AutoCodes – GMC – P159C 2018 GMC Sierra

P159C 2018 GMC Sierra Code - Power Take-Off Remote Engine Shutdown 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: P159C 2018 GMC Sierra indicates Power Take-Off Remote Engine Shutdown 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 162

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 P159C 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 control module sends a 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 ECM detects a fault on the PTO remote engine shutdown switch circuit.

OBDII Code P159C 2018 GMC Sierra - Power Take-Off Remote Engine Shutdown Switch Circuit - AutoCodes.com — P159C 2018 GMC Sierra Code - Power Take-Off Remote Engine Shutdown Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P159C 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
Faulty Engine Control Module (ECM)

How to Fix the DTC P159C 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 P159C 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 P159C 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 P159C 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P159C in a 2018 GMC Sierra?

The common symptoms of code P159C include malfunctioning power take-off (PTO) remote engine shutdown switch, illuminated warning lights on the dashboard, and possible engine performance issues.

2. What does the OBDII code P159C mean in a 2018 GMC Sierra?

OBDII code P159C in a 2018 GMC Sierra indicates a malfunction in the Power Take-Off (PTO) remote engine shutdown switch circuit.

3. What are the possible causes of OBDII code P159C in a 2018 GMC Sierra?

Possible causes of code P159C include a faulty PTO remote engine shutdown switch, damaged wiring or connectors in the circuit, or a malfunctioning control module.

4. How can I diagnose the OBDII code P159C in my 2018 GMC Sierra?

To diagnose code P159C, you can use an OBDII scanner to retrieve the code and perform a visual inspection of the PTO remote engine shutdown switch circuit for any visible damage or loose connections.

5. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P159C?

It is not recommended to continue driving your 2018 GMC Sierra with OBDII code P159C, as the malfunctioning PTO remote engine shutdown switch may lead to potential safety hazards or further damage to the vehicle.

6. How can I repair OBDII code P159C in my 2018 GMC Sierra?

Repairing OBDII code P159C may involve replacing the faulty PTO remote engine shutdown switch, repairing any damaged wiring or connectors in the circuit, or resetting the control module after addressing the underlying issue.

7. Can I reset the OBDII code P159C in my 2018 GMC Sierra without fixing the underlying problem?

While you can clear the code with an OBDII scanner, it is important to address the root cause of code P159C in your 2018 GMC Sierra to prevent the issue from recurring and ensure the proper functioning of the PTO remote engine shutdown switch.

8. Will OBDII code P159C cause my 2018 GMC Sierra to fail an emissions test?

OBDII code P159C may cause your 2018 GMC Sierra to fail an emissions test, as it indicates a malfunction in the PTO remote engine shutdown switch circuit, which can affect the vehicle's overall emissions control system.

9. How much does it typically cost to repair OBDII code P159C in a 2018 GMC Sierra?

The cost to repair OBDII code P159C in a 2018 GMC Sierra can vary depending on the underlying issue, but it may range from a few hundred to over a thousand dollars, including parts and labor.

10. Can I fix OBDII code P159C in my 2018 GMC Sierra myself, or should I seek professional help?

While some DIY enthusiasts may attempt to diagnose and repair OBDII code P159C in a 2018 GMC Sierra, it is recommended to seek professional help, especially if you are not experienced in dealing with automotive electrical systems.