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P10C8 GMC Code - Reductant Temperature Signal Message Counter Incorrect

Quick Answer

The P10C8 diagnostic trouble code (DTC) for GMC vehicles indicates that the reductant temperature signal message counter is incorrect. Common causes include Faulty Reductant Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the vehicle's computer, Wiring Issues: Damaged or corroded wiring connecting the reductant temperature sensor to the vehicle's computer can disrupt the signal transmission, Software Glitch: An issue with the vehicle's onboard computer software may cause the incorrect message counter reading. 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
P10C8 GMC indicates Reductant Temperature Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Reductant Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the vehicle's computer, Wiring Issues: Damaged or corroded wiring connecting the reductant temperature sensor to the vehicle's computer can disrupt the signal transmission, Software Glitch: An issue with the vehicle's onboard computer software may cause the incorrect message counter reading.
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 15, 2024
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Code P10C8 GMC Description

The P10C8 diagnostic trouble code (DTC) for GMC vehicles indicates that the reductant temperature signal message counter is incorrect. In vehicles equipped with a selective catalytic reduction (SCR) system, the reductant temperature sensor plays a crucial role in monitoring the temperature of the diesel exhaust fluid (DEF) as it enters the SCR system. The reductant temperature signal message counter being incorrect suggests that there is a discrepancy in the data being transmitted by the sensor, which can lead to issues with the vehicle's emissions control system.

OBDII Code P10C8 GMC - Reductant Temperature Signal Message Counter Incorrect
P10C8 GMC Code - Reductant Temperature Signal Message Counter Incorrect

Common Causes of P10C8 GMC

  1. Faulty Reductant Temperature Sensor: The sensor itself may be malfunctioning, providing incorrect temperature readings to the vehicle's computer.
  2. Wiring Issues: Damaged or corroded wiring connecting the reductant temperature sensor to the vehicle's computer can disrupt the signal transmission.
  3. Software Glitch: An issue with the vehicle's onboard computer software may cause the incorrect message counter reading.
  4. Exhaust System Leak: A leak in the exhaust system can affect the temperature of the DEF as it enters the SCR system, leading to inaccurate readings.
  5. DEF Contamination: Contaminated or low-quality DEF can also impact the sensor's readings and trigger the P10C8 code.

Symptoms of P10C8 GMC

  1. Check Engine Light: The most common symptom associated with the P10C8 code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning reductant temperature sensor can lead to improper DEF injection, causing the engine to consume more fuel than necessary.
  3. Poor Performance: The vehicle may experience a decrease in performance, such as reduced acceleration or overall power.
  4. Increased Emissions: Due to inaccurate DEF injection, the vehicle may produce higher emissions than allowed by environmental regulations.

How to Fix P10C8 GMC

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and identify the root cause of the problem.
  2. Inspect the Reductant Temperature Sensor: Check the sensor for any visible damage or signs of malfunction and replace if necessary.
  3. Check Wiring Connections: Inspect the wiring harness for any damage or corrosion, repair or replace as needed.
  4. Clear the Code: After making the necessary repairs, clear the DTC from the vehicle's computer memory using the diagnostic scanner.
  5. Test Drive: Take the vehicle for a test drive to ensure that the issue has been resolved and that the check engine light does not reappear.

Cost to Fix P10C8 GMC

The cost of repairing a P10C8 DTC can vary depending on the specific cause of the issue and the labor rates in your area. On average, the cost of replacing a faulty reductant temperature sensor can range from $150 to $300, including parts and labor. However, additional costs may apply if there are wiring issues or other underlying problems that need to be addressed. It's recommended to consult with a qualified mechanic or auto repair shop to get an accurate estimate based on your vehicle's make and model. Keep in mind that diagnostic time and labor rates can vary, so it's advisable to inquire about these factors before proceeding with the repair.

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Information for Specific GMC Models

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 P10C8 GMC Code

1. What are the common symptoms of OBDII code P10C8 GMC?

- The common symptoms include the check engine light illuminating on the dashboard, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What does the OBDII code P10C8 GMC indicate?

- This code indicates that the Reductant Temperature Signal Message Counter is incorrect, which typically relates to issues with the vehicle's selective catalytic reduction (SCR) system.

3. What are possible causes of OBDII code P10C8 GMC?

- Possible causes include faulty reductant temperature sensors, wiring or connector issues, software glitches, or problems with the SCR system components.

4. How can I diagnose the OBDII code P10C8 GMC?

- Diagnosing this code usually involves using a diagnostic scanner to retrieve and interpret the code, checking the reductant temperature sensor readings, inspecting wiring connections, and performing a thorough inspection of the SCR system.

5. Can I continue driving with OBDII code P10C8 GMC present?

- It is not recommended to continue driving with this code present, as it can lead to further damage to the emissions system and potentially fail emissions testing.

6. How do I repair OBDII code P10C8 GMC?

- Repairing this code may involve replacing faulty reductant temperature sensors, repairing wiring or connector issues, updating software if necessary, or addressing any problems with the SCR system components.

7. Are there any DIY tips for fixing OBDII code P10C8 GMC?

- DIY tips may include checking for loose or damaged wiring connections, visually inspecting the reductant temperature sensors for damage, and ensuring proper fluid levels in the SCR system.

8. How much does it cost to repair OBDII code P10C8 GMC at a mechanic?

- The cost of repairing this code can vary depending on the specific issue, but it may range from $100 to $500 or more, considering parts and labor costs.

9. How long does it take to repair OBDII code P10C8 GMC?

- The repair time can vary based on the exact cause of the code and the complexity of the repair needed, but it may take anywhere from a few hours to a full day at a mechanic's shop.

10. Can resetting the OBDII code P10C8 GMC make it go away permanently?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue is not addressed, the code is likely to reappear. It's important to diagnose and repair the root cause of the problem to prevent further issues.

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