P120B Code - Secondary Fuel Injector Bank 1 Excessive Flow
Quick Answer
The Powertrain Control Module (PCM) monitors the Secondary Fuel Injector Bank 1. Common causes include Faulty Secondary Fuel Injector Bank 1, Secondary Fuel Injector Bank 1 harness is open or shorted, Secondary Fuel Injector Bank 1 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
- P120B indicates Secondary Fuel Injector Bank 1 Excessive Flow .
- Common causes
- Common causes include Faulty Secondary Fuel Injector Bank 1, Secondary Fuel Injector Bank 1 harness is open or shorted, Secondary Fuel Injector Bank 1 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.
Code P120B Description
What are the Possible Causes of the DTC P120B?
- Faulty Secondary Fuel Injector Bank 1
- Secondary Fuel Injector Bank 1 harness is open or shorted
- Secondary Fuel Injector Bank 1 circuit poor electrical connection
How to Fix the DTC P120B?
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 P120B 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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Information for Specific Makes
- P120B Ford — Secondary Fuel Injector Bank 1 Excessive Flow
Frequently Asked Questions about P120B Code
1. What does the OBDII code P120B mean?
P120B indicates that the secondary fuel injector in Bank 1 is delivering more fuel than expected, leading to excessive flow.
2. What are the common symptoms of code P120B?
Common symptoms include poor fuel economy, rough idling, engine misfires, reduced power, and the Check Engine Light being illuminated.
3. What causes the P120B code to appear?
Potential causes include a stuck-open secondary fuel injector, a faulty fuel pressure regulator, damaged wiring or connectors, or a malfunctioning Powertrain Control Module (PCM).
4. Can I drive with the P120B code active?
Driving with this code is not recommended, as it can lead to engine damage, excessive emissions, and further issues with engine performance.
5. How do I diagnose the P120B code?
Diagnosis involves checking the secondary fuel injector for proper operation, inspecting wiring and connectors, testing fuel pressure, and using a scan tool to monitor fuel flow data.
6. How can the P120B code be fixed?
Repairs may include replacing the faulty injector, repairing damaged wiring, cleaning fuel injectors, or replacing the PCM if it is determined to be faulty.
7. Can a clogged fuel injector cause the P120B code?
No, a clogged injector typically causes insufficient fuel flow. P120B specifically refers to excessive fuel flow.
8. Is the P120B code related to a specific vehicle make or model?
This code may appear on various vehicles that utilize secondary fuel injection systems, but the exact diagnosis and repair procedures can vary by manufacturer.
9. How much does it cost to fix the P120B code?
Repair costs can range from $150 to $600 or more, depending on whether the issue is with the injector, wiring, or PCM.
10. Can a dirty fuel system trigger the P120B code?
While a dirty fuel system is not a direct cause, it can contribute to injector malfunction, which could lead to excessive fuel flow.
Discuss the causes and fixes for P120B OBDII Code
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