AutoCodes – Buick – P2146 Buick

P2146 Buick 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 Buick 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 1,284

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

What does this mean?

What are the Possible Causes of the DTC P2146 Buick?

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 Buick?

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 Buick 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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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 Buick Code

What does the OBDII code P2146 mean on a Buick?

P2146 indicates a problem with the high control circuit for the fuel injector in cylinder 1, often related to electrical issues or injector failure.

What are common symptoms of code P2146 in a Buick?

Symptoms may include poor engine performance, rough idling, reduced fuel efficiency, misfires, or the engine failing to start.

What causes the P2146 code on a Buick?

Common causes include faulty fuel injectors, damaged wiring or connectors, a malfunctioning powertrain control module (PCM), or electrical issues in the injector circuit.

Can I drive my Buick with a P2146 code?

Driving with this code is not recommended, as it can lead to poor engine performance, further damage to the injector system, and potential safety concerns.

How can I diagnose the P2146 code on my Buick?

Start by inspecting the injector wiring and connectors for damage, testing the fuel injector with a multimeter, and using a scan tool to monitor live data for the injector circuit.

What tools are needed to repair a P2146 code on a Buick?

Tools may include a multimeter, OBDII scan tool, wiring repair kit, and possibly a replacement fuel injector or PCM if necessary.

Does the P2146 code always mean the injector is bad?

No, it could also indicate wiring issues, connector problems, or a fault in the PCM rather than a defective injector.

How much does it cost to fix a P2146 code on a Buick?

Repair costs vary depending on the issue. Replacing a fuel injector may cost $150â€“$300, while wiring repairs or PCM replacement can cost more.

Can a dirty fuel injector trigger the P2146 code?

While a dirty injector can cause performance issues, the P2146 code specifically refers to an electrical problem, not a clog or contamination.

What should I do first if my Buick shows a P2146 code?

Begin by inspecting the wiring and connectors for visible damage, then clear the code and see if it reappears before proceeding with further diagnosis.