AutoCodes – Chevrolet – P12C0 Chevrolet

P12C0 Chevrolet Code - Cylinder 7 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: P12C0 Chevrolet indicates Cylinder 7 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,157

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P12C0 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 P12C0 Chevrolet - Cylinder 7 Injection Timing Advance - AutoCodes.com — P12C0 Chevrolet Code - Cylinder 7 Injection Timing Advance

What does this mean?

What are the Possible Causes of the DTC P12C0 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 P12C0 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 P12C0 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.

Need more information about the P12C0 Chevrolet code?

Need more information on how to fix the P12C0 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P12C0 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 P12C0 Chevrolet Code

1. What are the common symptoms of OBDII code P12C0 in a Chevrolet related to Cylinder 7 Injection Timing Advance?

The common symptoms include rough engine idle, decreased fuel efficiency, lack of power, and potential engine misfires.

2. What are the possible causes of OBDII code P12C0 in a Chevrolet indicating an issue with Cylinder 7 Injection Timing Advance?

Possible causes include a faulty fuel injector, issues with the fuel injection system, wiring problems, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the OBDII code P12C0 in a Chevrolet related to Cylinder 7 Injection Timing Advance?

Diagnosis typically involves using a scan tool to read the code, testing the fuel injector and related components, checking wiring for continuity and shorts, and inspecting the ECM for any faults.

4. What are some repair tips for addressing OBDII code P12C0 in a Chevrolet associated with Cylinder 7 Injection Timing Advance?

Repair tips may include replacing the faulty fuel injector, repairing any damaged wiring, cleaning or replacing fuel filters, ensuring proper fuel pressure, and resetting the ECM after repairs.

5. Can driving with OBDII code P12C0 in a Chevrolet indicating Cylinder 7 Injection Timing Advance issues cause further damage?

Continued driving with this issue can potentially lead to engine damage, decreased performance, and reduced fuel efficiency. It is recommended to address the problem promptly.

6. Is it safe to reset the OBDII code P12C0 in a Chevrolet without addressing the underlying Cylinder 7 Injection Timing Advance problem?

Resetting the code without fixing the root cause may temporarily clear the warning light, but the issue will persist and could lead to more severe problems down the line. It's advisable to address the problem first.

7. How much does it typically cost to repair OBDII code P12C0 in a Chevrolet related to Cylinder 7 Injection Timing Advance?

The cost of repair can vary depending on the specific issue causing the code, but it may range from a few hundred to a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix OBDII code P12C0 in a Chevrolet indicating Cylinder 7 Injection Timing Advance issues?

While some aspects of the repair, such as checking wiring or replacing filters, may be tackled by a skilled DIYer, diagnosing and fixing more complex issues like faulty injectors or ECM problems may require professional assistance.

9. How often does OBDII code P12C0 in a Chevrolet related to Cylinder 7 Injection Timing Advance occur?

The occurrence of this specific code may vary, but issues related to fuel injection timing advance can happen due to various factors, including wear and tear on components or poor maintenance practices.

10. Are there any preventative measures to avoid experiencing OBDII code P12C0 in a Chevrolet linked to Cylinder 7 Injection Timing Advance?

Regular maintenance, including timely fuel system inspections, using high-quality fuel, and addressing any engine performance issues promptly, can help prevent issues leading to this specific OBDII code.