AutoCodes – Dodge – P20B7 Dodge

P20B7 Dodge Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low

Quick Answer

The Powertrain Control Module (PCM) controls the Diesel Exhaust Fluid (DEF) Heaters via datalink communication with the Diesel Exhaust Fluid Dosing Control Unit (DEF DCU - sometimes referred to as the Selective Catalytic Reduction (SCR) Module). Common causes include Selective Catalytic Reduction (SCR) Module Circuit, Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU), Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted. 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: P20B7 Dodge indicates Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low.
Common causes: Common causes include Selective Catalytic Reduction (SCR) Module Circuit, Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU), Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted.
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 357

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 13, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P20B7 Dodge Description

The Powertrain Control Module (PCM) controls the Diesel Exhaust Fluid (DEF) Heaters via datalink communication with the Diesel Exhaust Fluid Dosing Control Unit (DEF DCU - sometimes referred to as the Selective Catalytic Reduction (SCR) Module). The DEF DCU receives two voltage supplies: One from the SCR Relay 1 (which is activated upon startup). And the other is a fused B+ supply. The DEF Tank electric heater and DEF Line Heater power supply and ground circuits are wired directly to the DCU. The DEF Tank Heater is integrated into the DEF Supply Pump assembly and is not serviced separately.
Activation of the DEF Supply Line and DEF Tank Heaters operate independently of each other. Line heating is based on the Ambient Temperature Sensor input and Tank heating is based on the DEF Tank Temperature Sensor value. Heating of the Line or Tank Heater is initiated when the corresponding temperature value is below -5°C (23°F). Heating stops when the corresponding temperature value goes above -4°C (24.8°F). The DEF Dosing Control Unit monitors these inputs and reports them to the Powertrain Control Module (PCM). The PCM will illuminate the MIL lamp after this diagnostic runs and fails. The PCM will turn off the MIL light when the monitor runs and passes in three consecutive key cycles. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit detects low voltage on the SCR Module Heater Supply circuit.

OBDII Code P20B7 Dodge - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low - AutoCodes.com — P20B7 Dodge Code - Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P20B7 Dodge?

Selective Catalytic Reduction (SCR) Module Circuit
Faulty Diesel Exhaust Fluid Dosing Control Unit (DEF DCU)
Diesel Exhaust Fluid Dosing Control Unit harness is open or shorted
Diesel Exhaust Fluid Dosing Control Unit circuit poor electrical connection
Faulty Power Distribution Center

How to Fix the DTC P20B7 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 P20B7 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 P20B7 Dodge Code

1. What are common symptoms of OBDII code P20B7 in a Dodge related to the Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low?

The common symptoms include the check engine light being illuminated, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What are some possible causes of the OBDII code P20B7 in a Dodge truck?

Possible causes include a faulty reductant pump heater, damaged wiring or connectors in the heater circuit, a malfunctioning reductant pump, or a problem with the powertrain control module.

3. How can I diagnose the OBDII code P20B7 in my Dodge related to the Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low?

Diagnosis typically involves using a scan tool to read the code, checking the reductant pump heater fuse, inspecting the wiring and connectors for damage, and testing the reductant pump heater for proper operation.

4. Can I continue to drive my Dodge with the OBDII code P20B7 present?

It is not recommended to continue driving your vehicle with this code present, as it can lead to increased emissions and potential damage to the emissions system. It is best to address the issue promptly.

5. How can I repair the OBDII code P20B7 in my Dodge truck?

Repairing this code may involve replacing the reductant pump heater, repairing or replacing damaged wiring or connectors, addressing any issues with the reductant pump, or reprogramming the powertrain control module if necessary.

6. Are there any DIY tips for fixing the OBDII code P20B7 in my Dodge related to the Diesel Exhaust Fluid Reductant Pump Heater Control Circuit Low?

While some aspects of diagnosing and repairing this code may be done by DIY enthusiasts, it is recommended to consult a professional mechanic or dealership for accurate diagnosis and repair to ensure the issue is properly resolved.

7. Will resetting the OBDII code P20B7 in my Dodge make it go away permanently?

Resetting the code may temporarily turn off the check engine light, but if the underlying issue causing the code is not addressed, it is likely to reappear. It is important to diagnose and repair the root cause of the code.

8. How much does it typically cost to repair the OBDII code P20B7 in a Dodge truck?

The cost of repairing this code can vary depending on the specific cause of the issue, the labor rates of the repair shop, and the cost of any necessary parts. It is advisable to obtain quotes from different repair facilities.

9. Can the OBDII code P20B7 in a Dodge be related to other emission system problems?

Yes, this code is related to the emissions system, specifically the Diesel Exhaust Fluid reductant system. It is possible for issues with this system to affect the overall performance and emissions of the vehicle.

10. Is it necessary to address the OBDII code P20B7 in a Dodge immediately?

It is recommended to address this code promptly to prevent any potential damage to the emissions system and to ensure the vehicle is operating efficiently. Ignoring the issue may lead to increased emissions and decreased performance.