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P16A2 2018 GMC Sierra Code - Throttle Position Sensor Communication Circuit Performance

Quick Answer

The P16A2 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Throttle Position Sensor (TPS) Communication Circuit Performance. Common causes include Faulty Throttle Position Sensor, Damaged or corroded wiring/connectors between TPS and ECM, ECM software or hardware issues. 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
P16A2 2018 GMC Sierra indicates Throttle Position Sensor Communication Circuit Performance.
Common causes
Common causes include Faulty Throttle Position Sensor, Damaged or corroded wiring/connectors between TPS and ECM, ECM software or hardware issues.
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 17, 2024
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Code P16A2 2018 GMC Sierra Description

The P16A2 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Throttle Position Sensor (TPS) Communication Circuit Performance. The TPS is a crucial component of the vehicle's electronic throttle control system, responsible for monitoring the position of the throttle pedal and sending this information to the engine control module (ECM). The ECM uses this data to determine the appropriate fuel delivery and ignition timing for optimal engine performance.

OBDII Code P16A2 2018 GMC Sierra - Throttle Position Sensor Communication Circuit Performance
P16A2 2018 GMC Sierra Code - Throttle Position Sensor Communication Circuit Performance

Common Causes of P16A2 2018 GMC Sierra

  1. Faulty Throttle Position Sensor
  2. Damaged or corroded wiring/connectors between TPS and ECM
  3. ECM software or hardware issues
  4. Intermittent electrical connection
  5. Environmental factors such as moisture or heat affecting sensor performance

Symptoms of P16A2 2018 GMC Sierra

  1. Reduced engine power
  2. Unresponsive throttle pedal
  3. Check Engine Light illuminated
  4. Engine stalling or surging
  5. Poor fuel efficiency

How to Fix P16A2 2018 GMC Sierra

  1. Begin by conducting a thorough inspection of the TPS, wiring, and connectors for any visible damage or corrosion.
  2. Use a multimeter to test the TPS for proper voltage output and resistance values according to manufacturer specifications.
  3. Check the continuity of the wiring harness between the TPS and ECM to ensure there are no breaks or shorts.
  4. If necessary, replace the TPS and repair or replace any damaged wiring or connectors.
  5. Clear the DTC from the ECM memory and perform a test drive to verify that the issue has been resolved.

Cost to Fix P16A2 2018 GMC Sierra

The cost of repairing a Throttle Position Sensor Communication Circuit Performance issue can vary depending on the extent of the problem and the specific components that need to be replaced. In general, replacing a faulty TPS can range from $50 to $200, while the cost of labor for diagnosis and repair can add another $100 to $200. Overall, the total repair cost for this issue may fall between $150 and $400, but it's essential to consult with a qualified mechanic or dealership for a more accurate estimate based on your vehicle's make and model. Keep in mind that labor rates and parts prices can fluctuate based on location and other factors, so it's advisable to compare quotes from different repair shops before proceeding with the repair.

What does this mean?

Tech Notes for P16A2 2018 GMC Sierra









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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 P16A2 2018 GMC Sierra Code

1. What does the OBDII code P16A2 mean on a 2018 GMC Sierra?

P16A2 indicates a problem in the Throttle Position Sensor (TPS) Communication Circuit, specifically a performance issue with signal transmission.

2. What are the symptoms of code P16A2 in a 2018 GMC Sierra?

Common symptoms include reduced engine performance, poor throttle response, illuminated check engine light, and possible activation of limp mode.

3. What causes the P16A2 code to appear on a GMC Sierra?

Potential causes include a faulty throttle position sensor, damaged wiring or connectors in the TPS circuit, or a malfunctioning engine control module (ECM).

4. Can I drive with the P16A2 code in my GMC Sierra?

It’s not recommended to drive with this code active, as it may lead to reduced performance or unsafe driving conditions due to throttle issues.

5. How do I diagnose the P16A2 code on a 2018 GMC Sierra?

Diagnosis involves inspecting the TPS and its wiring for damage, using a scan tool to check live data from the sensor, and testing the circuit for proper voltage and ground.

6. Can a dirty throttle body cause the P16A2 code?

While a dirty throttle body can cause other performance issues, it is unlikely to directly cause the P16A2 code, which relates to the TPS communication circuit.

7. How do I fix the P16A2 code on my GMC Sierra?

Repairs may include replacing the throttle position sensor, repairing or replacing damaged wiring or connectors, or addressing ECM-related issues if necessary.

8. How much does it cost to fix the P16A2 code on a 2018 GMC Sierra?

Repair costs can vary but typically range from $150 to $400, depending on whether the TPS, wiring, or ECM requires replacement.

9. Can a software update fix the P16A2 code on my GMC Sierra?

In some cases, an ECM software update from a dealership may resolve communication issues related to this code.

10. Is the P16A2 code covered under warranty for a 2018 GMC Sierra?

This depends on your vehicle's warranty status. Powertrain or emissions-related warranties might cover the repair, so check with your dealer.

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