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P116E Cadillac Code - O2 Pump Current Control 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: P116E Cadillac indicates O2 Pump Current Control 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 390

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 P116E 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 P116E Cadillac - O2 Pump Current Control Circuit Low Voltage (NOx Sensor 1) - AutoCodes.com — P116E Cadillac Code - O2 Pump Current Control Circuit Low Voltage (NOx Sensor 1)

What does this mean?

What are the Possible Causes of the DTC P116E 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 P116E 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 P116E 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 P116E Cadillac Code

1. What does the OBDII code P116E mean on a Cadillac?

The P116E code indicates a low voltage issue in the O2 Pump Current Control Circuit for NOx Sensor 1, which monitors nitrogen oxide levels in the exhaust.

2. What are the common symptoms of a P116E code?

Common symptoms include a check engine light, decreased fuel efficiency, rough idling, and potential performance issues.

3. What causes the P116E code to appear?

Possible causes include a faulty NOx sensor, damaged wiring or connectors in the circuit, or a malfunctioning engine control module (ECM).

4. Can I still drive my Cadillac with a P116E code?

While the car may still be operational, driving with this code can lead to reduced performance, increased emissions, and potential damage to the catalytic converter.

5. How do I diagnose a P116E code on my Cadillac?

Diagnosing this code typically involves scanning with an OBDII tool, inspecting the NOx sensor and its wiring, and testing the circuit voltage and resistance.

6. How do I fix the P116E code on a Cadillac?

Repairs may include replacing the NOx sensor, repairing damaged wiring or connectors, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to repair a P116E code?

The repair cost varies, but replacing a NOx sensor typically ranges from $300 to $700, depending on the part and labor costs.

8. Can a faulty NOx sensor cause other problems?

Yes, a malfunctioning NOx sensor can affect engine performance, increase emissions, and potentially damage the catalytic converter over time.

9. How can I prevent the P116E code from recurring?

Regular maintenance, timely replacement of sensors, and ensuring the wiring and connectors are in good condition can help prevent this code from recurring.

10. Is the P116E code unique to Cadillacs?

No, while this code may appear on other vehicles, its specific implications and repair procedures can vary by make and model. Always refer to your Cadillacâ€™s service manual for accurate guidance.