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Engine-Codes – GMC – P162C 2016 GMC Sierra

P162C 2016 GMC Sierra Code - Vehicle Speed Limiting/Warning Switch Circuit

Quick Answer

The P162C diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Vehicle Speed Limiting/Warning Switch Circuit. Common causes include Faulty vehicle speed sensor, Wiring or connector issues in the speed limiting/ warning circuit, Defective speed limiting/ warning 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
P162C 2016 GMC Sierra indicates Vehicle Speed Limiting/Warning Switch Circuit.
Common causes
Common causes include Faulty vehicle speed sensor, Wiring or connector issues in the speed limiting/ warning circuit, Defective speed limiting/ warning 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 13, 2024
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Code P162C 2016 GMC Sierra Description

The P162C diagnostic trouble code (DTC) for a 2016 GMC Sierra relates to the Vehicle Speed Limiting/Warning Switch Circuit. This code indicates that there is a malfunction in the circuit responsible for controlling the vehicle's speed limiting or warning system. In modern vehicles, speed limiting systems are designed to restrict the vehicle's speed to a predetermined maximum limit, often for safety or regulatory compliance reasons. The warning system, on the other hand, alerts the driver when the vehicle exceeds a certain speed threshold.

OBDII Code P162C 2016 GMC Sierra - Vehicle Speed Limiting/Warning Switch Circuit
P162C 2016 GMC Sierra Code - Vehicle Speed Limiting/Warning Switch Circuit

Common Causes of P162C 2016 GMC Sierra

  1. Faulty vehicle speed sensor
  2. Wiring or connector issues in the speed limiting/ warning circuit
  3. Defective speed limiting/ warning switch
  4. Malfunctioning engine control module (ECM)
  5. Software glitches in the vehicle's control systems

Symptoms of P162C 2016 GMC Sierra

  1. Inaccurate speed limiting function
  2. Failure of the warning system to alert the driver
  3. Limp mode activation
  4. Check Engine Light illuminated
  5. Reduced vehicle performance

How to Fix P162C 2016 GMC Sierra

  1. Begin by conducting a thorough inspection of the vehicle's speed limiting/ warning circuit, including the speed sensor, wiring, connectors, and switch.
  2. Use a diagnostic scanner to retrieve and clear the DTC, then test the system to identify the specific component causing the issue.
  3. Replace any faulty components identified during testing, such as the speed sensor, switch, or ECM.
  4. Clear the DTC from the vehicle's memory and test the system to ensure the issue has been resolved.
  5. Conduct a road test to verify that the speed limiting and warning systems are functioning correctly under normal driving conditions.

Cost to Fix P162C 2016 GMC Sierra

The typical repair costs for addressing the P162C code on a 2016 GMC Sierra can vary depending on the specific cause of the issue and the cost of parts and labor. In general, the repair for this type of circuit-related problem may range from $150 to $500, including parts and labor. However, it is essential to note that diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. It is advisable to check with local auto repair shops for a more accurate estimate based on the specific circumstances. Keep in mind that rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing.

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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 P162C 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P162C in a 2016 GMC Sierra?

- Common symptoms include the vehicle speed being limited, a warning message displayed on the dashboard, and the inability to accelerate beyond a certain speed.

2. What causes the OBDII code P162C in a 2016 GMC Sierra?

- This code is typically triggered by a fault in the vehicle speed limiting/warning switch circuit, which can be caused by wiring issues, a faulty switch, or a malfunctioning control module.

3. How can I diagnose the vehicle speed limiting/ warning switch circuit issue in my 2016 GMC Sierra?

- You can start by checking the wiring connections, inspecting the switch for any visible damage, and using a diagnostic scanner to pinpoint the exact location of the fault.

4. Is it safe to continue driving my 2016 GMC Sierra with OBDII code P162C active?

- It is not recommended to drive the vehicle with this code active, as the speed limitation and warning message can affect the vehicle's performance and safety.

5. Can I reset the OBDII code P162C in my 2016 GMC Sierra myself?

- While you can clear the code using an OBDII scanner, it is important to diagnose and fix the underlying issue causing the code to prevent it from reoccurring.

6. How much does it typically cost to repair OBDII code P162C in a 2016 GMC Sierra?

- The cost of repair can vary depending on the root cause of the issue, but it may involve replacing a faulty switch, repairing wiring, or reprogramming the control module, with costs ranging from $100 to $500 or more.

7. Can a DIY enthusiast fix the vehicle speed limiting/ warning switch circuit issue in a 2016 GMC Sierra?

- Depending on the individual's skill level and access to tools, DIY enthusiasts may be able to address simple wiring issues or switch replacements, but more complex repairs may require professional assistance.

8. Will OBDII code P162C cause my 2016 GMC Sierra to fail a state emissions test?

- Yes, this code can trigger a check engine light, which will likely result in a failed emissions test until the issue is resolved and the code is cleared.

9. How long does it typically take to repair OBDII code P162C in a 2016 GMC Sierra?

- The repair time can vary based on the complexity of the issue, but most cases can be resolved within a few hours to a day by a qualified mechanic.

10. Are there any recalls or technical service bulletins related to OBDII code P162C in a 2016 GMC Sierra?

- It is advisable to check with your local GMC dealership or online resources to see if there are any recalls or technical service bulletins related to this specific OBDII code for your vehicle.

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