AutoCodes – Chevrolet – P1194 2016 Chevrolet Silverado

P1194 2016 Chevrolet Silverado Code - O2 Low Reference Circuit High Voltage (NOx Sensor 1)

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: P1194 2016 Chevrolet Silverado indicates O2 Low Reference Circuit High Voltage (NOx Sensor 1).
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 204

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Mar 24, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1194 2016 Chevrolet Silverado 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 P1194 2016 Chevrolet Silverado - O2 Low Reference Circuit High Voltage (NOx Sensor 1) - AutoCodes.com — P1194 2016 Chevrolet Silverado Code - O2 Low Reference Circuit High Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P1194 2016 Chevrolet Silverado?

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 P1194 2016 Chevrolet Silverado?

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 P1194 2016 Chevrolet Silverado 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 P1194 2016 Chevrolet Silverado code?

Need more information on how to fix the P1194 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals

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 P1194 2016 Chevrolet Silverado Code

1. What does the OBDII code P1194 mean on a 2016 Chevrolet Silverado?

Code P1194 indicates an issue with the O2 low reference circuit showing high voltage, specifically related to NOx Sensor 1.

2. What are the common symptoms of code P1194 in a 2016 Chevrolet Silverado?

Symptoms may include the Check Engine Light turning on, reduced fuel efficiency, poor engine performance, and increased emissions.

3. What causes the P1194 code to appear on a 2016 Chevrolet Silverado?

Possible causes include a faulty NOx Sensor 1, damaged wiring or connectors in the O2 low reference circuit, or a malfunctioning Engine Control Module (ECM).

4. How do I diagnose the P1194 code on my 2016 Chevrolet Silverado?

Start by inspecting the wiring and connectors for damage or corrosion, test the NOx Sensor 1 for proper operation, and check for ECM-related issues.

5. Can a dirty or failing NOx sensor trigger code P1194?

Yes, a dirty or failing NOx sensor can cause incorrect voltage readings, leading to the P1194 code.

6. Is it safe to drive a 2016 Chevrolet Silverado with a P1194 code?

While the vehicle may still be drivable, ignoring the code can result in reduced performance, higher emissions, and potential damage to other components over time.

7. How do you fix the P1194 code on a 2016 Chevrolet Silverado?

Repairs may include replacing the NOx Sensor 1, repairing or replacing damaged wiring or connectors, or reprogramming/updating the ECM.

8. What tools are needed to diagnose and repair the P1194 code?

Youâ€™ll need an OBDII scanner, a multimeter to test voltage and continuity, and potentially a NOx sensor tester or replacement part.

9. How much does it cost to fix the P1194 code on a 2016 Chevrolet Silverado?

The repair cost depends on the issue. Replacing a NOx sensor typically costs $200â€“$600, while wiring repairs or ECM reprogramming may vary.

10. Can a software update resolve the P1194 code on a 2016 Chevrolet Silverado?

In some cases, a software update or reprogramming the ECM may resolve the issue if itâ€™s caused by incorrect sensor calibration or software glitches.