AutoCodes – GMC – P159C 2014 GMC Sierra

P159C 2014 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 2014 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 134

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 2014 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 2014 GMC Sierra - Power Take-Off Remote Engine Shutdown Switch Circuit - AutoCodes.com — P159C 2014 GMC Sierra Code - Power Take-Off Remote Engine Shutdown Switch Circuit

What does this mean?

What are the Possible Causes of the DTC P159C 2014 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 2014 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 2014 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 2014 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 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P159C in a 2014 GMC Sierra?

- Common symptoms include the inability to engage the power take-off (PTO) system, a malfunctioning remote engine shutdown switch, and an illuminated check engine light.

2. What is the likely cause of OBDII code P159C in a 2014 GMC Sierra?

- The most likely cause of code P159C is a fault in the power take-off (PTO) remote engine shutdown switch circuit, which can be due to wiring issues, a defective switch, or a communication problem.

3. How can I diagnose the P159C code in my 2014 GMC Sierra?

- Diagnosis involves checking the integrity of the PTO remote engine shutdown switch circuit, inspecting the wiring for any damage or corrosion, and testing the switch for proper functionality.

4. Can I still drive my 2014 GMC Sierra with OBDII code P159C?

- It is generally safe to drive the vehicle with code P159C, but you may experience issues with the power take-off system and the remote engine shutdown switch. It is recommended to address the problem promptly.

5. How can I repair OBDII code P159C in my 2014 GMC Sierra?

- Repairing code P159C involves fixing any wiring issues, replacing a faulty remote engine shutdown switch if necessary, and clearing the trouble code with a diagnostic scanner.

6. Are there any DIY tips for troubleshooting code P159C in a 2014 GMC Sierra?

- DIY tips include visually inspecting the wiring for damage, ensuring the connections are secure, and testing the remote engine shutdown switch for continuity or proper operation.

7. Will resetting the OBDII system clear code P159C in my 2014 GMC Sierra?

- Resetting the OBDII system may temporarily clear the code, but if the underlying issue with the power take-off remote engine shutdown switch circuit is not addressed, the code is likely to reappear.

8. Is OBDII code P159C a common issue in 2014 GMC Sierra trucks?

- While not extremely common, code P159C related to the power take-off remote engine shutdown switch circuit can occur in 2014 GMC Sierra trucks, particularly in vehicles with PTO systems.

9. Can a malfunctioning power take-off system affect the overall performance of my 2014 GMC Sierra?

- A malfunctioning power take-off system due to code P159C can impact the functionality of certain vehicle operations, specifically those related to the PTO and the remote engine shutdown switch.

10. Should I seek professional help to fix OBDII code P159C in my 2014 GMC Sierra?

- If you are not confident in diagnosing and repairing electrical issues, it is advisable to seek professional assistance to properly address code P159C in your 2014 GMC Sierra.