AutoCodes – GMC – P159D 2018 GMC Sierra

P159D 2018 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 2018 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 195

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 2018 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 2018 GMC Sierra - Power Take-Off Remote Mode Switch Circuit - AutoCodes.com — P159D 2018 GMC Sierra Code - Power Take-Off Remote Mode Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P159D 2018 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 2018 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 2018 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 2018 GMC Sierra code?

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P159D in a 2018 GMC Sierra?

The common symptoms include the inability to engage the power take-off (PTO) system remotely, illuminated warning lights on the dashboard, and a potential reduction in vehicle performance.

2. What does the OBDII code P159D on a 2018 GMC Sierra indicate?

Code P159D indicates a malfunction in the Power Take-Off (PTO) remote mode switch circuit of the vehicle.

3. What are the possible causes of OBDII code P159D in a 2018 GMC Sierra?

Possible causes include a faulty remote mode switch, damaged wiring or connectors in the circuit, issues with the PTO control module, or a malfunctioning PTO engagement system.

4. How can I diagnose the Power Take-Off remote mode switch circuit issue in my 2018 GMC Sierra?

Diagnosing the problem involves conducting a thorough inspection of the remote mode switch, checking the wiring and connectors for any damage, and using a diagnostic scanner to read the fault codes stored in the vehicle's computer.

5. Can I still drive my 2018 GMC Sierra with OBDII code P159D present?

It is not recommended to continue driving the vehicle with the P159D code active, as it may lead to further damage and potentially compromise the safety and performance of the vehicle.

6. How can I repair OBDII code P159D in my 2018 GMC Sierra?

Repairing the issue may involve replacing the faulty remote mode switch, repairing or replacing damaged wiring or connectors, resetting the fault codes, and ensuring that the PTO system functions properly.

7. Is it possible to reset the OBDII code P159D in a 2018 GMC Sierra without fixing the underlying issue?

While you can clear the fault code using a diagnostic scanner, it is crucial to address the root cause of the problem to prevent the code from reappearing and ensure the proper functioning of the PTO system.

8. Are there any specific maintenance tips to prevent OBDII code P159D in a 2018 GMC Sierra?

Regularly inspecting the PTO system components, keeping the remote mode switch clean and free of debris, and addressing any wiring issues promptly can help prevent the occurrence of code P159D.

9. Can a DIY enthusiast fix the OBDII code P159D issue in a 2018 GMC Sierra?

Depending on your skill level and access to tools, some DIY enthusiasts may be able to diagnose and repair simple P159D-related issues like checking and cleaning connectors or replacing the remote mode switch. However, more complex problems may require professional assistance.

10. How long does it typically take to repair OBDII code P159D in a 2018 GMC Sierra?

The repair time can vary depending on the exact cause of the issue. Simple fixes like replacing a switch or resetting the fault code may take a short time, while more extensive repairs involving wiring or module replacements could take longer.