AutoCodes – Cadillac – P116B Cadillac

P116B Cadillac Code - O2 Signal Circuit Low 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: P116B Cadillac indicates O2 Signal Circuit Low 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 465

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 29, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P116B Cadillac 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 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 P116B Cadillac - O2 Signal Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P116B Cadillac Code - O2 Signal Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116B Cadillac?

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 P116B Cadillac?

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 P116B Cadillac 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 P116B Cadillac Code

1. What are the common symptoms of OBDII code P116B in a Cadillac related to the O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- Common symptoms may include poor engine performance, decreased fuel efficiency, rough idling, and the illumination of the check engine light.

2. What are the possible causes of the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B in a Cadillac?

- Possible causes may include a faulty NOx sensor, damaged wiring or connectors in the O2 sensor circuit, exhaust leaks, or issues with the engine control module.

3. How can I diagnose the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B in my Cadillac?

- Diagnosing this code typically involves using an OBDII scanner to retrieve the specific error code, checking the wiring and connectors for any visible damage, and testing the NOx sensor's functionality.

4. Can a bad NOx sensor cause the O2 Signal Circuit Low Voltage code P116B in a Cadillac?

- Yes, a malfunctioning NOx sensor can trigger the P116B code due to inaccurate readings or low voltage signals being sent to the engine control module.

5. What are some repair tips for addressing the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B in a Cadillac?

- Repair tips may include replacing the faulty NOx sensor, repairing any damaged wiring or connectors, fixing exhaust leaks, and clearing the error code to see if the issue persists.

6. Is it safe to continue driving my Cadillac with the OBDII code P116B related to the O2 Signal Circuit Low Voltage (NOx Sensor 1)?

- While the vehicle may still be operable, it is recommended to address the underlying issue causing the code to prevent potential damage to the engine or emissions system.

7. How much does it typically cost to repair the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B in a Cadillac?

- Repair costs can vary depending on the exact cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can I reset the check engine light after fixing the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B in my Cadillac?

- Yes, the check engine light can be reset using an OBDII scanner or by disconnecting the vehicle's battery for a few minutes to clear the error code.

9. Will the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B cause my Cadillac to fail an emissions test?

- Yes, if this code is present during an emissions test, it is likely to cause the vehicle to fail, as it indicates a problem with the NOx sensor and emissions control system.

10. How often does the O2 Signal Circuit Low Voltage (NOx Sensor 1) code P116B occur in Cadillac vehicles?

- The occurrence of this specific code can vary, but it is not uncommon in Cadillac vehicles with advanced emissions control systems that include NOx sensors for monitoring exhaust gases.