AutoCodes – GMC – P2155 GMC

P2155 GMC Code - Cylinder 4 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 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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: P2155 GMC indicates Cylinder 4 Injector High Control Circuit.
Common causes: Common causes include Faulty Fuel Injector 4, Fuel Injector 4 harness is open or shorted, Fuel Injector 4 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 2,359

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 P2155 GMC 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 P2155 GMC - Cylinder 4 Injector High Control Circuit - AutoCodes.com — P2155 GMC Code - Cylinder 4 Injector High Control Circuit

What does this mean?

What are the Possible Causes of the DTC P2155 GMC?

Faulty Fuel Injector 4
Fuel Injector 4 harness is open or shorted
Fuel Injector 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2155 GMC?

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 P2155 GMC 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 P2155 GMC code?

Need more information on how to fix the P2155 GMC code? Get Access to Factory Service Manuals

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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 P2155 GMC Code

1. What are the common symptoms of OBDII code P2155 GMC (Cylinder 4 Injector High Control Circuit)?

- Common symptoms include rough idling, engine misfires, decreased fuel efficiency, and potential stalling issues.

2. What are the possible causes of OBDII code P2155 GMC?

- The code P2155 GMC can be triggered by issues such as a faulty injector in cylinder 4, wiring problems, poor electrical connections, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P2155 GMC?

- To diagnose the cause of the code, you can perform a visual inspection of the injector and its wiring, test the injector for proper functioning, check for any loose connections, and use a scan tool to analyze live data from the ECM.

4. What repair tips can help fix OBDII code P2155 GMC?

- Repair tips include replacing the faulty injector in cylinder 4, repairing or replacing damaged wiring, ensuring proper electrical connections, and resetting the ECM after completing repairs.

5. Can I drive my vehicle with OBDII code P2155 GMC active?

- It is not recommended to drive your vehicle with an active P2155 GMC code, as it can lead to poor engine performance, potential damage to the catalytic converter, and unsafe driving conditions.

6. How much does it typically cost to repair OBDII code P2155 GMC?

- The cost of repairing the code P2155 GMC can vary depending on the exact cause of the issue, but it may range from $200 to $500 for parts and labor.

7. Will resetting the OBDII code P2155 GMC make it go away permanently?

- Resetting the code may temporarily clear the Check Engine Light, but if the underlying issue is not addressed and fixed, the code is likely to reappear.

8. Can a DIY enthusiast fix OBDII code P2155 GMC at home?

- Depending on your mechanical skills and access to tools, some DIY enthusiasts may be able to diagnose and repair the code P2155 GMC at home. However, complex issues may require professional assistance.

9. Is OBDII code P2155 GMC a serious problem that needs immediate attention?

- While the severity of the issue can vary, it is generally recommended to address OBDII code P2155 GMC promptly to prevent further damage to the engine and ensure safe operation of the vehicle.

10. How long does it typically take to repair OBDII code P2155 GMC?

- The repair time for OBDII code P2155 GMC can vary depending on the exact cause and the extent of the repairs needed, but it may take a few hours to a full day to complete the diagnosis and fix the issue.