AutoCodes – GMC – P12BF GMC

P12BF GMC Code - Cylinder 7 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: P12BF GMC indicates Cylinder 7 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 1,223

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 P12BF GMC 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 P12BF GMC - Cylinder 7 Injection Timing Related - AutoCodes.com — P12BF GMC Code - Cylinder 7 Injection Timing Related

What does this mean?

What are the Possible Causes of the DTC P12BF GMC?

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 P12BF GMC?

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 P12BF GMC 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 P12BF GMC 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 P12BF GMC Code

1. What are the common symptoms of OBDII code P12BF GMC (Cylinder 7 Injection Timing Related)?

- Common symptoms include rough idle, decreased engine performance, misfires, and potentially increased fuel consumption.

2. What can cause the OBDII code P12BF GMC to trigger?

- This code is typically triggered by issues related to the fuel injection timing in cylinder 7, such as a faulty fuel injector or a timing issue.

3. How can I diagnose the cause of OBDII code P12BF GMC?

- Diagnosis involves using a scan tool to monitor the fuel injection timing parameters for cylinder 7 and checking the fuel injector for proper operation.

4. What are some possible repair tips for resolving OBDII code P12BF GMC?

- Repair tips may include replacing the fuel injector for cylinder 7, addressing any timing issues, and ensuring proper fuel system function.

5. Can driving with OBDII code P12BF GMC cause further damage to the vehicle?

- Continuing to drive with this code present can potentially lead to engine damage or further fuel system issues, so it is advisable to address the problem promptly.

6. Is it safe to continue driving my vehicle with OBDII code P12BF GMC?

- It is not recommended to drive the vehicle with this code active, as it can impact engine performance and fuel efficiency, and may lead to more severe issues if left unresolved.

7. Are there any common mistakes to avoid when trying to fix OBDII code P12BF GMC?

- Common mistakes include ignoring the code, assuming it will resolve itself, or neglecting to address the underlying fuel injection timing issue in cylinder 7.

8. How much does it typically cost to repair OBDII code P12BF GMC?

- The cost of repair can vary depending on the specific cause of the code, but it may involve expenses for diagnostic tools, replacement parts, and labor.

9. Can a DIY enthusiast fix OBDII code P12BF GMC at home?

- While some aspects of diagnosing and repairing this code may be possible for experienced DIY enthusiasts, it is often recommended to seek professional help for accurate diagnosis and repair.

10. How urgent is it to address OBDII code P12BF GMC once it appears?

- It is advisable to address this code promptly to prevent potential engine damage, ensure optimal performance, and prevent further fuel system issues.