AutoCodes – Dodge – P1622 Dodge

P1622 Dodge Code - Oxygen Sensor Reference Voltage Circuit High

Quick Answer

O2 Sensor Heater Operation: For a typical Switching (4 Wire) Oxygen (O2) Sensor output signal to function the sense element must be heated to operating temperature. Common causes include Faulty Any Downstream or Upstream O2 Sensor, Any Downstream or Upstream O2 Sensor harness is open or shorted, Any Downstream or Upstream O2 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: P1622 Dodge indicates Oxygen Sensor Reference Voltage Circuit High.
Common causes: Common causes include Faulty Any Downstream or Upstream O2 Sensor, Any Downstream or Upstream O2 Sensor harness is open or shorted, Any Downstream or Upstream O2 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 4,664

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Mar 23, 2022

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1622 Dodge Description

O2 Sensor Heater Operation: For a typical Switching (4 Wire) Oxygen (O2) Sensor output signal to function the sense element must be heated to operating temperature. A resistive heater element is incorporated within the sensor to allow for rapid heating of the sensor to reach operating temperature faster and closed-loop fuel control. The O2 Sensor Heater resistance is directly proportional to the heater temperature, meaning that as heater temperature increases, the heater resistance increases. The Powertrain Control Module (PCM) makes a calculation to determine the heater resistance and temperature. The heater resistance is calculated by measuring the battery voltage and current draw on the heater control circuit, Then the heater temperature is determined using the resistance versus temperature characteristic. The heater temperature is monitored continuously, and the heating rate is adjusted using Pulse Width Modulation (PWM) to prevent damaging the heating element. If the PCM detects a fault in the O2 Sensor heater circuitry the internal PCM driver is disabled during the current ignition cycle. The Diagnostic Trouble Code (DTC) will be set when Sensor Return circuit voltage is above approximately 3.7 volts for 9.0 seconds.

OBDII Code P1622 Dodge - Oxygen Sensor Reference Voltage Circuit High - AutoCodes.com — P1622 Dodge Code - Oxygen Sensor Reference Voltage Circuit High

What does this mean?

What are the Possible Causes of the DTC P1622 Dodge?

Faulty Any Downstream or Upstream O2 Sensor
Any Downstream or Upstream O2 Sensor harness is open or shorted
Any Downstream or Upstream O2 Sensor circuit poor electrical connection

How to Fix the DTC P1622 Dodge?

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 P1622 Dodge 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 P1622 Dodge Code

1. What are the common symptoms of OBDII code P1622 in a Dodge related to the Oxygen Sensor Reference Voltage Circuit High?

Symptoms may include poor engine performance, decreased fuel efficiency, rough idling, and the illumination of the check engine light.

2. What are some possible causes of the Oxygen Sensor Reference Voltage Circuit High code (P1622) in a Dodge?

Potential causes include a faulty oxygen sensor, damaged wiring or connectors in the oxygen sensor circuit, a malfunctioning powertrain control module (PCM), or a short circuit in the system.

3. How can I diagnose the issue causing OBDII code P1622 in my Dodge related to the Oxygen Sensor Reference Voltage Circuit High?

Diagnosis typically involves using a scan tool to retrieve the specific fault code, inspecting the oxygen sensor and its wiring for damage, testing the sensor's voltage output, and checking the PCM for any related issues.

4. Can I continue driving my Dodge with the P1622 code related to the Oxygen Sensor Reference Voltage Circuit High?

While it may be possible to drive the vehicle with this code present, it is recommended to address the issue promptly to prevent potential damage to the engine or catalytic converter.

5. Is it necessary to replace the oxygen sensor when dealing with OBDII code P1622 in a Dodge?

In many cases, replacing the oxygen sensor is the most effective solution for resolving the P1622 code. However, it's important to diagnose the issue accurately before proceeding with any repairs.

6. Are there any DIY repair tips for fixing the Oxygen Sensor Reference Voltage Circuit High code (P1622) in my Dodge?

DIY repair tips may include checking and cleaning the oxygen sensor connectors, inspecting the wiring for any visible damage, and ensuring proper grounding of the sensor.

7. How much does it typically cost to repair OBDII code P1622 related to the Oxygen Sensor Reference Voltage Circuit High in a Dodge?

The cost of repairs can vary depending on the underlying cause of the issue. Costs may include parts such as a new oxygen sensor, labor for diagnostic testing and installation, and potential fees for resetting the fault code.

8. Can a faulty oxygen sensor cause other issues besides triggering the P1622 code in a Dodge?

Yes, a faulty oxygen sensor can lead to various problems, including reduced fuel efficiency, increased emissions, engine misfires, and potential damage to the catalytic converter over time.

9. How long does it usually take to repair OBDII code P1622 related to the Oxygen Sensor Reference Voltage Circuit High in a Dodge?

The repair time can vary based on the specific cause of the issue and the complexity of the repair process. In general, it may take anywhere from 1 to 3 hours to complete the necessary repairs.

10. Will resetting the check engine light resolve the P1622 code related to the Oxygen Sensor Reference Voltage Circuit High in my Dodge?

Resetting the check engine light may temporarily clear the code, but it will not fix the underlying issue causing the fault code to appear. It's essential to diagnose and address the root cause of the problem for a lasting solution.