AutoCodes – Cadillac – P2146 Cadillac

P2146 Cadillac 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 Cadillac 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 1,262

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

What does this mean?

What are the Possible Causes of the DTC P2146 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac Code

1. What does the OBDII code P2146 mean on a Cadillac?

P2146 indicates a problem with the Cylinder 1 Injector High Control Circuit, meaning the engine control module (ECM) has detected an issue with the electrical circuit controlling the fuel injector for cylinder 1.

2. What are the common symptoms of code P2146 on a Cadillac?

Symptoms may include a rough idle, engine misfires, reduced engine performance, poor fuel economy, difficulty starting the vehicle, or the Check Engine Light being illuminated.

3. What causes the P2146 code to appear on a Cadillac?

Common causes include a faulty fuel injector, damaged or corroded wiring or connectors in the injector circuit, a malfunctioning ECM, or issues with the injector's power supply.

4. Can I drive my Cadillac with a P2146 code?

Driving with a P2146 code is not recommended, as it can lead to reduced engine performance, increased emissions, and potential damage to the engine or catalytic converter.

5. How do I diagnose the P2146 code on a Cadillac?

Diagnosis typically involves using a scan tool to confirm the code, inspecting the injector wiring and connectors for damage or corrosion, testing the fuel injector, and checking the ECM for proper function.

6. What are some common fixes for the P2146 code on a Cadillac?

Repairs may include replacing the faulty fuel injector, repairing or replacing damaged wiring or connectors, updating or reprogramming the ECM, or replacing the ECM if necessary.

7. How much does it cost to fix the P2146 code on a Cadillac?

Repair costs vary depending on the exact issue, but replacing a fuel injector can range from $200 to $500, while wiring repairs or ECM replacement can cost more depending on labor and part costs.

8. Can a dirty fuel injector cause the P2146 code on a Cadillac?

While a dirty injector can cause performance issues, the P2146 code is typically related to an electrical fault in the injector circuit rather than a clog or dirt.

9. Do I need special tools to fix the P2146 code on a Cadillac?

Yes, diagnosing and repairing this code often requires a scan tool or multimeter to test the injector circuit, as well as basic tools to access and replace components.

10. Could a blown fuse cause the P2146 code on my Cadillac?

Yes, a blown fuse in the fuel injector circuit could interrupt power to the injector and trigger the P2146 code. Checking the fuses is a good first step in diagnosis.