AutoCodes – RAM – P1622 RAM

P1622 RAM 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 RAM 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 1,016

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

What does this mean?

What are the Possible Causes of the DTC P1622 RAM?

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 RAM?

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 RAM 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 RAM Code

1. What are the common symptoms of OBDII code P1622 RAM Oxygen Sensor Reference Voltage Circuit High?

- Common symptoms include poor fuel efficiency, rough idling, and an illuminated Check Engine Light.

2. What are the possible causes of the P1622 fault code related to the oxygen sensor reference voltage circuit?

- The code can be triggered by issues such as a faulty oxygen sensor, damaged wiring, or a malfunctioning PCM.

3. How can I diagnose the P1622 RAM code for the oxygen sensor reference voltage circuit high?

- A thorough inspection of the oxygen sensor, wiring harness, and connectors is crucial to identify the root cause of the issue.

4. Is it safe to continue driving with the P1622 fault code for the oxygen sensor reference voltage circuit high?

- It is not recommended to drive with this code as it can lead to poor engine performance and potential damage over time.

5. Can I repair the P1622 RAM code related to the oxygen sensor reference voltage circuit high by myself?

- While some DIY enthusiasts may be able to address this issue, it is advisable to consult a professional mechanic for accurate diagnosis and repair.

6. What are the possible repair tips for resolving the P1622 fault code associated with the oxygen sensor reference voltage circuit?

- Repair tips may include replacing the oxygen sensor, repairing damaged wiring, or resetting the PCM to clear the code.

7. How much does it typically cost to fix the P1622 RAM code related to the oxygen sensor reference voltage circuit high?

- The cost of repairs can vary depending on the extent of the issue, the labor rates in your area, and the specific components that need to be replaced.

8. Will resetting the fault codes using an OBDII scanner resolve the P1622 code for the oxygen sensor reference voltage circuit high?

- While resetting the codes may temporarily clear the Check Engine Light, it is important to address the underlying issue causing the fault code.

9. Can extreme weather conditions impact the occurrence of the P1622 RAM fault code for the oxygen sensor reference voltage circuit high?

- Yes, extreme temperatures or moisture could potentially affect the performance of the oxygen sensor and trigger the fault code.

10. How often should I have my vehicle's oxygen sensor inspected to prevent the recurrence of the P1622 fault code?

- Regular maintenance schedules typically recommend inspecting and replacing oxygen sensors every 60,000 to 100,000 miles to maintain optimal engine performance and reduce the likelihood of fault codes like P1622.