further damage to the turbocharger and engine, improve vehicle performance and fuel efficiency, and ensure safe operation of the vehicle.