AutoCodes – GMC – P1915 2015 GMC Sierra

P1915 2015 GMC Sierra Code - Internal Mode Switch Start/Wrong Range

Quick Answer

The park/neutral position switch and the 5 Hall Effect switches are internal to and part of the internal mode switch assembly. Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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: P1915 2015 GMC Sierra indicates Internal Mode Switch Start/Wrong Range.
Common causes: Common causes include Faulty Transmission Internal Mode Switch, Transmission Internal Mode Switch harness is open or shorted, Transmission Internal Mode Switch 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 227

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 Mar 23, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1915 2015 GMC Sierra Description

The park/neutral position switch and the 5 Hall Effect switches are internal to and part of the internal mode switch assembly. The park/neutral switch indicates to the engine control module (ECM) if the vehicle is in park/neutral or in a drive gear range. With the ignition ON, the ECM provides 12 V on the park/neutral signal to the park/neutral position switch. A separate ground wire from the park/neutral position switch to the Transmission Control Module (TCM) completes the path to ground. When the gear shift lever in park or neutral, the switch closes and drops the voltage on the signal circuit to 0 V. In this state the engine will start and run. In reverse or drive range the park/neutral switch opens, 12 V is then present on the signal circuit which will inhibit engine starting. The Diagnostic Trouble Code (DTC) will be set when the internal mode switch Park/Neutral circuit does indicate Park or Neutral during engine start.

OBDII Code P1915 2015 GMC Sierra - Internal Mode Switch Start/Wrong Range - AutoCodes.com — P1915 2015 GMC Sierra Code - Internal Mode Switch Start/Wrong Range

What does this mean?

What are the Possible Causes of the DTC P1915 2015 GMC Sierra?

Faulty Transmission Internal Mode Switch
Transmission Internal Mode Switch harness is open or shorted
Transmission Internal Mode Switch circuit poor electrical connection
Faulty Transmission Control Module (TCM)

How to Fix the DTC P1915 2015 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 P1915 2015 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 P1915 2015 GMC Sierra code?

Need more information on how to fix the P1915 2015 GMC Sierra code? Get Access to Factory Service Manuals

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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 P1915 2015 GMC Sierra Code

What does OBDII code P1915 mean for a 2015 GMC Sierra?

Code P1915 refers to "Internal Mode Switch Start/Wrong Range," indicating an issue with the transmission range sensor or internal mode switch.

What are the symptoms of code P1915 in a 2015 GMC Sierra?

Symptoms may include difficulty starting the vehicle, incorrect gear selection, transmission slipping, or the Check Engine Light being illuminated.

What causes code P1915 in a 2015 GMC Sierra?

Common causes include a faulty transmission range sensor, wiring issues, corroded or damaged connectors, or internal transmission problems.

Can driving with code P1915 damage the vehicle?

Driving with this code may lead to further transmission issues or unsafe driving conditions due to improper gear selection. It's recommended to address it promptly.

How do I diagnose code P1915 on a 2015 GMC Sierra?

Start by scanning for additional codes, inspecting the transmission range sensor and wiring, and verifying gear selection with a diagnostic tool.

Can code P1915 be fixed without replacing parts?

In some cases, cleaning corroded connectors or repairing damaged wiring may resolve the issue without replacing components.

How much does it cost to repair code P1915 on a 2015 GMC Sierra?

Repair costs vary but may range from $150 for minor wiring repairs to over $500 if the transmission range sensor or internal components need replacement.

Is code P1915 specific to GMC vehicles?

No, P1915 can appear on other vehicles with similar transmission systems, but the troubleshooting steps may vary by manufacturer.

Do I need professional help to fix code P1915 on my 2015 GMC Sierra?

While basic troubleshooting like inspecting connectors can be done by DIYers, diagnosing and repairing internal transmission issues often requires professional expertise.

What tools are needed to troubleshoot code P1915?

You’ll need an OBDII scanner, a multimeter to test wiring and connectors, and possibly specialized transmission diagnostic tools for further inspection.