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P116F Cadillac Code - O2 Pump Current Control 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: P116F Cadillac indicates O2 Pump Current Control 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 424

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 P116F 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 P116F Cadillac - O2 Pump Current Control Circuit High Voltage (NOx Sensor 1) - AutoCodes.com — P116F Cadillac Code - O2 Pump Current Control Circuit High Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116F 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 P116F 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 P116F 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 P116F Cadillac Code

1. What are the common symptoms of OBDII code P116F in a Cadillac?

- Common symptoms include reduced engine performance, increased fuel consumption, rough idling, and the illumination of the check engine light.

2. What could cause the O2 Pump Current Control Circuit High Voltage error code in a Cadillac?

- Possible causes include a faulty NOx sensor, damaged wiring or connectors in the O2 pump circuit, or issues with the engine control module (ECM).

3. How can I diagnose the O2 Pump Current Control Circuit High Voltage issue in my Cadillac?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code P116F, inspecting the NOx sensor and its connections, and checking for any visible signs of damage.

4. Can I continue driving my Cadillac with the P116F error code?

- It is not recommended to drive your Cadillac with the P116F code as it can lead to further engine damage and potential safety risks. It's best to address the issue promptly.

5. What are the repair options for fixing the O2 Pump Current Control Circuit High Voltage fault in a Cadillac?

- Repair options may include replacing the NOx sensor, repairing or replacing damaged wiring or connectors, or reprogramming the ECM to address any control circuit issues.

6. Is it possible to reset the check engine light after addressing the P116F code in a Cadillac?

- Yes, once the underlying issue causing the fault code has been resolved, the check engine light can be reset using an OBDII scanner or by disconnecting the car's battery for a few minutes.

7. How critical is it to address the P116F OBDII code in a Cadillac promptly?

- It is important to address the P116F code promptly to prevent potential damage to other engine components and ensure optimal performance and fuel efficiency of your Cadillac.

8. Are there any preventive maintenance measures to avoid encountering the O2 Pump Current Control Circuit High Voltage error in a Cadillac?

- Regularly inspecting and maintaining the NOx sensor, as well as keeping an eye on the overall health of the engine and emissions system, can help prevent issues leading to the P116F fault code.

9. Can a DIY enthusiast fix the O2 Pump Current Control Circuit High Voltage fault in a Cadillac?

- Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address the P116F code by following repair guides and utilizing proper diagnostic equipment.

10. How long does it typically take to repair the O2 Pump Current Control Circuit High Voltage fault in a Cadillac?

- The repair time can vary depending on the exact cause of the issue and the complexity of the repair needed. It is advisable to consult a professional mechanic for a more accurate estimate.