AutoCodes – GMC – P2154 2018 GMC Sierra

P2154 2018 GMC Sierra Code - Cylinder 3 Injector High Control Circuit High Voltage

Quick Answer

The Engine Control Module (ECM) supplies voltage to each fuel injector on the high control circuits. Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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: P2154 2018 GMC Sierra indicates Cylinder 3 Injector High Control Circuit High Voltage.
Common causes: Common causes include Faulty Fuel Injector 3, Fuel Injector 3 harness is open or shorted, Fuel Injector 3 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 187

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 08, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2154 2018 GMC Sierra 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 shorted to voltage for greater than 2 s.

OBDII Code P2154 2018 GMC Sierra - Cylinder 3 Injector High Control Circuit High Voltage - AutoCodes.com — P2154 2018 GMC Sierra Code - Cylinder 3 Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2154 2018 GMC Sierra?

Faulty Fuel Injector 3
Fuel Injector 3 harness is open or shorted
Fuel Injector 3 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2154 2018 GMC Sierra?

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 P2154 2018 GMC Sierra 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 P2154 2018 GMC Sierra code?

Need more information on how to fix the P2154 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the 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 P2154 2018 GMC Sierra Code

1. What does the OBDII code P2154 mean on a 2018 GMC Sierra?

P2154 indicates a problem with the Cylinder 3 Injector High Control Circuit, specifically detecting a high voltage condition.

2. What are the symptoms of code P2154 in a 2018 GMC Sierra?

Symptoms may include poor engine performance, rough idling, misfires, reduced fuel efficiency, or the engine not starting.

3. What causes the P2154 code on a 2018 GMC Sierra?

Common causes include a faulty fuel injector, wiring issues like damaged or corroded connections, or a malfunctioning engine control module (ECM).

4. Can I drive my 2018 GMC Sierra with the P2154 code?

Driving with the P2154 code is not recommended, as it can lead to poor performance, increased emissions, and potential damage to other engine components.

5. How do I diagnose the P2154 code on a 2018 GMC Sierra?

Diagnosis involves checking the injector wiring and connectors for damage, testing the fuel injector for proper function, and inspecting the ECM for faults.

6. How do I fix the P2154 code on my 2018 GMC Sierra?

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

7. How much does it cost to fix the P2154 code on a GMC Sierra?

Repair costs can vary, but replacing a fuel injector typically costs $200-$500, while wiring repairs or ECM replacement may add to the expense.

8. Can a bad fuel injector cause the P2154 code?

Yes, a malfunctioning fuel injector can lead to high control circuit voltage and trigger the P2154 code.

9. Will clearing the P2154 code fix the issue?

Clearing the code might temporarily turn off the check engine light, but it wonâ€™t resolve the underlying problem causing the code.

10. Is the P2154 code a common issue in the 2018 GMC Sierra?

While not extremely common, the P2154 code can occur due to age, wear, or electrical issues in the injector circuit. Regular maintenance can help prevent it.