AutoCodes – GMC – P159D 2015 GMC Sierra

P159D 2015 GMC Sierra Code - Power Take-Off Remote Mode Switch Circuit

Quick Answer

The Power Take-Off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. Common causes include Faulty Power Take-Off (PTO) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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: P159D 2015 GMC Sierra indicates Power Take-Off Remote Mode Switch Circuit.
Common causes: Common causes include Faulty Power Take-Off (PTO) Control Module, Power Take-Off Control Module harness is open or shorted, Power Take-Off Control Module 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 191

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 Aug 16, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P159D 2015 GMC Sierra Description

The Power Take-Off (PTO) is an upfitter integrated system that allows the user to create an auxiliary power source. The PTO system specifically controls engine speed to values higher than normal base idle, PTO load relay engagement, and remote starting and shutdown of the engine. When the operator requests PTO using either the PTO switch or PTO remote, the engine RPM will increase to a default standby speed. The Engine Control Module (ECM) converts the data from the engine speed sensor to a 2 pulses/engine revolution signal. When PTO is engaged, the Power Take-Off Module (PTOM) sends a GMLAN serial data message to the ECM requesting engine speeds, in response to signals from the PTO switch or remote.
The Diagnostic Trouble Code (DTC) will be set when the Power Take-Off Control Module detects a signal mismatch between the remote engine shut-off signal and the PTO engine shutdown signal.

OBDII Code P159D 2015 GMC Sierra - Power Take-Off Remote Mode Switch Circuit - AutoCodes.com — P159D 2015 GMC Sierra Code - Power Take-Off Remote Mode Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P159D 2015 GMC Sierra?

Faulty Power Take-Off (PTO) Control Module
Power Take-Off Control Module harness is open or shorted
Power Take-Off Control Module circuit poor electrical connection

How to Fix the DTC P159D 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 P159D 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 P159D 2015 GMC Sierra code?

Need more information on how to fix the P159D 2015 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P159D 2015 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P159D 2015 GMC Sierra Code

1. What does the OBDII code P159D mean on a 2015 GMC Sierra?

The P159D code indicates a problem with the Power Take-Off (PTO) Remote Mode Switch Circuit, which is part of the system used to operate auxiliary equipment like hydraulic pumps or generators.

2. What are the common symptoms of the P159D code?

Symptoms include the PTO system not engaging, warning lights on the dashboard, or erratic PTO operation.

3. What causes the P159D code to appear on a 2015 GMC Sierra?

Causes can include a faulty PTO remote mode switch, damaged wiring or connectors, or a failure in the Powertrain Control Module (PCM).

4. How do I diagnose the P159D code on my truck?

Check the PTO switch and wiring for damage, test circuit continuity, and use a scan tool to monitor the PTO switch input signal to the PCM.

5. Can I still drive my 2015 GMC Sierra with the P159D code?

Yes, the truck can usually be driven safely, but the PTO system may not function properly until the issue is resolved.

6. How do I fix the P159D code on my GMC Sierra?

Repair or replace the PTO remote mode switch, fix any damaged wiring or connectors, and clear the code with a scan tool.

7. How much does it cost to repair the P159D code?

Repair costs can vary depending on the issue but typically range from $100 to $300 for parts and labor if the switch or wiring needs replacement.

8. Can a bad PCM cause the P159D code?

Yes, though it's less common, a malfunctioning PCM could cause the code if it fails to properly interpret the PTO switch signal.

9. What tools do I need to troubleshoot the P159D code?

Youâ€™ll need a scan tool with OBDII capabilities, a multimeter for testing electrical circuits, and potentially a wiring diagram for the PTO system.

10. How do I prevent the P159D code from recurring?

Regularly inspect and maintain the PTO switch, wiring, and connectors, especially if the truck is used in harsh environments or for heavy-duty applications.