AutoCodes – Hyundai – P2255 Hyundai

P2255 Hyundai Code - O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1

Quick Answer

The Front Oxygen Sensor (O2 Sensor 1) is placed into the exhaust manifold. Common causes include Faulty Front Oxygen Sensor Bank 2, Front Oxygen Sensor Bank 2 harness is open or shorted, Front Oxygen Sensor Bank 2 circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

What it means: P2255 Hyundai indicates O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1.
Common causes: Common causes include Faulty Front Oxygen Sensor Bank 2, Front Oxygen Sensor Bank 2 harness is open or shorted, Front Oxygen Sensor Bank 2 circuit poor electrical connection.
Severity: Moderate - service should be scheduled soon.
Can I drive?: The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.

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Code Popularity 1,461

How popular is this code, among other codes? Low

Repair Importance Level

Moderate (Service soon) (2 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2255 Hyundai Description

The Front Oxygen Sensor (O2 Sensor 1) is placed into the exhaust manifold. It detects the amount of oxygen in the exhaust gas compared to the outside air. The heated oxygen sensor 1 has a closed-end tube made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. The heated oxygen sensor 1 signal is sent to the Engine Control Module (ECM). The ECM adjusts the injection pulse duration to achieve the ideal air-fuel ratio. The ideal air-fuel ratio occurs near the radical change from 1V to 0V.

OBDII Code P2255 Hyundai - O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1 - AutoCodes.com — P2255 Hyundai Code - O2 Sensor Negative Current Control Circuit Low Bank 2 Sensor 1

What does this mean?

What are the Possible Causes of the DTC P2255 Hyundai?

Faulty Front Oxygen Sensor Bank 2
Front Oxygen Sensor Bank 2 harness is open or shorted
Front Oxygen Sensor Bank 2 circuit poor electrical connection

How to Fix the DTC P2255 Hyundai?

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 P2255 Hyundai 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 P2255 Hyundai Code

1. What does the OBDII code P2255 mean on a Hyundai?

P2255 indicates an issue with the O2 sensor negative current control circuit for Bank 2 Sensor 1, meaning the voltage or current in the circuit is lower than expected.

2. What are the symptoms of code P2255 in a Hyundai?

Common symptoms include poor fuel efficiency, rough idling, engine hesitation, reduced performance, and the Check Engine Light illuminating.

3. What causes the P2255 code to appear in a Hyundai?

Potential causes include a faulty O2 sensor, damaged wiring or connectors, corrosion in the circuit, or a malfunctioning PCM (Powertrain Control Module).

4. How do I fix the P2255 code in my Hyundai?

Repairs may involve replacing the Bank 2 Sensor 1 oxygen sensor, repairing or replacing damaged wiring, cleaning corroded connectors, or reprogramming or replacing the PCM if necessary.

5. Can I drive my Hyundai with the P2255 code?

While you may be able to drive with this code, itâ€™s not recommended as it can lead to poor fuel economy, increased emissions, and potential damage to other components.

6. How do I diagnose the P2255 code on my Hyundai?

Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the wiring and connectors, testing the O2 sensor with a multimeter, and checking for any PCM-related issues.

7. Which O2 sensor is affected by the P2255 code in a Hyundai?

The code refers to the oxygen sensor on Bank 2 (the side of the engine opposite cylinder 1), Sensor 1 (the upstream sensor before the catalytic converter).

8. How much does it cost to fix the P2255 code in a Hyundai?

The cost can range from $150 to $400 depending on whether youâ€™re replacing the oxygen sensor, repairing wiring, or addressing PCM issues.

9. Can a dirty air filter cause the P2255 code in a Hyundai?

While unlikely, a dirty air filter can indirectly affect engine performance, which might contribute to O2 sensor issues. Itâ€™s worth checking as part of general maintenance.

10. Is the P2255 code covered under warranty for my Hyundai?

If your vehicle is still under the emissions warranty, the repair may be covered. Check with your Hyundai dealer for specific warranty details.