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Engine-Codes – GMC – P2628 GMC

P2628 GMC Code - HO2S Pump Current Trim Circuit High Voltage Sensor 1

Quick Answer

The P2628 diagnostic trouble code (DTC) for GMC vehicles pertains to the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit High Voltage Sensor 1. Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the current trim circuit, Malfunctioning ECM. 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
P2628 GMC indicates HO2S Pump Current Trim Circuit High Voltage Sensor 1.
Common causes
Common causes include Faulty oxygen sensor, Damaged wiring or connectors in the current trim circuit, Malfunctioning ECM.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 09, 2024
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Code P2628 GMC Description

The P2628 diagnostic trouble code (DTC) for GMC vehicles pertains to the HO2S (Heated Oxygen Sensor) Pump Current Trim Circuit High Voltage Sensor 1. This code indicates that there is a high voltage condition detected in the circuit that controls the current trim for the oxygen sensor. The oxygen sensor plays a crucial role in monitoring the oxygen levels in the exhaust gases, which helps the engine management system adjust the air-fuel mixture for optimal combustion efficiency. The current trim circuit ensures that the oxygen sensor operates within specified parameters to provide accurate feedback to the engine control module (ECM).

OBDII Code P2628 GMC - HO2S Pump Current Trim Circuit High Voltage Sensor 1
P2628 GMC Code - HO2S Pump Current Trim Circuit High Voltage Sensor 1

Common Causes of P2628 GMC

  1. Faulty oxygen sensor
  2. Damaged wiring or connectors in the current trim circuit
  3. Malfunctioning ECM
  4. Fuel system issues such as a clogged fuel filter or fuel pump failure
  5. Exhaust leaks affecting oxygen sensor readings

Symptoms of P2628 GMC

  1. Decreased fuel efficiency
  2. Engine misfires
  3. Rough idling or stalling
  4. Illuminated check engine light
  5. Failed emissions test

How to Fix P2628 GMC

  1. Use an OBD-II scanner to retrieve the specific trouble code and verify the high voltage condition in the HO2S pump current trim circuit.
  2. Inspect the oxygen sensor and related wiring for any visible damage or corrosion.
  3. Test the oxygen sensor's heater circuit and current trim circuit using a multimeter to check for proper voltage levels.
  4. Replace the oxygen sensor if it is determined to be faulty, and repair or replace any damaged wiring or connectors.
  5. Clear the DTC from the ECM's memory and perform a test drive to ensure the issue has been resolved.

Cost to Fix P2628 GMC

The typical repair costs for addressing a P2628 code on a GMC vehicle can range from $200 to $500, including parts and labor. It is important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge hourly rates between $80 and $150, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. For a more precise estimate, it is recommended to inquire about local rates before proceeding with the repair.

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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 P2628 GMC Code

1. What are the common symptoms of OBDII code P2628 in a GMC vehicle?

The common symptoms of OBDII code P2628 in a GMC vehicle may include poor fuel economy, rough idling, engine hesitation, and the illumination of the Check Engine Light.

2. What does the OBDII code P2628 for HO2S Pump Current Trim Circuit High Voltage Sensor 1 mean in a GMC?

The OBDII code P2628 indicates a high voltage condition in the oxygen sensor pump current trim circuit for Sensor 1 in a GMC vehicle.

3. What are the possible causes of OBDII code P2628 in a GMC?

Possible causes of OBDII code P2628 in a GMC include a faulty oxygen sensor, damaged wiring or connectors in the circuit, a defective oxygen sensor pump, or an issue with the Engine Control Module (ECM).

4. How can I diagnose and repair OBDII code P2628 in my GMC vehicle?

Diagnosing and repairing OBDII code P2628 involves checking the oxygen sensor and its related circuit for any faults, testing the oxygen sensor pump, inspecting the wiring and connectors for damage, and verifying the operation of the ECM.

5. Can I continue driving my GMC with OBDII code P2628 present?

It is not recommended to continue driving your GMC with OBDII code P2628 present, as it can lead to poor engine performance, reduced fuel efficiency, and potential damage to other components over time. It is best to address the issue promptly.

6. How much does it typically cost to repair OBDII code P2628 in a GMC?

The cost to repair OBDII code P2628 in a GMC can vary depending on the specific cause of the issue, the parts needed for repair, and labor costs. It is advisable to consult with a professional mechanic for an accurate estimate.

7. Can a DIY enthusiast fix OBDII code P2628 in a GMC?

While some DIY enthusiasts may have the skills to diagnose and repair OBDII code P2628 in a GMC, it is a complex issue that may require specialized tools and knowledge. It is recommended to seek assistance from a qualified mechanic for proper diagnosis and repair.

8. How urgent is it to address OBDII code P2628 in a GMC?

It is important to address OBDII code P2628 in a GMC promptly to prevent further damage to the vehicle's components and ensure optimal engine performance. Ignoring the issue can lead to more serious problems down the line.

9. Is OBDII code P2628 a common issue in GMC vehicles?

OBDII code P2628 related to the HO2S Pump Current Trim Circuit High Voltage Sensor 1 is not as common as some other codes, but it can still occur in GMC vehicles due to various factors such as sensor wear, electrical issues, or ECM malfunctions.

10. Can resetting the Check Engine Light resolve OBDII code P2628 in a GMC?

Simply resetting the Check Engine Light will not resolve OBDII code P2628 in a GMC. The underlying issue causing the fault code must be diagnosed and repaired to ensure the problem is resolved.

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