AutoCodes – GMC – P2627 GMC

P2627 GMC 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 GMC 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 626

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

What does this mean?

What are the Possible Causes of the DTC P2627 GMC?

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 GMC?

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 GMC 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 P2627 GMC code?

Need more information on how to fix the P2627 GMC code? Get Access to Factory Service Manuals

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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 GMC Code

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

The common symptoms of OBDII code P2627 include poor engine performance, reduced fuel efficiency, and an illuminated Check Engine Light.

2. What does the HO2S Pump Current Trim Circuit Low Voltage Sensor 1 error code P2627 mean in a GMC vehicle?

The P2627 code indicates that there is a low voltage condition detected in the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit for Sensor 1 in a GMC vehicle.

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

Possible causes of code P2627 include a faulty oxygen sensor, damaged wiring or connectors, a malfunctioning HO2S pump, or issues with the engine control module (ECM).

4. How serious is the OBDII code P2627 in a GMC vehicle?

While the P2627 code may not cause immediate drivability issues, it can lead to poor engine performance and reduced fuel efficiency over time. It is recommended to address the issue promptly to prevent further damage.

5. How can I diagnose and repair OBDII code P2627 in my GMC vehicle?

Diagnosing and repairing code P2627 typically involves inspecting the oxygen sensor and related components, testing wiring and connectors for faults, and checking the ECM for proper operation. It is recommended to consult a professional mechanic for accurate diagnosis and repair.

6. Can I drive my GMC vehicle with the OBDII code P2627 present?

It is generally safe to drive your GMC vehicle with the P2627 code, but it is advisable to address the issue as soon as possible to prevent potential long-term damage and ensure optimal engine performance.

7. Will resetting the Check Engine Light resolve the OBDII code P2627 in my GMC vehicle?

Simply resetting the Check Engine Light may temporarily clear the code, but it will not fix the underlying issue causing code P2627. It is essential to diagnose and repair the root cause of the problem.

8. How much does it typically cost to repair OBDII code P2627 in a GMC vehicle?

The cost of repairing code P2627 can vary depending on the specific cause of the issue, labor rates in your area, and the parts needed for the repair. It is recommended to obtain quotes from local mechanics or dealerships for an accurate estimate.

9. Can a DIY enthusiast fix OBDII code P2627 in a GMC vehicle?

While some experienced DIY enthusiasts may be able to diagnose and repair code P2627, it is a complex issue that often requires specialized tools and knowledge. For optimal results and to avoid further damage, it is recommended to seek professional help.

10. How often does the OBDII code P2627 occur in GMC vehicles?

The occurrence of OBDII code P2627 in GMC vehicles can vary, but it is not considered a common code. If you encounter this code, it is essential to address it promptly to prevent potential complications.