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Engine-Codes – GMC – P162C 2018 GMC Sierra

P162C 2018 GMC Sierra Code - Vehicle Speed Limiting/Warning Switch Circuit

Quick Answer

The diagnostic trouble code P162C in a 2018 GMC Sierra refers to an issue with the Vehicle Speed Limiting/Warning Switch Circuit. Common causes include Damaged wiring or connectors in the speed limiting/ warning switch circuit, Faulty speed sensor, Malfunctioning control module. 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 2018 GMC Sierra indicates Vehicle Speed Limiting/Warning Switch Circuit.
Common causes
Common causes include Damaged wiring or connectors in the speed limiting/ warning switch circuit, Faulty speed sensor, Malfunctioning control module.
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 2018 GMC Sierra Description

The diagnostic trouble code P162C in a 2018 GMC Sierra refers to an issue with 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 limit for safety reasons, while warning systems alert the driver when they exceed a certain speed threshold.

OBDII Code P162C 2018 GMC Sierra - Vehicle Speed Limiting/Warning Switch Circuit
P162C 2018 GMC Sierra Code - Vehicle Speed Limiting/Warning Switch Circuit

Common Causes of P162C 2018 GMC Sierra

  1. Damaged wiring or connectors in the speed limiting/ warning switch circuit
  2. Faulty speed sensor
  3. Malfunctioning control module
  4. Software glitch in the vehicle's onboard computer system

Symptoms of P162C 2018 GMC Sierra

  1. Inaccurate speed readings on the dashboard
  2. Inability to set or adjust speed limiting settings
  3. Lack of warning alerts for exceeding speed limits
  4. Erratic behavior of the vehicle's speed control system

How to Fix P162C 2018 GMC Sierra

  1. Perform a comprehensive diagnostic scan to retrieve the trouble codes and pinpoint the exact cause of the issue.
  2. Inspect the wiring and connectors in the speed limiting/ warning switch circuit for any damage or corrosion.
  3. Test the speed sensor to ensure it is functioning correctly and providing accurate data.
  4. Check the control module for any signs of malfunction and reprogram or replace it if necessary.
  5. Reset the vehicle's onboard computer system to clear the trouble code and recalibrate the speed limiting/ warning switch circuit.

Cost to Fix P162C 2018 GMC Sierra

The typical repair costs for addressing the P162C code in a 2018 GMC Sierra can vary depending on the specific cause of the issue. On average, the repair may range from $200 to $500, including parts and labor. However, it's important to note that the actual cost can be higher or lower based on factors such as the location of the repair shop, the vehicle's make and model, and the extent of the repairs needed. Diagnostic time and labor rates at auto repair shops typically range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. It's recommended to obtain quotes from local shops for a more accurate estimate.

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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 2018 GMC Sierra Code

1. What does the OBDII code P162C mean on a 2018 GMC Sierra?

P162C indicates an issue with the Vehicle Speed Limiting/Warning Switch Circuit, which is responsible for monitoring or controlling the vehicle's speed limiter functions.

2. What are the common symptoms of code P162C in a 2018 GMC Sierra?

Symptoms may include the activation of the check engine light, reduced engine performance, inability to exceed a certain speed, or erratic speed limiter behavior.

3. What causes the P162C code to appear?

Common causes include a faulty speed limiting switch, damaged wiring or connectors in the circuit, a malfunctioning ECM (Engine Control Module), or software issues.

4. How can I diagnose code P162C on my GMC Sierra?

Start by scanning the vehicle with an OBDII scanner to confirm the code, then visually inspect the wiring and connectors for damage. Use a multimeter to test the speed limiting switch and circuit for proper operation.

5. Can I drive my 2018 GMC Sierra with the P162C code active?

Driving is possible, but it may be limited by reduced speed or performance. It’s best to address the issue promptly to avoid further complications.

6. How do I fix the P162C code on a GMC Sierra?

Repairs may include replacing a faulty speed limiting switch, repairing damaged wiring, updating the ECM software, or replacing the ECM if necessary.

7. Is the P162C code related to my vehicle’s speed limiter settings?

Yes, the code is directly related to the system that controls or monitors the speed limiter, which may be malfunctioning or not communicating properly.

8. How much does it cost to fix the P162C code on a GMC Sierra?

Repair costs vary depending on the cause but can range from $100 for minor wiring repairs to over $1,000 if ECM replacement is required.

9. Can a software update fix the P162C code in my 2018 GMC Sierra?

Yes, if the issue is related to outdated or corrupted ECM software, a dealer-performed software update may resolve the problem.

10. What tools are needed to troubleshoot the P162C code?

You’ll need an OBDII scanner, a multimeter for circuit testing, and possibly access to GMC-specific diagnostic software for deeper analysis.

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