AutoCodes – GMC – P2207 2018 GMC Sierra

P2207 2018 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit High Voltage

Quick Answer

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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: P2207 2018 GMC Sierra indicates NOx Sensor 1 Heater Control Circuit High Voltage.
Common causes: Common causes include Faulty Nitrogen Oxides (NOx) Sensor, Nitrogen Oxides Sensor harness is open or shorted, Nitrogen Oxides 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.

Save to My Repairs My Repairs

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

Code Popularity 160

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 Mar 24, 2024

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 P2207 2018 GMC Sierra Description

The Nitrogen Oxides (NOx) sensors are part of the selective catalytic reduction system, a device used to reduce NOx emission on diesel engines. There are two NOx sensors, one placed upstream of selective catalytic reduction, to measure inlet NOx concentration, and one placed downstream. They are connected with the control module via CAN and all the information is exchanged through it. Since it is a smart sensor, all the electrical monitoring is performed inside the sensor and only the results are sent to the Engine Control Module (ECM). Each NOx sensor contains a sensing cell, a pumping cell, and a heater. A sample of exhaust gas passes through a diffusion gap between the sensing cell and the pumping cell. The NOx sensor maintains a constant reference voltage across the sensing cell. An electronic circuit within the sensor controls the pump current through the pumping cell in order to maintain a constant voltage in the sensing cell. The amount of current required to maintain the reference voltage in the sensing cell is proportional to the concentration of NOx in the exhaust. The ECM varies the amount of diesel exhaust fluid (reductant) added by varying the reductant injector duty cycle in response to changes in engine exhaust NOx levels. The smart NOx sensors consist of two components, the NOx module and the NOx sensor element that are serviced as a unit. A circuit or performance condition with a NOx sensor is detected by the NOx sensor module. The smart NOx sensor module communicates the condition to the ECM over the serial data line. The ECM sets a DTC when a serial data message is received from the NOx sensor module. The Diagnostic Trouble Code (DTC) will be set if the ECM software detects a fault in the NOx sensor circuitry or a performance fault in the NOx sensor for greater than 2 s.

OBDII Code P2207 2018 GMC Sierra - NOx Sensor 1 Heater Control Circuit High Voltage - AutoCodes.com — P2207 2018 GMC Sierra Code - NOx Sensor 1 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2207 2018 GMC Sierra?

Faulty Nitrogen Oxides (NOx) Sensor
Nitrogen Oxides Sensor harness is open or shorted
Nitrogen Oxides Sensor circuit poor electrical connection

How to Fix the DTC P2207 2018 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 P2207 2018 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 P2207 2018 GMC Sierra code?

Need more information on how to fix the P2207 2018 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2207 2018 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 P2207 2018 GMC Sierra Code

What does the OBDII code P2207 mean for a 2018 GMC Sierra?

P2207 indicates an issue with the NOx Sensor 1 Heater Control Circuit, specifically a high voltage condition.

What are common symptoms of code P2207 in a 2018 GMC Sierra?

Symptoms may include a check engine light, reduced fuel efficiency, poor engine performance, and possible failure to meet emissions standards.

What causes the P2207 code to appear in a 2018 GMC Sierra?

Common causes include a malfunctioning NOx sensor heater, wiring issues such as frayed or damaged wires, or a fault in the engine control module (ECM).

Can a faulty NOx sensor heater affect engine performance in a 2018 GMC Sierra?

Yes, a faulty NOx sensor heater can result in incorrect emissions readings, leading to reduced engine efficiency and performance.

How can I diagnose the P2207 code on my 2018 GMC Sierra?

You can diagnose it by using an OBDII scanner to confirm the code, visually inspecting the wiring and connectors for damage, and testing the NOx sensor heater circuit with a multimeter.

Is it safe to drive a 2018 GMC Sierra with the P2207 code?

While it may be safe to drive short-term, ignoring this code can lead to increased emissions, reduced fuel efficiency, and potential damage to other components.

How do I fix the P2207 code on a 2018 GMC Sierra?

Repairs may involve replacing the NOx sensor, repairing damaged wiring or connectors, or addressing ECM issues if the fault lies in the control module.

How much does it cost to fix the P2207 code on a 2018 GMC Sierra?

Repair costs vary but typically range from $300 to $600 for parts and labor, depending on whether the NOx sensor or wiring needs replacement.

Can a software update fix the P2207 code in a 2018 GMC Sierra?

In rare cases, a software update to the ECM may resolve the issue, but this is only effective if the problem stems from a programming error.

How can I prevent the P2207 code from appearing again on my 2018 GMC Sierra?

Regular maintenance, such as inspecting wiring and connectors and ensuring proper functioning of emission control components, can help prevent this code.