AutoCodes – Chevrolet – P12B6 Chevrolet

P12B6 Chevrolet Code - Cylinder 2 Injection Timing Advance

Quick Answer

The Engine Control Module (ECM) has the ability to learn injector timing performance. Common causes include Contaminated or improper fuel quality, Worn base engine components or differences in cylinder compression, Faulty Fuel Injector. 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: P12B6 Chevrolet indicates Cylinder 2 Injection Timing Advance.
Common causes: Common causes include Contaminated or improper fuel quality, Worn base engine components or differences in cylinder compression, Faulty Fuel Injector.
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 1,626

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 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P12B6 Chevrolet Description

The Engine Control Module (ECM) has the ability to learn injector timing performance. With the engine at operating temperature and in closed throttle decel mode, the ECM will pulse each injector individually and measure the changes in rotational speed of the crankshaft using the input from the Crankshaft Position Sensor (CPS). The ECM will run this diagnostic under three different fuel rail pressures for each injector. The ECM will adjust the timing of fuel delivered by each injector to obtain the desired RPM increase. The ECM stores the injector timing value required to increase the crankshaft speed by the desired RPM. If the ECM cannot control an increase in RPM for a given injector the appropriate code will set for that injector.

OBDII Code P12B6 Chevrolet - Cylinder 2 Injection Timing Advance - AutoCodes.com — P12B6 Chevrolet Code - Cylinder 2 Injection Timing Advance

What does this mean?

What are the Possible Causes of the DTC P12B6 Chevrolet?

Contaminated or improper fuel quality
Worn base engine components or differences in cylinder compression
Faulty Fuel Injector
Fuel Injector harness is open or shorted
Fuel Injector circuit poor electrical connection

How to Fix the DTC P12B6 Chevrolet?

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 P12B6 Chevrolet 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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Need Help with the Code?

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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 P12B6 Chevrolet Code

1. What are the common symptoms of OBDII code P12B6 (Chevrolet) related to Cylinder 2 Injection Timing Advance?

- Common symptoms include engine misfires, rough idling, reduced power and acceleration, and potentially poor fuel efficiency.

2. What are the possible causes of OBDII code P12B6 (Chevrolet) indicating an issue with Cylinder 2 Injection Timing Advance?

- The possible causes can include faulty fuel injectors, a malfunctioning fuel injector control module, wiring issues, or problems with the engine control module.

3. How can I diagnose the OBDII code P12B6 (Chevrolet) concerning Cylinder 2 Injection Timing Advance?

- Diagnosis usually involves using an OBDII scanner to retrieve the code, inspecting the fuel injector and related components, checking for wiring faults, and performing a thorough fuel system analysis.

4. Is it safe to continue driving with OBDII code P12B6 (Chevrolet) triggered for Cylinder 2 Injection Timing Advance?

- It is generally not recommended to drive with this code active, as it can lead to further engine damage and potential safety risks. It's best to address the issue promptly.

5. What are some repair tips for addressing OBDII code P12B6 (Chevrolet) related to Cylinder 2 Injection Timing Advance?

- Repair tips may include cleaning or replacing the fuel injector, checking and repairing any wiring faults, resetting the engine control module, and conducting a comprehensive system test.

6. Can a DIY enthusiast fix OBDII code P12B6 (Chevrolet) associated with Cylinder 2 Injection Timing Advance?

- While some basic troubleshooting steps can be attempted by a DIY enthusiast, diagnosing and repairing this issue may require specialized tools and expertise. Professional assistance is often recommended.

7. How much does it typically cost to repair OBDII code P12B6 (Chevrolet) concerning Cylinder 2 Injection Timing Advance?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to a few thousand dollars, including parts and labor.

8. Will resetting the OBDII system clear the P12B6 code related to Cylinder 2 Injection Timing Advance?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It's essential to diagnose and fix the root cause.

9. Are there any preventive maintenance steps to avoid triggering OBDII code P12B6 (Chevrolet) for Cylinder 2 Injection Timing Advance?

- Regularly servicing the fuel system, using high-quality fuel, and following the manufacturer's maintenance schedule can help prevent issues leading to this OBDII code.

10. Can OBDII code P12B6 (Chevrolet) causing Cylinder 2 Injection Timing Advance problems affect vehicle emissions?

- Yes, this code can impact emissions by causing inefficient fuel combustion, potentially leading to increased emissions levels. It's important to address the issue promptly to minimize environmental impact.