AutoCodes – Generic – P2207

P2207 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 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.

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Code Popularity 16,085

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 P2207 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 - NOx Sensor 1 Heater Control Circuit High Voltage - AutoCodes.com — P2207 Code - NOx Sensor 1 Heater Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2207?

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?

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 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 code?

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

Need Help with the Code?

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Information for Specific Makes

P2207 Buick — NOx Sensor 1 Heater Control Circuit High Voltage
P2207 Cadillac — NOx Sensor 1 Heater Control Circuit High Voltage
P2207 Chevrolet — NOx Sensor 1 Heater Control Circuit High Voltage
P2207 Dodge — NOx Sensor Heater Control Circuit High Bank 1
P2207 Ford — NOx Sensor Heater Control Circuit High Bank 1
P2207 GMC — NOx Sensor 1 Heater Control Circuit High Voltage

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 Code

1. What are the common symptoms of OBDII code P2207 (NOx Sensor 1 Heater Control Circuit High Voltage)?

- Common symptoms include the check engine light illuminating, poor engine performance, increased fuel consumption, and potential emission test failures.

2. What are the possible causes of OBDII code P2207?

- Possible causes may include a faulty NOx sensor, damaged wiring or connectors in the heater circuit, a malfunctioning powertrain control module (PCM), or a blown fuse.

3. How do I diagnose the NOx sensor heater circuit to address code P2207?

- Diagnose the NOx sensor heater circuit by checking the sensor's resistance, testing for power and ground at the sensor connector, and inspecting the wiring for damage or corrosion.

4. Can a bad NOx sensor cause code P2207?

- Yes, a faulty NOx sensor can trigger code P2207 as it may not be able to control the heater circuit properly, leading to high voltage readings.

5. What are some repair tips for resolving OBDII code P2207?

- Repair tips include checking and repairing any damaged wiring or connectors, replacing the NOx sensor if faulty, ensuring proper power and ground connections, and clearing the code to see if it returns.

6. Is it safe to continue driving with OBDII code P2207 present?

- It is generally not recommended to continue driving with code P2207 present, as it can lead to increased emissions, reduced fuel efficiency, and potential damage to other components if left unresolved.

7. How serious is OBDII code P2207 (NOx Sensor 1 Heater Control Circuit High Voltage)?

- While code P2207 may not cause immediate drivability issues, it is important to address it promptly to prevent potential damage to the emissions control system and ensure proper vehicle performance.

8. Can a blown fuse cause OBDII code P2207 to appear?

- Yes, a blown fuse in the NOx sensor heater circuit can cause high voltage readings and trigger code P2207. Checking and replacing the fuse may resolve the issue.

9. What role does the NOx sensor play in the vehicle's emissions control system?

- The NOx sensor measures the level of nitrogen oxide in the exhaust gases and helps the vehicle's emissions control system optimize fuel mixture and reduce harmful emissions.

10. How can I prevent OBDII code P2207 from reoccurring in the future?

- To prevent code P2207 from reoccurring, perform regular maintenance on the emissions system, address any underlying issues promptly, and follow the manufacturer's recommended service schedule.