AutoCodes – Generic – P120C

P120C Code - Secondary Fuel Injector Bank 2 Insufficient Flow

Quick Answer

The Powertrain Control Module (PCM) monitors the Secondary Fuel Injector Bank 2. Common causes include Faulty Secondary Fuel Injector Bank 2, Secondary Fuel Injector Bank 2 harness is open or shorted, Secondary Fuel Injector Bank 2 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: P120C indicates Secondary Fuel Injector Bank 2 Insufficient Flow .
Common causes: Common causes include Faulty Secondary Fuel Injector Bank 2, Secondary Fuel Injector Bank 2 harness is open or shorted, Secondary Fuel Injector Bank 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 2,851

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P120C Description

The Powertrain Control Module (PCM) monitors the Secondary Fuel Injector Bank 2. The PCM sets the OBDII code when the Secondary Fuel Injector Bank 2 is not to factory specifications.

OBDII Code P120C - Secondary Fuel Injector Bank 2 Insufficient Flow - AutoCodes.com — P120C Code - Secondary Fuel Injector Bank 2 Insufficient Flow

What does this mean?

What are the Possible Causes of the DTC P120C?

Faulty Secondary Fuel Injector Bank 2
Secondary Fuel Injector Bank 2 harness is open or shorted
Secondary Fuel Injector Bank 2 circuit poor electrical connection

How to Fix the DTC P120C?

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 P120C 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 P120C code?

Need more information on how to fix the P120C code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P120C code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P120C Ford — Secondary Fuel Injector Bank 2 Insufficient Flow

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 P120C Code

1. What are the common symptoms of OBDII code P120C (Secondary Fuel Injector Bank 2 Insufficient Flow)?

- Common symptoms include rough idling, poor acceleration, engine misfires, and a decrease in fuel efficiency.

2. What are the possible causes of OBDII code P120C?

- The code P120C can be triggered by issues such as a clogged fuel injector, fuel delivery problems, wiring issues, or a faulty fuel injector control module.

3. How can I diagnose the cause of OBDII code P120C?

- To diagnose the issue, you can perform a visual inspection of the fuel injector, check the fuel pressure, test the fuel injector for proper operation, and inspect the wiring for any damage.

4. Can a dirty fuel injector cause OBDII code P120C?

- Yes, a dirty or clogged fuel injector can restrict fuel flow, leading to insufficient flow in Bank 2 and triggering the OBDII code P120C.

5. What are the repair options for OBDII code P120C?

- Repair options may include cleaning or replacing the fuel injector, fixing any fuel delivery issues, repairing damaged wiring, or replacing the fuel injector control module.

6. How important is it to address OBDII code P120C promptly?

- It is essential to address the code promptly to prevent further damage to the engine and ensure optimal performance and fuel efficiency of the vehicle.

7. Can driving with OBDII code P120C cause damage to the vehicle?

- Driving with OBDII code P120C can potentially lead to engine damage, decreased performance, and increased fuel consumption if left unaddressed for an extended period.

8. How much does it typically cost to repair OBDII code P120C?

- The cost of repairing OBDII code P120C can vary depending on the underlying issue, but it may range from a few hundred to a few thousand dollars, including parts and labor.

9. Can I reset the OBDII code P120C without fixing the underlying issue?

- While you can reset the code using an OBDII scanner, it is not recommended as the issue causing the code will persist, potentially leading to further problems down the line.

10. Is it possible to prevent OBDII code P120C from occurring in the future?

- Regular maintenance, including using high-quality fuel and injector cleaner, can help prevent issues that may trigger OBDII code P120C and ensure the proper functioning of the fuel system.