AutoCodes – GMC – P20C0 2014 GMC Sierra

P20C0 2014 GMC Sierra Code - Reductant Heater 2 Control Circuit High Voltage

Quick Answer

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater 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: P20C0 2014 GMC Sierra indicates Reductant Heater 2 Control Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Heater, Reductant Heater harness is open or shorted, Reductant Heater 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 187

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 29, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P20C0 2014 GMC Sierra Description

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. One heats the reductant in the tank, and one heats the reductant supplied to the reductant injector supply pipe. The Engine Control Module (ECM) monitors the reductant temperature in the tank in order to determine if the reductant temperature is below its freeze point. If the ECM determines that the reductant may be frozen, it activates a "defrost strategy" energizing the reductant eater. This energizing action terminates when the temperature sensor measures a threshold value over which the heater must be deactivated.
The Diagnostic Trouble Code (DTC) will be set when the ECM indicates the reductant line heater control circuit is shorted to a voltage for greater than 4 s.

OBDII Code P20C0 2014 GMC Sierra - Reductant Heater 2 Control Circuit High Voltage - AutoCodes.com — P20C0 2014 GMC Sierra Code - Reductant Heater 2 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P20C0 2014 GMC Sierra?

Faulty Reductant Heater
Reductant Heater harness is open or shorted
Reductant Heater circuit poor electrical connection
Faulty Reductant Pump and Sensor Assembly
Faulty Reductant Control Module

How to Fix the DTC P20C0 2014 GMC Sierra?

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 P20C0 2014 GMC Sierra 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 P20C0 2014 GMC Sierra code?

Need more information on how to fix the P20C0 2014 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P20C0 2014 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 P20C0 2014 GMC Sierra Code

1. What are the common symptoms of OBDII code P20C0 in a 2014 GMC Sierra?

The common symptoms of OBDII code P20C0 in a 2014 GMC Sierra include the check engine light coming on, reduced engine performance, and potentially poor fuel efficiency.

2. What does the OBDII code P20C0 indicate in a 2014 GMC Sierra?

OBDII code P20C0 in a 2014 GMC Sierra indicates a fault with the Reductant Heater 2 Control Circuit, specifically high voltage being detected.

3. What are the possible causes of OBDII code P20C0 in a 2014 GMC Sierra?

Possible causes of OBDII code P20C0 in a 2014 GMC Sierra include a faulty reductant heater, damaged wiring or connectors in the control circuit, or issues with the powertrain control module (PCM).

4. How serious is OBDII code P20C0 in a 2014 GMC Sierra?

OBDII code P20C0 in a 2014 GMC Sierra should be addressed promptly as it can lead to reduced emissions control performance and potentially cause the vehicle to fail emissions testing.

5. Can I continue driving my 2014 GMC Sierra with OBDII code P20C0?

It is not recommended to continue driving your 2014 GMC Sierra with OBDII code P20C0 as it can impact the vehicle's performance and emissions control systems.

6. How can I diagnose and repair OBDII code P20C0 in my 2014 GMC Sierra?

Diagnosing and repairing OBDII code P20C0 in a 2014 GMC Sierra typically involves testing the reductant heater, checking the wiring and connectors for damage, and verifying the operation of the control circuit components.

7. Is it possible to reset OBDII code P20C0 in a 2014 GMC Sierra?

Resetting OBDII code P20C0 in a 2014 GMC Sierra may temporarily turn off the check engine light, but the underlying issue causing the fault needs to be diagnosed and repaired to prevent the code from reoccurring.

8. How much does it cost to fix OBDII code P20C0 in a 2014 GMC Sierra?

The cost to fix OBDII code P20C0 in a 2014 GMC Sierra can vary depending on the specific cause of the issue, but it may involve replacing the reductant heater, repairing damaged wiring, or addressing PCM issues.

9. Can OBDII code P20C0 in a 2014 GMC Sierra cause any other problems?

OBDII code P20C0 in a 2014 GMC Sierra primarily affects the reductant heater control circuit, but if left unresolved, it can impact the vehicle's emissions system and overall engine performance.

10. How often does OBDII code P20C0 occur in a 2014 GMC Sierra?

OBDII code P20C0 in a 2014 GMC Sierra is relatively rare compared to more common fault codes, but it can still occur due to various factors affecting the reductant heater control circuit.