AutoCodes – Cadillac – P0615 Cadillac

P0615 Cadillac 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 Cadillac 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 1,124

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 Jul 15, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0615 Cadillac 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 Cadillac - Start Signal Circuit - AutoCodes.com — P0615 Cadillac Code - Start Signal Circuit

What does this mean?

What are the Possible Causes of the DTC P0615 Cadillac?

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 Cadillac?

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 Cadillac 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.

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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 Cadillac Code

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

P0615 indicates an issue with the Start Signal Circuit, which involves the communication between the ignition switch, starter, and engine control module (ECM).

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

Symptoms may include the engine failing to start, intermittent starting issues, or no response when turning the ignition key or pressing the start button.

3. What causes the P0615 code to appear on a Cadillac?

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

4. Can a low battery cause the P0615 code on a Cadillac?

Yes, a weak or discharged battery can result in insufficient voltage to the start signal circuit, triggering the P0615 code.

5. How do you diagnose the P0615 code on a Cadillac?

Diagnosis typically involves inspecting the battery, fuses, starter relay, wiring, and connections for damage or corrosion, as well as testing the ignition switch and ECM functionality.

6. Can I drive my Cadillac if it has a P0615 code?

If the engine starts, the vehicle may still be drivable, but starting issues could worsen over time. Itâ€™s best to address the problem promptly to avoid being stranded.

7. How do you fix the P0615 code on a Cadillac?

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

8. How much does it cost to fix the P0615 code on a Cadillac?

Repair costs vary depending on the issue. Replacing a starter relay may cost $50-$150, while ECM replacement or reprogramming can range from $300 to $1,000 or more.

9. Can a faulty starter motor trigger the P0615 code on a Cadillac?

While the starter motor itself is not typically the direct cause of P0615, issues with its relay or connections can contribute to the code.

10. How can I prevent the P0615 code from occurring on my Cadillac?

Regular maintenance, including checking the battery, inspecting wiring and connectors, and ensuring the starter system is in good condition, can help prevent this code.