AutoCodes – Buick – P2206 Buick

P2206 Buick Code - NOx Sensor 1 Heater Control Circuit Low 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: P2206 Buick indicates NOx Sensor 1 Heater Control Circuit Low 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.

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Code Popularity 322

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2206 Buick 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 P2206 Buick - NOx Sensor 1 Heater Control Circuit Low Voltage - AutoCodes.com — P2206 Buick Code - NOx Sensor 1 Heater Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2206 Buick?

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 P2206 Buick?

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 P2206 Buick 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.

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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 P2206 Buick Code

1. What are common symptoms of OBDII code P2206 in a Buick related to the NOx Sensor 1 Heater Control Circuit Low Voltage?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and potential illumination of the check engine light.

2. What are some possible causes of OBDII code P2206 in a Buick?

- Possible causes of this code include a faulty NOx sensor, damaged wiring or connectors, a defective heater control circuit, or issues with the engine control module (ECM).

3. How can I diagnose the cause of OBDII code P2206 in my Buick?

- To diagnose this code, you can use an OBDII scanner to read and interpret the code, visually inspect the NOx sensor and its connections for any damage, and test the sensor's heater circuit for proper voltage.

4. Are there any DIY repair tips for addressing OBDII code P2206 in a Buick?

- DIY repair tips include checking and repairing any damaged wiring or connectors associated with the NOx sensor, replacing the sensor if it is faulty, and ensuring the heater control circuit is functioning correctly.

5. Can driving with OBDII code P2206 in a Buick cause further damage to the vehicle?

- Continuing to drive with this code may lead to increased emissions, reduced fuel efficiency, and potential damage to other components of the emissions control system in the vehicle.

6. How much does it typically cost to repair OBDII code P2206 in a Buick at a professional auto repair shop?

- Repair costs for this code can vary depending on the exact cause of the issue, but typically range from $200 to $500, including parts and labor.

7. Is it safe to drive my Buick with OBDII code P2206 present?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to prevent potential damage to the emissions system and ensure optimal engine performance.

8. How long does it usually take to repair OBDII code P2206 in a Buick?

- The repair time for this code can vary depending on the specific cause and the complexity of the repair, but it typically takes between 1 to 2 hours to diagnose and fix the issue.

9. Can resetting the OBDII code P2206 in a Buick turn off the check engine light temporarily?

- Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, the light is likely to come back on after a short period of driving.

10. Will OBDII code P2206 in a Buick affect the vehicle's emissions and cause it to fail an emissions test?

- Yes, this code indicates a problem with the NOx sensor's heater control circuit, which can impact the vehicle's emissions output and potentially cause it to fail an emissions test.