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Engine-Codes – GMC – P2155 GMC

P2155 GMC Code - Cylinder 4 Injector High Control Circuit

Quick Answer

The P2155 GMC diagnostic trouble code (DTC) specifically refers to an issue with the Cylinder 4 Injector High Control Circuit in the vehicle's fuel injection system. Common causes include Faulty fuel injector in cylinder 4, Wiring or connector issues in the control circuit, PCM malfunction. 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 in cylinder 4, Wiring or connector issues in the control circuit, PCM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 06, 2024
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Code P2155 GMC Description

The P2155 GMC diagnostic trouble code (DTC) specifically refers to an issue with the Cylinder 4 Injector High Control Circuit in the vehicle's fuel injection system. In a multi-port fuel injection system, each cylinder has its own fuel injector, which is responsible for delivering the precise amount of fuel into the combustion chamber at the right time. The PCM (Powertrain Control Module) controls the operation of the fuel injectors by sending signals to them to open and close according to the engine's needs.

OBDII Code P2155 GMC - Cylinder 4 Injector High Control Circuit
P2155 GMC Code - Cylinder 4 Injector High Control Circuit

Common Causes of P2155 GMC

  1. Faulty fuel injector in cylinder 4
  2. Wiring or connector issues in the control circuit
  3. PCM malfunction
  4. Clogged or dirty fuel injector
  5. Electrical issues such as a short circuit or open circuit in the wiring

Symptoms of P2155 GMC

  1. Rough idling or engine misfires
  2. Decreased fuel efficiency
  3. Engine hesitation or stalling
  4. Check Engine Light illuminated
  5. Reduced overall engine performance

How to Fix P2155 GMC

  1. Begin by conducting a visual inspection of the wiring and connectors associated with the fuel injector in cylinder 4 to check for any signs of damage or corrosion.
  2. Use a multimeter to test the continuity and resistance of the wiring to identify any potential issues with the circuit.
  3. Test the fuel injector itself to determine if it is functioning properly or needs to be replaced.
  4. If the issue lies with the wiring or connectors, repair or replace them as needed.
  5. Clear the DTC from the PCM memory using a scan tool and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2155 GMC

The cost of repairing a P2155 GMC code can vary depending on the specific cause of the issue. In general, replacing a fuel injector can range from $150 to $300 per injector, not including labor costs. Wiring repairs or connector replacements may add to the overall cost. Labor rates at auto repair shops typically range from $80 to $150 per hour, but can be higher in metropolitan areas or at dealerships. It's advisable to contact local shops for a more accurate estimate based on your vehicle's make and model.

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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.

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