AutoCodes – Generic – P12BD

P12BD Code - Cylinder 6 Injection Timing Related

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: P12BD indicates Cylinder 6 Injection Timing Related.
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 2,494

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 P12BD 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 P12BD - Cylinder 6 Injection Timing Related - AutoCodes.com — P12BD Code - Cylinder 6 Injection Timing Related

What does this mean?

What are the Possible Causes of the DTC P12BD?

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 P12BD?

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 P12BD 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 P12BD code?

Need more information on how to fix the P12BD code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P12BD code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P12BD Chevrolet — Cylinder 6 Injection Timing Related
P12BD GMC — Cylinder 6 Injection Timing Related

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 P12BD Code

1. What are the common symptoms of OBDII code P12BD (Cylinder 6 Injection Timing Related)?

- Common symptoms include rough idling, decreased engine performance, decreased fuel efficiency, and potential misfires in cylinder 6.

2. What are some possible causes of OBDII code P12BD?

- Possible causes include a faulty fuel injector in cylinder 6, issues with the fuel injection timing system, wiring or electrical issues, or a malfunctioning engine control module (ECM).

3. How can I diagnose OBDII code P12BD?

- Diagnosis typically involves using a diagnostic scanner to read the code, checking the fuel injector in cylinder 6 for proper functioning, inspecting the fuel injection timing system, and testing related wiring and connectors.

4. Can I continue driving with OBDII code P12BD present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the engine and catalytic converter if left unresolved.

5. How can I repair OBDII code P12BD?

- Repair may involve replacing the fuel injector in cylinder 6, addressing issues with the fuel injection timing system, repairing any damaged wiring or connectors, or reprogramming the ECM.

6. Are there any DIY tips for addressing OBDII code P12BD?

- DIY tips may include checking for loose or damaged connectors, ensuring proper fuel injector installation, and inspecting for any visible signs of damage in the fuel injection system.

7. How much does it typically cost to repair OBDII code P12BD?

- The cost of repair can vary depending on the specific issue causing the code, but it may range from $200 to $800 at a repair shop, including parts and labor.

8. Will resetting the OBDII code P12BD resolve the issue?

- Resetting the code may temporarily clear the warning light, but it will not fix the underlying issue causing the code to trigger. It is important to diagnose and repair the root cause.

9. Can a mechanic help me with resolving OBDII code P12BD?

- Yes, a qualified mechanic can diagnose the issue causing the code, perform the necessary repairs, and clear the code from the ECM to resolve the problem.

10. How often does OBDII code P12BD (Cylinder 6 Injection Timing Related) occur in vehicles?

- This specific code may occur infrequently, but when it does, it requires prompt attention to prevent engine damage and maintain optimal vehicle performance.