AutoCodes – Chevrolet – P2627 Chevrolet

P2627 Chevrolet Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 1

Quick Answer

The oxygen content of the exhaust is measured via the Nitrogen Oxide (NOx) sensors. Common causes include Faulty Nitrogen Oxides Sensor 1, Nitrogen Oxides Sensor 1 harness is open or shorted, Nitrogen Oxides Sensor 1 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: P2627 Chevrolet indicates HO2S Pump Current Trim Circuit Low Voltage Sensor 1.
Common causes: Common causes include Faulty Nitrogen Oxides Sensor 1, Nitrogen Oxides Sensor 1 harness is open or shorted, Nitrogen Oxides Sensor 1 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 962

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 Aug 01, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2627 Chevrolet Description

The oxygen content of the exhaust is measured via the Nitrogen Oxide (NOx) sensors. The 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 Diagnostic Trouble Code (DTC) when a serial data message is received from the NOx sensor module.

OBDII Code P2627 Chevrolet - HO2S Pump Current Trim Circuit Low Voltage Sensor 1 - AutoCodes.com — P2627 Chevrolet Code - HO2S Pump Current Trim Circuit Low Voltage Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2627 Chevrolet?

Faulty Nitrogen Oxides Sensor 1
Nitrogen Oxides Sensor 1 harness is open or shorted
Nitrogen Oxides Sensor 1 circuit poor electrical connection

How to Fix the DTC P2627 Chevrolet?

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 P2627 Chevrolet 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 P2627 Chevrolet Code

1. What are the common symptoms of OBDII code P2627 in a Chevrolet vehicle?

The common symptoms of OBDII code P2627 in a Chevrolet vehicle may include poor engine performance, decreased fuel efficiency, rough idling, and the illumination of the Check Engine Light.

2. What does the OBDII code P2627 Chevrolet indicate?

OBDII code P2627 in a Chevrolet indicates a problem with the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit for Sensor 1, specifically a low voltage condition.

3. What are the possible causes of OBDII code P2627 in a Chevrolet?

Possible causes of OBDII code P2627 in a Chevrolet include a faulty HO2S sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning HO2S heater, or issues with the engine control module (ECM).

4. How serious is OBDII code P2627 in a Chevrolet?

OBDII code P2627 in a Chevrolet should be addressed promptly to prevent potential damage to the catalytic converter and ensure optimal engine performance and fuel efficiency.

5. How can I diagnose OBDII code P2627 in my Chevrolet?

Diagnosing OBDII code P2627 in a Chevrolet typically involves using an OBDII scanner to retrieve the code, inspecting the HO2S sensor and its wiring for any visible damage, and testing the sensor's voltage with a multimeter.

6. Can I drive my Chevrolet with OBDII code P2627?

It is not recommended to drive your Chevrolet with OBDII code P2627, as it can lead to poor engine performance, decreased fuel efficiency, and potential damage to the catalytic converter.

7. How can I repair OBDII code P2627 in my Chevrolet?

Repairing OBDII code P2627 in a Chevrolet may involve replacing the faulty HO2S sensor, repairing or replacing damaged wiring or connectors, fixing any issues with the HO2S heater, or reprogramming the engine control module (ECM).

8. Is it possible to reset OBDII code P2627 in a Chevrolet without fixing the underlying issue?

While you can clear the code using an OBDII scanner, it is not recommended to reset OBDII code P2627 in a Chevrolet without addressing the underlying issue, as it may lead to recurring problems and potential damage.

9. How much does it cost to fix OBDII code P2627 in a Chevrolet?

The cost to fix OBDII code P2627 in a Chevrolet can vary depending on the specific cause of the issue, the parts needed for repair, labor costs, and whether you choose to do the repair yourself or take it to a professional mechanic.

10. Can a DIY enthusiast repair OBDII code P2627 in a Chevrolet?

A DIY enthusiast with automotive repair experience and the necessary tools can potentially repair OBDII code P2627 in a Chevrolet by following diagnostic procedures, replacing components as needed, and ensuring proper reassembly.