AutoCodes – Generic – P202B

P202B Code - Reductant Tank Heater Control Circuit Low

Quick Answer

The tank heater is located in close proximity to the tank temperature sensor. Common causes include Faulty Reductant Tank Heater, Reductant Tank Heater harness is open or shorted, Reductant Tank Heater 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: P202B indicates Reductant Tank Heater Control Circuit Low.
Common causes: Common causes include Faulty Reductant Tank Heater, Reductant Tank Heater harness is open or shorted, Reductant Tank Heater 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 28,423

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P202B Description

The tank heater is located in close proximity to the tank temperature sensor. Therefore the tank temperature sensor can be used to monitor the tank heater performance.
When the tank heater is activated, the tank temperature is expected to rise. If this is not the case a fault will be set. If the vehicle is operated for several consecutive short drive cycles, the test may require more than one drive cycle to complete.

OBDII Code P202B - Reductant Tank Heater Control Circuit Low - AutoCodes.com — P202B Code - Reductant Tank Heater Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P202B?

Faulty Reductant Tank Heater
Reductant Tank Heater harness is open or shorted
Reductant Tank Heater circuit poor electrical connection

How to Fix the DTC P202B?

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 P202B 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.

Need more information about the P202B code?

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Information for Specific Makes

P202B Audi — Reductant Tank Heater Control Circuit Low
P202B Ford — Reductant Tank Heater Control Circuit Low
P202B Volkswagen — Reductant Tank Heater Control Circuit Low

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.