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P159C 2016 GMC Sierra Code - Power Take-Off Remote Engine Shutdown Switch Circuit

Quick Answer

The P159C diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to the Power Take-Off (PTO) Remote Engine Shutdown Switch Circuit. Common causes include Damaged wiring or connectors in the remote engine shutdown switch circuit, Corrosion or poor connections at the switch or PCM, Faulty remote engine shutdown switch. 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 2016 GMC Sierra indicates Power Take-Off Remote Engine Shutdown Switch Circuit.
Common causes
Common causes include Damaged wiring or connectors in the remote engine shutdown switch circuit, Corrosion or poor connections at the switch or PCM, Faulty remote engine shutdown switch.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 07, 2024
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Code P159C 2016 GMC Sierra Description

The P159C diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to the Power Take-Off (PTO) Remote Engine Shutdown Switch Circuit. This code indicates a problem with the circuit that is responsible for controlling the remote engine shutdown feature in vehicles equipped with a power take-off system. The PTO system allows the engine to provide power to auxiliary equipment, such as hydraulic pumps or generators, while the vehicle is stationary. The remote engine shutdown switch is a safety feature that allows the operator to turn off the engine from a distance in case of an emergency.

OBDII Code P159C 2016 GMC Sierra - Power Take-Off Remote Engine Shutdown Switch Circuit
P159C 2016 GMC Sierra Code - Power Take-Off Remote Engine Shutdown Switch Circuit

Common Causes of P159C 2016 GMC Sierra

  1. Damaged wiring or connectors in the remote engine shutdown switch circuit
  2. Corrosion or poor connections at the switch or PCM
  3. Faulty remote engine shutdown switch
  4. Communication errors between the switch and PCM
  5. Defective PCM

Symptoms of P159C 2016 GMC Sierra

  1. Inability to remotely shut off the engine
  2. Warning light illuminated on the dashboard
  3. Loss of communication with the remote engine shutdown switch
  4. Vehicle stalling when attempting to engage the PTO system

How to Fix P159C 2016 GMC Sierra

  1. Begin by inspecting the wiring harness and connectors for any visible damage or corrosion. Repair or replace any damaged components.
  2. Check the remote engine shutdown switch for proper operation. Test the switch using a multimeter to ensure it is functioning correctly.
  3. Verify proper communication between the switch and PCM. Use a scan tool to check for any communication errors and address any issues found.
  4. If all components check out, consider replacing the PCM as a last resort if no other faults are found.
  5. Clear the DTC and test the vehicle to ensure the issue has been resolved.

Cost to Fix P159C 2016 GMC Sierra

The cost of repairing a P159C code for a 2016 GMC Sierra will vary depending on the specific cause of the issue. In general, the cost of parts for this repair could range from $50 to $200, with labor costs adding an additional $80 to $150 per hour. Overall, the total cost of addressing this issue could range from $150 to $500, depending on the extent of the repairs needed. It is important to note that these estimates are rough guidelines, and actual costs may vary based on factors such as location, vehicle make and model, and the specific repair shop used. It is recommended to obtain a detailed quote from a qualified technician before proceeding with any repairs.

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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 2016 GMC Sierra Code

1. What does the OBDII code P159C mean on a 2016 GMC Sierra?

P159C refers to an issue with the Power Take-Off (PTO) Remote Engine Shutdown Switch Circuit, indicating a fault in the system responsible for remotely shutting down the engine during PTO operation.

2. What are the common symptoms of the P159C code?

Symptoms may include the inability to use the PTO system, the engine not shutting down remotely as intended, the check engine light illuminating, or stored diagnostic trouble codes in the system.

3. What causes the P159C code to appear?

Common causes include a faulty PTO remote engine shutdown switch, damaged wiring or connectors in the switch circuit, or a failure in the Powertrain Control Module (PCM).

4. Can I still drive my 2016 GMC Sierra with the P159C code?

Yes, the vehicle can usually still be driven, but the PTO functionality may be compromised. It’s best to address the issue to avoid further problems.

5. How can I diagnose the P159C code?

Diagnosis involves inspecting the PTO remote engine shutdown switch, checking for damaged or disconnected wiring, and using a scan tool to monitor the circuit’s signal and test the PCM.

6. How do I fix the P159C code?

Repairs may include replacing the faulty PTO remote engine shutdown switch, repairing or replacing damaged wiring or connectors, or reprogramming/updating the PCM if necessary.

7. What tools are needed to troubleshoot the P159C code?

You’ll need an OBDII scan tool, a multimeter to test electrical connections, and wiring diagrams for the PTO system on the 2016 GMC Sierra.

8. Can a bad PCM cause the P159C code?

Yes, although less common, a malfunctioning PCM can cause the P159C code if it fails to process the PTO remote engine shutdown signals correctly.

9. Is the P159C code specific to the GMC Sierra?

No, the P159C code can also appear in other GM vehicles equipped with PTO systems, but the troubleshooting and repair process may vary slightly.

10. How much does it cost to repair the P159C code?

The cost depends on the root cause. Replacing a PTO remote engine shutdown switch typically costs $50–$200 for parts and labor, while PCM repairs or updates may range from $150 to $1,000.

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