AutoCodes – GMC – P122A GMC

P122A GMC Code - Fuel Injector 3 Control Circuit Shorted

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P122A GMC indicates Fuel Injector 3 Control Circuit Shorted.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 585

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 Nov 10, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P122A GMC Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the injector positive voltage control circuits. The ECM energizes each fuel injector by grounding the control circuit of that fuel injector. The ECM monitors the status of the injector positive voltage control circuits and the fuel injector control circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injectors will be disabled and may disable the affected group of fuel injectors. The Diagnostic Trouble Code (DTC) will set when the ECM injector output driver detects an incorrect current on a fuel injector circuit.

OBDII Code P122A GMC - Fuel Injector 3 Control Circuit Shorted - AutoCodes.com — P122A GMC Code - Fuel Injector 3 Control Circuit Shorted

What does this mean?

What are the Possible Causes of the DTC P122A GMC?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P122A GMC?

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 P122A GMC 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 P122A GMC Code

1. What are common symptoms of OBDII code P122A GMC (Fuel Injector 3 Control Circuit Shorted)?

- Common symptoms include rough idling, engine misfires, poor acceleration, and potential stalling of the vehicle.

2. What can cause the OBDII code P122A GMC to trigger?

- The code P122A GMC is typically triggered by a short circuit in the control circuit of fuel injector 3.

3. How serious is OBDII code P122A GMC (Fuel Injector 3 Control Circuit Shorted)?

- This code should be addressed promptly to prevent potential engine damage and ensure optimal vehicle performance.

4. Can a faulty fuel injector be the cause of code P122A GMC?

- Yes, a faulty fuel injector can cause the control circuit to short, triggering the P122A GMC code.

5. How can I diagnose and repair OBDII code P122A GMC?

- Diagnosing the code involves inspecting the wiring and connectors related to fuel injector 3, testing the fuel injector itself, and addressing any issues found.

6. Are there any DIY repair tips for OBDII code P122A GMC?

- DIY repair tips include checking for loose or damaged wiring, ensuring proper fuel injector connections, and testing the fuel injector resistance.

7. Can driving with OBDII code P122A GMC cause further damage?

- Driving with this code can potentially lead to decreased fuel efficiency, engine performance issues, and even damage to other engine components if left unresolved.

8. How much does it typically cost to repair OBDII code P122A GMC?

- The cost of repairing this code can vary depending on the underlying cause, but it may involve replacing a faulty fuel injector or repairing the wiring/connectors.

9. Can resetting the OBDII system clear code P122A GMC temporarily?

- Resetting the OBDII system may temporarily clear the code, but it is crucial to address the root cause to prevent it from reoccurring.

10. Is it safe to continue driving with OBDII code P122A GMC?

- It is not recommended to drive with this code as it can lead to potential engine issues and decreased vehicle performance. It is best to address the problem promptly.