AutoCodes – Cadillac – P124B Cadillac

P124B Cadillac Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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: P124B Cadillac indicates Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 557

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P124B Cadillac Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector high voltage supply circuits. The ECM energizes each fuel injector by grounding the high voltage control circuit of the fuel injector. The ECM monitors the status of the injector high voltage supply circuits and the fuel injector high voltage control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set if the ECM detects the injector high control circuit is shorted to the low control circuit for greater than 2 s.

OBDII Code P124B Cadillac - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit - AutoCodes.com — P124B Cadillac Code - Injector 4 Positive Voltage Control Circuit Shorted to Control Circuit

What does this mean?

What are the Possible Causes of the DTC P124B Cadillac?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P124B Cadillac?

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 P124B Cadillac 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.

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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 P124B Cadillac Code

What are common symptoms of OBDII code P124B in a Cadillac related to the Injector 4 Positive Voltage Control Circuit?

Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling issues.

What are some possible causes of OBDII code P124B in a Cadillac related to the Injector 4 Positive Voltage Control Circuit?

Possible causes include a short circuit in the wiring, a faulty fuel injector, a defective PCM (Powertrain Control Module), or a poor electrical connection.

How can I diagnose the OBDII code P124B in a Cadillac related to the Injector 4 Positive Voltage Control Circuit?

Diagnosis involves using an OBDII scanner to read the code, inspecting the wiring and connections related to Injector 4, and testing the fuel injector and PCM for proper function.

What are some repair tips for addressing OBDII code P124B in a Cadillac related to the Injector 4 Positive Voltage Control Circuit?

Repair tips include checking and repairing any damaged wiring, replacing the faulty fuel injector if necessary, ensuring proper ground connections, and resetting the PCM after repairs are made.

Can I continue driving my Cadillac with OBDII code P124B related to the Injector 4 Positive Voltage Control Circuit?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further engine damage or poor performance. It is best to address the issue promptly.

How much does it typically cost to repair OBDII code P124B related to the Injector 4 Positive Voltage Control Circuit in a Cadillac?

The cost of repair can vary depending on the exact cause of the issue, but it may range from $100 to $500 or more, including parts and labor.

Is it possible to prevent OBDII code P124B related to the Injector 4 Positive Voltage Control Circuit in a Cadillac?

While some causes of this code may be unavoidable, regular maintenance and inspections of the fuel system and electrical components can help prevent issues that may trigger this code.

What are the long-term effects of ignoring OBDII code P124B related to the Injector 4 Positive Voltage Control Circuit in a Cadillac?

Ignoring this code can lead to worsening engine performance, increased fuel consumption, potential damage to engine components, and eventual breakdown if left unresolved.