AutoCodes – Chevrolet – P2156 2018 Chevrolet Silverado

P2156 2018 Chevrolet Silverado Code - Cylinder 4 Injector High Control Circuit Low 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 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: P2156 2018 Chevrolet Silverado indicates Cylinder 4 Injector High Control Circuit Low Voltage.
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 404

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P2156 2018 Chevrolet Silverado 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 ground for greater than 2 s.

OBDII Code P2156 2018 Chevrolet Silverado - Cylinder 4 Injector High Control Circuit Low Voltage - AutoCodes.com — P2156 2018 Chevrolet Silverado Code - Cylinder 4 Injector High Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2156 2018 Chevrolet Silverado?

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 P2156 2018 Chevrolet Silverado?

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 P2156 2018 Chevrolet Silverado 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 P2156 2018 Chevrolet Silverado code?

Need more information on how to fix the P2156 2018 Chevrolet Silverado 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 P2156 2018 Chevrolet Silverado Code

1. What are the common symptoms of OBDII code P2156 on a 2018 Chevrolet Silverado?

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

2. What does the OBDII code P2156 "Cylinder 4 Injector High Control Circuit Low Voltage" indicate?

- This code indicates a low voltage condition in the control circuit of the fuel injector for cylinder 4 in the engine.

3. What are the possible causes of the P2156 trouble code on a 2018 Chevrolet Silverado?

- Possible causes include a faulty fuel injector, damaged wiring or connectors, a malfunctioning powertrain control module (PCM), or issues with the fuel injector driver circuit.

4. How can I diagnose the cause of OBDII code P2156 on my Chevrolet Silverado?

- Diagnose the code by checking the wiring and connectors associated with the cylinder 4 fuel injector, testing the fuel injector itself, and inspecting the PCM for any faults.

5. Can driving with OBDII code P2156 on a 2018 Chevrolet Silverado cause further damage?

- Continuing to drive with this code may lead to poor engine performance, increased fuel consumption, and potential damage to the catalytic converter over time.

6. How should I repair OBDII code P2156 on my 2018 Chevrolet Silverado?

- Repair involves addressing the root cause, such as replacing the faulty fuel injector, repairing damaged wiring, or reprogramming the PCM if necessary.

7. Are there any DIY tips for fixing the Cylinder 4 Injector High Control Circuit Low Voltage issue?

- DIY enthusiasts can start by inspecting the wiring and connectors for damage, checking the fuel injector resistance, and ensuring proper connection to the PCM.

8. Is it safe to drive my Chevrolet Silverado with the P2156 trouble code illuminated?

- It is not recommended to drive the vehicle extensively with this code active, as it can lead to performance issues and potential long-term damage if left unaddressed.

9. How much does it typically cost to repair OBDII code P2156 on a 2018 Chevrolet Silverado?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $150 to $500, including parts and labor.

10. Will resetting the OBDII code P2156 on my Chevrolet Silverado make it go away permanently?

- Resetting the code without addressing the underlying issue will not make it disappear permanently; the root cause must be diagnosed and repaired to prevent the code from reoccurring.