AutoCodes – GMC – P159D 2017 GMC Sierra

P159D 2017 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 2017 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.

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Code Popularity 250

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
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Code P159D 2017 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 2017 GMC Sierra - Power Take-Off Remote Mode Switch Circuit - AutoCodes.com — P159D 2017 GMC Sierra Code - Power Take-Off Remote Mode Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P159D 2017 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 2017 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 2017 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.

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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 P159D 2017 GMC Sierra Code

1. What does the OBDII code P159D mean on a 2017 GMC Sierra?

P159D indicates an issue with the Power Take-Off (PTO) Remote Mode Switch Circuit, which is responsible for controlling auxiliary power equipment.

2. What are the symptoms of code P159D in a 2017 GMC Sierra?

Common symptoms include the PTO not engaging or working properly, the check engine light turning on, and possible loss of auxiliary power function.

3. What causes the P159D code to appear in a 2017 GMC Sierra?

Potential causes include a faulty PTO remote mode switch, damaged wiring or connectors in the circuit, or a malfunctioning Powertrain Control Module (PCM).

4. How do I diagnose the P159D code on my 2017 GMC Sierra?

Start by inspecting the PTO remote mode switch and its wiring for damage or loose connections. Then use a scan tool to monitor PTO circuit data and ensure the switch is sending the correct signals.

5. Can I still drive my 2017 GMC Sierra with the P159D code active?

Yes, you can typically drive the truck, but the PTO system may not function properly, which can be problematic if you rely on it for auxiliary equipment.

6. How can I fix the P159D code on a 2017 GMC Sierra?

Repair or replace any damaged wiring or connectors in the PTO circuit. If the switch itself is faulty, replace it. If the issue persists, the PCM may need to be reprogrammed or replaced.

7. How much does it cost to fix the P159D code on a 2017 GMC Sierra?

The cost depends on the root cause. Replacing the PTO switch typically costs $50-$150 for parts and labor, while repairing wiring or replacing the PCM could cost significantly more.

8. Can a faulty PTO switch cause the P159D code?

Yes, a malfunctioning PTO remote mode switch is a common cause of the P159D code.

9. Does the P159D code affect the engine's performance?

No, this code specifically relates to the PTO system and does not directly affect the engine's performance.

10. Do I need special tools to repair the P159D code on my 2017 GMC Sierra?

You may need a scan tool to monitor the PTO circuit, a multimeter to check wiring continuity, and basic hand tools for inspecting and replacing components.