AutoCodes – GMC – P206C GMC

P206C GMC Code - Reductant Quality Sensor Circuit Low Voltage

Quick Answer

The Reductant Quality Sensor is located in the reductant tank and uses an ultrasonic signal to measure reductant fluid quality. Common causes include Faulty Reductant Quality Sensor, Reductant Quality Sensor harness is open or shorted, Reductant Quality Sensor circuit poor electrical connection. 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
P206C GMC indicates Reductant Quality Sensor Circuit Low Voltage.
Common causes
Common causes include Faulty Reductant Quality Sensor, Reductant Quality Sensor harness is open or shorted, Reductant Quality Sensor circuit poor electrical connection.
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.
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Code Popularity 502
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jul 26, 2021
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Code P206C GMC Description

The Reductant Quality Sensor is located in the reductant tank and uses an ultrasonic signal to measure reductant fluid quality. The reductant quality sensor includes an integrated temperature sensor to measure reductant fluid temperature. The Reductant Quality Sensor communicates with the Reductant Control Module using serial data. The Diagnostic Trouble Code (DTC) will be set Reductant Control Module detects that the Reductant Quality Sensor signal is out of range low for greater than 5 s.
OBDII Code P206C GMC - Reductant Quality Sensor Circuit Low Voltage - AutoCodes.com
P206C GMC Code - Reductant Quality Sensor Circuit Low Voltage

What are the Possible Causes of the DTC P206C GMC?

  • Faulty Reductant Quality Sensor
  • Reductant Quality Sensor harness is open or shorted
  • Reductant Quality Sensor circuit poor electrical connection

How to Fix the DTC P206C GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P206C GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P206C GMC code?

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Need Help with the Code?

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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 P206C GMC Code

1. What are the common symptoms of OBDII code P206C GMC (Reductant Quality Sensor Circuit Low Voltage)?

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

2. What can cause the OBDII code P206C GMC to trigger?

This code is typically triggered by a malfunction in the reductant quality sensor circuit, which measures the quality of the diesel exhaust fluid (DEF) in the vehicle.

3. How can I diagnose the cause of OBDII code P206C GMC?

Diagnosing the issue involves conducting a thorough inspection of the reductant quality sensor and its wiring for any damage or loose connections. It may also require testing the sensor's voltage output.

4. What are the potential repair options for OBDII code P206C GMC?

Repair options may include replacing the reductant quality sensor, repairing any damaged wiring or connections, or resetting the fault code after fixing the underlying issue.

5. Can I continue driving my vehicle with OBDII code P206C GMC?

It is not recommended to continue driving your vehicle with this code present, as it can lead to further damage to the emissions system and potentially affect the vehicle's performance.

6. How important is it to address OBDII code P206C GMC promptly?

Addressing this code promptly is crucial to ensure that the vehicle's emissions system functions properly and to prevent any potential long-term damage or issues with engine performance.

7. Are there any DIY repair tips for OBDII code P206C GMC?

While some basic inspections and checks can be done by DIY enthusiasts, it is recommended to have a professional mechanic diagnose and repair this code due to the complexity of the emissions system.

8. Will OBDII code P206C GMC cause my vehicle to fail an emissions test?

Yes, having this code present can cause your vehicle to fail an emissions test, as it indicates a malfunction in the emissions control system.

9. How much does it typically cost to repair OBDII code P206C GMC?

The cost of repairing this code can vary depending on the extent of the issue, the type of repair needed, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

10. Can resetting the fault code make OBDII code P206C GMC go away permanently?

Resetting the fault code without addressing the underlying issue will not make the problem go away permanently. It is important to diagnose and repair the root cause of the code to prevent it from reoccurring.

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