AutoCodes – GMC – P0615 GMC

P0615 GMC 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 GMC 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 1,093

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 GMC 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 GMC - Start Signal Circuit - AutoCodes.com — P0615 GMC Code - Start Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P0615 GMC?

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 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 P0615 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 P0615 GMC code?

Need more information on how to fix the P0615 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P0615 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P0615 2014 GMC Sierra — Start Signal Circuit
P0615 2015 GMC Sierra — Start Signal Circuit
P0615 2016 GMC Sierra — Start Signal Circuit
P0615 2017 GMC Sierra — Start Signal Circuit
P0615 2018 GMC Sierra — Start Signal Circuit

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 GMC Code

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

P0615 on a GMC indicates a problem with the Start Signal Circuit, which involves the communication between the starter relay, PCM (Powertrain Control Module), and ignition system.

2. What are common symptoms of the P0615 code on a GMC?

Symptoms include a no-start condition, intermittent starting issues, illuminated check engine light, or clicking sounds when attempting to start the engine.

3. What causes the P0615 code on a GMC?

Common causes include a faulty starter relay, damaged wiring or connectors in the start signal circuit, a failing PCM, or issues with the ignition switch.

4. How can I diagnose the P0615 code on my GMC?

Start by visually inspecting the wiring and connectors in the start signal circuit. Use a multimeter to test the starter relay and check for continuity in the circuit. Scan the PCM for related codes.

5. Can a bad battery cause the P0615 code on a GMC?

Yes, a weak or dead battery can lead to insufficient voltage in the start signal circuit, potentially triggering the P0615 code.

6. How do I fix the P0615 code on a GMC?

Repairs may include replacing a faulty starter relay, repairing damaged wiring, tightening loose connections, or reprogramming/replacing the PCM if itâ€™s defective.

7. Is it safe to drive with the P0615 code on a GMC?

Driving may not be possible if the vehicle wonâ€™t start. Even if it starts intermittently, addressing the issue promptly is recommended to avoid being stranded.

8. How much does it cost to repair the P0615 code on a GMC?

Repair costs vary depending on the cause. Replacing a starter relay typically costs $50-$150, while PCM replacement or repairs can range from $500-$1,200.

9. Can I clear the P0615 code without fixing the problem?

While the code can be cleared temporarily with a scan tool, the underlying issue must be resolved to prevent the code from returning.

10. Do I need a professional mechanic to fix the P0615 code on my GMC?

If youâ€™re comfortable with basic electrical diagnostics and repairs, you can attempt to fix it yourself. However, for PCM-related issues, professional assistance is recommended.