AutoCodes – Generic – P2146

P2146 Code - Cylinder 1 Injector High Control Circuit

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 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: P2146 indicates Cylinder 1 Injector High Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 1, Fuel Injector 1 harness is open or shorted, Fuel Injector 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.

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Code Popularity 35,324

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2146 Description

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. The ECM energizes each fuel injector by grounding the low control circuit of the fuel injector. The ECM monitors the status of the fuel injector circuits. When a fuel injector circuit condition is detected by the ECM, the affected fuel injector(s) is disabled. The Diagnostic Trouble Code (DTC) will be set when the ECM detects the fuel injector high voltage supply circuit is not to factory specifications.

OBDII Code P2146 - Cylinder 1 Injector High Control Circuit - AutoCodes.com — P2146 Code - Cylinder 1 Injector High Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2146?

Faulty Fuel Injector 1
Fuel Injector 1 harness is open or shorted
Fuel Injector 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2146?

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 P2146 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 P2146 code?

Need more information on how to fix the P2146 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2146 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P2146 Buick — Cylinder 1 Injector High Control Circuit
P2146 Cadillac — Cylinder 1 Injector High Control Circuit
P2146 Chevrolet — Cylinder 1 Injector High Control Circuit
P2146 Chrysler — Bank 1 Cylinders 1-3 Shorted High Or Low
P2146 Dodge — Bank 1 Cylinders 1-3 Shorted High Or Low
P2146 GMC — Cylinder 1 Injector High Control Circuit
P2146 Hyundai — Fuel Injector Group 'A' Supply Voltage Circuit Open
P2146 Jeep — Bank 1 Cylinders 1-3 Shorted High Or Low
P2146 KIA — Fuel Injector Group 'A' Supply Voltage Circuit Open
P2146 Nissan — No. 1 And 4 Cylinder Fuel Injector Power Supply Circuit Open
P2146 Volkswagen — Fuel Injector Group 'A' Supply Voltage Circuit/Open

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 P2146 Code

1. What are the common symptoms of OBDII code P2146 (Cylinder 1 Injector High Control Circuit)?

The common symptoms include rough idling, engine misfires, decreased fuel efficiency, and possibly an illuminated check engine light.

2. What are the possible causes of OBDII code P2146?

Possible causes include a faulty fuel injector in cylinder 1, a wiring issue in the injector control circuit, a poor electrical connection, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P2146?

Diagnosis involves using a scan tool to read the code, checking the wiring and connections related to the injector in cylinder 1, and testing the injector itself for proper function.

4. Can I drive my vehicle with OBDII code P2146?

It is not recommended to drive your vehicle with this code present, as it can lead to further engine damage and decreased performance. It is best to address the issue promptly.

5. How can I repair OBDII code P2146?

Repair options include replacing the fuel injector in cylinder 1 if it is faulty, repairing any damaged wiring or connectors, and resetting the ECM after the issue has been resolved.

6. Are there any DIY tips for fixing OBDII code P2146?

While some simple wiring checks can be done by DIY enthusiasts, it is recommended to have a professional technician diagnose and repair this code to ensure proper resolution.

7. How much does it cost to fix OBDII code P2146?

The cost of fixing this code can vary depending on the cause of the issue and the labor rates in your area. It is advisable to get a diagnosis from a mechanic to determine the exact cost.

8. Can a bad fuel injector cause OBDII code P2146?

Yes, a malfunctioning fuel injector in cylinder 1 can trigger this code, as it affects the high control circuit for that specific injector.

9. Will OBDII code P2146 affect my vehicle's performance?

Yes, this code can affect your vehicle's performance by causing rough idling, engine misfires, and decreased fuel efficiency. Addressing the issue promptly is important.

10. How long does it take to fix OBDII code P2146?

The repair time can vary depending on the exact cause of the issue and the availability of parts. It is best to consult with a mechanic for an estimate of the repair time.