AutoCodes – GMC – P0615 2016 GMC Sierra

P0615 2016 GMC Sierra Code - Start Signal Circuit

Quick Answer

When the ignition switch is placed in the START position, a discrete signal is supplied to the Body Control Module (BCM) notifying it that the ignition is in the START position. Common causes include Faulty Starter Relay, Starter Relay harness is open or shorted, Starter Relay 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: P0615 2016 GMC Sierra indicates Start Signal Circuit.
Common causes: Common causes include Faulty Starter Relay, Starter Relay harness is open or shorted, Starter Relay 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 226

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0615 2016 GMC Sierra Description

When the ignition switch is placed in the START position, a discrete signal is supplied to the Body Control Module (BCM) notifying it that the ignition is in the START position. The BCM then sends a message to the Engine Control Module (ECM) that a crank has been requested. The ECM then verifies that the clutch pedal is depressed, or the transmission is in Park/Neutral. If it is, the ECM then supplies 12 V to the control circuit of the starter relay. When this occurs, battery voltage is supplied through the switch of the starter relay to the starter solenoid. The Diagnostic Trouble Code (DTC) will be set when the ECM detects improper voltage on the control circuit of the starter relay.

OBDII Code P0615 2016 GMC Sierra - Start Signal Circuit - AutoCodes.com — P0615 2016 GMC Sierra Code - Start Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P0615 2016 GMC Sierra?

Faulty Starter Relay
Starter Relay harness is open or shorted
Starter Relay circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0615 2016 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 P0615 2016 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 P0615 2016 GMC Sierra code?

Need more information on how to fix the P0615 2016 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 P0615 2016 GMC Sierra Code

1. What does the OBDII code P0615 mean on a 2016 GMC Sierra?

P0615 indicates an issue with the Start Signal Circuit, meaning the Engine Control Module (ECM) is not detecting the proper signal for the starter relay to engage.

2. What are the common symptoms of the P0615 code in a 2016 GMC Sierra?

Symptoms may include the engine not starting, a no-crank condition, illuminated check engine light, or intermittent starting issues.

3. What causes the P0615 code to appear in a 2016 GMC Sierra?

Potential causes include a faulty starter relay, damaged wiring or connectors in the start signal circuit, a malfunctioning ignition switch, or issues with the ECM.

4. Can the P0615 code cause a 2016 GMC Sierra to not start at all?

Yes, the P0615 code can prevent the engine from starting if the ECM cannot detect the proper start signal.

5. How do you diagnose the P0615 code on a 2016 GMC Sierra?

Diagnosis involves checking the starter relay, inspecting wiring and connectors for damage, testing the ignition switch, and verifying the ECM's functionality using a scan tool.

6. Can a weak battery trigger the P0615 code in a 2016 GMC Sierra?

While unlikely, a weak or dead battery can cause starting issues that might be mistaken for a P0615-related problem. Always check the battery first.

7. How is the P0615 code fixed on a 2016 GMC Sierra?

Repairs may include replacing the starter relay, repairing damaged wiring or connectors, replacing the ignition switch, or reprogramming or replacing the ECM if necessary.

8. Is it safe to drive a 2016 GMC Sierra with the P0615 code?

If the engine starts, the vehicle may still be drivable, but itâ€™s recommended to address the issue promptly to avoid being stranded.

9. What tools are needed to troubleshoot the P0615 code in a 2016 GMC Sierra?

Tools may include a digital multimeter, a scan tool or OBDII scanner, and basic hand tools for inspecting and replacing components.

10. Can the P0615 code clear itself after a repair is made?

In some cases, the code may clear automatically after resolving the issue, but itâ€™s best to use a scan tool to clear the code and verify the repair.