AutoCodes – Generic – P20B2

P20B2 Code - Diesel Exhaust Fluid Reductant Heater Control Valve Performance

Quick Answer

The Diesel Exhaust Fluid (DEF) Tank Level Sensor and Diesel Exhaust Fluid (DEF) Tank Temperature Sensor are a combination sensor used to measure the level and temperature of the fluid in the DEF Tank. Common causes include Faulty Diesel Exhaust Fluid Reductant Heater Control Valve, Diesel Exhaust Fluid Reductant Heater Control Valve harness is open or shorted, Diesel Exhaust Fluid Reductant Heater Control Valve 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: P20B2 indicates Diesel Exhaust Fluid Reductant Heater Control Valve Performance.
Common causes: Common causes include Faulty Diesel Exhaust Fluid Reductant Heater Control Valve, Diesel Exhaust Fluid Reductant Heater Control Valve harness is open or shorted, Diesel Exhaust Fluid Reductant Heater Control Valve 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 8,992

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 Jul 15, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20B2 Description

The Diesel Exhaust Fluid (DEF) Tank Level Sensor and Diesel Exhaust Fluid (DEF) Tank Temperature Sensor are a combination sensor used to measure the level and temperature of the fluid in the DEF Tank. Though combined, the level sensor and the temperature sensor operate independently of each other. Both sensors operate as a two-wire 5-Volt sensor. The DEF Tank Level Sensor is a 14-point magnetic reed switch sensor. The DEF Tank Temperature Sensor is a negative temperature coefficient sensor. The DEF Dosing Control Unit will illuminate the MIL lamp via the Powertrain Control Module (PCM) immediately after this diagnostic runs and fails. The DEF Dosing Control Unit will turn off the MIL lamp via the PCM immediately after the diagnostic runs and passes in three consecutive key cycles. This monitor runs a short time after Diesel Exhaust Fluid Tank heating is commanded. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit does not detect a corresponding temperature increase by the DEF Tank Temperature Sensor after the Diesel Exhaust Fluid Tank heating is commanded on.

OBDII Code P20B2 - Diesel Exhaust Fluid Reductant Heater Control Valve Performance - AutoCodes.com — P20B2 Code - Diesel Exhaust Fluid Reductant Heater Control Valve Performance

What does this mean?

What are the Possible Causes of the DTC P20B2?

Faulty Diesel Exhaust Fluid Reductant Heater Control Valve
Diesel Exhaust Fluid Reductant Heater Control Valve harness is open or shorted
Diesel Exhaust Fluid Reductant Heater Control Valve circuit poor electrical connection

How to Fix the DTC P20B2?

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 P20B2 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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Information for Specific Makes

P20B2 Dodge — Diesel Exhaust Fluid Reductant Heater Control Valve Performance
P20B2 RAM — Diesel Exhaust Fluid Reductant Heater Control Valve Performance

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 P20B2 Code

1. What are the common symptoms of OBDII code P20B2 (Diesel Exhaust Fluid Reductant Heater Control Valve Performance)?

The common symptoms include the check engine light coming on, reduced engine performance, and potential issues with the diesel exhaust fluid system.

2. What are the possible causes of OBDII code P20B2?

The code P20B2 can be triggered by issues such as a faulty reductant heater control valve, wiring problems, a malfunctioning reductant heater, or a software issue in the engine control module.

3. How can I diagnose the cause of OBDII code P20B2?

Diagnosing the cause of P20B2 typically involves using a scan tool to read the code and accessing the reductant heater control valve to check for any visible damage or wiring issues. It may also involve testing the reductant heater for proper functionality.

4. What are some repair tips for resolving OBDII code P20B2?

Common repair solutions include replacing the faulty reductant heater control valve, repairing any damaged wiring, checking and replacing the reductant heater if needed, and updating the engine control module software if a software issue is suspected.

5. Can OBDII code P20B2 cause any long-term damage if left unresolved?

Continuing to drive with OBDII code P20B2 unresolved can potentially lead to more severe issues with the diesel exhaust fluid system, reduced engine performance, and increased emissions. It is recommended to address the problem promptly.

6. How much does it typically cost to repair OBDII code P20B2?

The cost of repairing OBDII code P20B2 can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts. It is advisable to consult with a mechanic for an accurate estimate.

7. Can I reset OBDII code P20B2 on my own?

While you can clear the code using an OBDII scan tool, it is important to address the underlying issue causing the code before resetting it. Simply clearing the code without fixing the problem may lead to it reoccurring.

8. Is OBDII code P20B2 specific to certain vehicle makes and models?

OBDII code P20B2 related to Diesel Exhaust Fluid Reductant Heater Control Valve Performance can be found in vehicles equipped with diesel engines that utilize a reductant system. It is not specific to any particular make or model.

9. Are there any preventive maintenance measures to avoid OBDII code P20B2?

Regularly servicing and maintaining your vehicle's diesel exhaust fluid system, including checking the reductant heater control valve and associated components, can help prevent issues that may trigger OBDII code P20B2.

10. Can I drive my vehicle with OBDII code P20B2 present?

It is generally not recommended to drive with OBDII code P20B2 present, as it can affect the performance and emissions of your vehicle. It is best to have the issue diagnosed and repaired before continuing to drive.