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P10C7 2018 GMC Sierra Code - Reductant Control System Signal Message Counter Incorrect

Quick Answer

The P10C7 diagnostic trouble code (DTC) specifically refers to a fault in the Reductant Control System Signal Message Counter on a 2018 GMC Sierra. Common causes include Faulty Reductant Control Module, Wiring or connection issues in the Reductant Control System, Malfunctioning exhaust gas temperature sensor. 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
P10C7 2018 GMC Sierra indicates Reductant Control System Signal Message Counter Incorrect.
Common causes
Common causes include Faulty Reductant Control Module, Wiring or connection issues in the Reductant Control System, Malfunctioning exhaust gas temperature sensor.
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 11, 2024
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Code P10C7 2018 GMC Sierra Description

The P10C7 diagnostic trouble code (DTC) specifically refers to a fault in the Reductant Control System Signal Message Counter on a 2018 GMC Sierra. The Reductant Control System is an integral part of the vehicle's emissions control system, responsible for managing the injection of Diesel Exhaust Fluid (DEF) into the exhaust stream to reduce harmful emissions. The Signal Message Counter is a component that keeps track of communication between various modules within the system. When the counter's values are deemed incorrect by the vehicle's onboard computer, it triggers the P10C7 code.

OBDII Code P10C7 2018 GMC Sierra - Reductant Control System Signal Message Counter Incorrect
P10C7 2018 GMC Sierra Code - Reductant Control System Signal Message Counter Incorrect

Common Causes of P10C7 2018 GMC Sierra

  1. Faulty Reductant Control Module
  2. Wiring or connection issues in the Reductant Control System
  3. Malfunctioning exhaust gas temperature sensor
  4. Software or programming issues in the vehicle's onboard computer
  5. Contaminated or poor-quality Diesel Exhaust Fluid

Symptoms of P10C7 2018 GMC Sierra

  1. Check engine light illuminated
  2. Reduced fuel efficiency
  3. Failed emissions test
  4. Engine misfires or hesitation
  5. Increased exhaust emissions

How to Fix P10C7 2018 GMC Sierra

  1. Diagnose the specific cause of the P10C7 code using a diagnostic scanner and troubleshooting the Reductant Control System components.
  2. Inspect the wiring and connections related to the Reductant Control System for any damage or corrosion, repairing or replacing as necessary.
  3. Test the exhaust gas temperature sensor for proper operation and replace if faulty.
  4. Update the vehicle's software or reprogram the Reductant Control System module to address any programming issues.
  5. Flush the system and refill with fresh, high-quality Diesel Exhaust Fluid.

Cost to Fix P10C7 2018 GMC Sierra

The cost of repairing the P10C7 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue and the labor rates at the auto repair shop. Generally, the repair costs for this type of issue can range from $200 to $800, including parts and labor. It is advisable to contact local auto repair shops to get a more accurate estimate based on your location and vehicle specifics. Additionally, keep in mind that diagnostic time and labor rates can vary, with rates typically ranging from $80 to $150 per hour.

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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 P10C7 2018 GMC Sierra Code

1. What does the OBDII code P10C7 mean on a 2018 GMC Sierra?

P10C7 indicates an issue with the Reductant Control System, specifically that the signal message counter is incorrect, which may disrupt proper communication between the reductant control module and other systems.

2. What are common symptoms of code P10C7 on a GMC Sierra?

Symptoms may include the check engine light turning on, reduced engine power, or issues with the diesel exhaust fluid (DEF) system.

3. What causes the P10C7 code to appear on a 2018 GMC Sierra?

Common causes include faulty wiring or connectors in the reductant control system, a malfunctioning reductant control module, or communication errors between modules.

4. Can driving with code P10C7 damage my GMC Sierra?

While driving may not immediately damage the vehicle, prolonged operation with this code can lead to DEF system malfunction, increased emissions, and possible engine performance issues.

5. How can I diagnose the P10C7 code on my GMC Sierra?

Diagnose by using an OBDII scanner to confirm the code, then inspect wiring and connectors for damage, and test the reductant control module for proper operation.

6. How do I fix the P10C7 code on a 2018 GMC Sierra?

Repairs may include replacing damaged wiring or connectors, updating or reprogramming the reductant control module, or replacing the module if it's defective.

7. Does the P10C7 code require professional repair?

While some fixes like checking wiring can be done by a skilled DIYer, module replacement or reprogramming often require specialized tools and knowledge, so professional repair is recommended.

8. Is the reductant control module the main cause of the P10C7 code?

Not always; wiring issues or communication faults between modules can also cause this code. Testing the module is essential to confirm the root cause.

9. Will clearing the P10C7 code solve the problem?

Clearing the code may temporarily turn off the check engine light, but if the underlying issue isn’t addressed, the code will likely return.

10. How much does it cost to repair the P10C7 code on a GMC Sierra?

Repair costs vary depending on the cause, ranging from $100 for minor wiring repairs to $500 or more for module replacement and reprogramming.

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