P159C 2017 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 2017 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.
Code P159C 2017 GMC Sierra Description
The Diagnostic Trouble Code (DTC) will be set when the ECM detects a fault on the PTO remote engine shutdown switch circuit.
What are the Possible Causes of the DTC P159C 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
- Faulty Engine Control Module (ECM)
How to Fix the DTC P159C 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 P159C 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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Frequently Asked Questions about P159C 2017 GMC Sierra Code
1. What does the OBDII code P159C mean on a 2017 GMC Sierra?
P159C indicates an issue with the Power Take-Off (PTO) Remote Engine Shutdown Switch Circuit, which is responsible for controlling engine shutdown during PTO operation.
2. What are the common symptoms of code P159C in a 2017 GMC Sierra?
Symptoms may include the engine shutting off unexpectedly during PTO engagement, the PTO system not functioning, or an illuminated Check Engine Light.
3. What causes the P159C code to appear?
Common causes include a faulty PTO Remote Engine Shutdown Switch, damaged wiring or connectors in the circuit, or a malfunctioning Powertrain Control Module (PCM).
4. How can I diagnose the P159C code in my 2017 GMC Sierra?
Start by visually inspecting the PTO switch, wiring, and connectors for damage. Use a scan tool to monitor the PTO circuit and check if the switch is functioning correctly.
5. Can I drive my 2017 GMC Sierra with the P159C code active?
While the truck may still be drivable, the PTO system might not work as intended, and engine shutdowns could occur unexpectedly. It is recommended to address the issue promptly.
6. How do you fix the P159C code on a 2017 GMC Sierra?
Repairs typically involve replacing a faulty PTO Remote Engine Shutdown Switch, repairing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to fix the P159C code in a 2017 GMC Sierra?
Repair costs can vary, but replacing the PTO switch or repairing wiring typically ranges from $100 to $300, while PCM replacement can be more expensive.
8. Can a dead battery cause the P159C code to appear?
A weak or dead battery can cause electrical issues, but it is not a common cause of this specific code. However, ensure the battery is fully charged during diagnosis.
9. What tools are needed to diagnose the P159C code?
You’ll need a scan tool capable of reading live data, a multimeter for testing the circuit, and possibly wiring diagrams for the PTO system.
10. Will clearing the P159C code fix the problem?
Clearing the code will reset the Check Engine Light, but if the underlying issue isn’t resolved, the code will return after a few drive cycles.
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