AutoCodes – Generic – P120D

P120D Code - Secondary Fuel Injector Bank 2 Excessive 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: P120D indicates Secondary Fuel Injector Bank 2 Excessive 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.

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Code Popularity 10,751

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 P120D 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 P120D - Secondary Fuel Injector Bank 2 Excessive Flow - AutoCodes.com — P120D Code - Secondary Fuel Injector Bank 2 Excessive Flow

What does this mean?

What are the Possible Causes of the DTC P120D?

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 P120D?

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 P120D 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 P120D code?

Need more information on how to fix the P120D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P120D code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P120D Ford — Secondary Fuel Injector Bank 2 Excessive 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 P120D Code

1. What are the common symptoms of OBDII code P120D (Secondary Fuel Injector Bank 2 Excessive Flow)?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling of the vehicle.

2. What could be the potential causes of OBDII code P120D?

- Potential causes may include a faulty fuel injector in bank 2, clogged fuel injector, fuel pressure issues, vacuum leaks, or a problem with the fuel injection system.

3. How can I diagnose OBDII code P120D?

- Diagnosis typically involves using an OBDII scanner to read the code, checking for other related codes, inspecting the fuel injectors, testing fuel pressure, and looking for any visible signs of leaks or damage.

4. Can driving with OBDII code P120D cause further damage to the vehicle?

- Continuing to drive with this code may lead to engine damage, decreased performance, and potential issues with the catalytic converter. It is recommended to address the issue promptly.

5. How can I repair OBDII code P120D?

- Repairing this code may involve cleaning or replacing the fuel injector in bank 2, addressing any fuel system issues, fixing vacuum leaks, and clearing the code with an OBDII scanner.

6. Is it safe to continue driving with OBDII code P120D?

- It is not recommended to drive with this code present, as it can lead to further damage to the vehicle's engine and components. It is advisable to address the issue as soon as possible.

7. Are there any DIY tips for fixing OBDII code P120D?

- DIY tips may include checking for visible signs of damage, cleaning the fuel injectors, inspecting for vacuum leaks, and ensuring proper fuel pressure. However, complex repairs may require professional assistance.

8. How much does it cost to repair OBDII code P120D?

- The cost of repair can vary depending on the underlying issue causing the code. It may range from a simple cleaning of the fuel injector to a more involved repair or replacement, which can impact the overall cost.

9. Can a faulty oxygen sensor trigger OBDII code P120D?

- While a faulty oxygen sensor is not a direct cause of this code, it can contribute to fuel system issues that may lead to the triggering of OBDII code P120D if left unresolved.

10. How long does it typically take to repair OBDII code P120D?

- The repair time can vary based on the specific cause of the code and the complexity of the repair needed. Simple fixes may take a few hours, while more involved repairs could require a day or more.