AutoCodes – Audi – P202A Audi

P202A Audi Code - Reductant Tank Heater Control Circuit/Open

Quick Answer

Check the tank connections, and power and grounds to the Reduction Agent Tank Module. 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: P202A Audi indicates Reductant Tank Heater Control Circuit/Open.
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 2,876

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
FAQs
Comments
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Code P202A Audi Description

Check the tank connections, and power and grounds to the Reduction Agent Tank Module. If all voltage and ground inputs to the module are present, replace the Reduction Agent Tank Module assembly.

OBDII Code P202A Audi - Reductant Tank Heater Control Circuit/Open - AutoCodes.com — P202A Audi Code - Reductant Tank Heater Control Circuit/Open

What does this mean?

What are the Possible Causes of the DTC P202A Audi?

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

How to Fix the DTC P202A Audi?

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 P202A Audi 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 P202A Audi Code

1. What does the OBDII code P202A mean on an Audi?

P202A indicates an issue with the Reductant Tank Heater Control Circuit, often signaling an open circuit or malfunction in the heater that warms the DEF (Diesel Exhaust Fluid) tank.

2. What are the common symptoms of code P202A in an Audi?

Symptoms may include the Check Engine Light turning on, poor DEF system performance, reduced fuel efficiency, or warnings related to the emissions system.

3. What causes the P202A code to appear?

This code can be triggered by a faulty reductant tank heater, damaged wiring or connectors in the control circuit, or a failed control module.

4. Can I drive my Audi with the P202A code?

While the car may still be drivable, ignoring the code can lead to increased emissions, potential limp mode activation, and difficulty passing emissions tests.

5. How is the P202A code diagnosed?

A technician will inspect the wiring and connectors, test the reductant tank heater for proper function, and use a scan tool to monitor the control circuit.

6. What repairs can fix the P202A code on an Audi?

Repairs may include replacing the reductant tank heater, repairing damaged wiring, cleaning corroded connectors, or reprogramming the control module if necessary.

7. How much does it cost to fix the P202A code on an Audi?

Repair costs vary but typically range from $200 to $600, depending on whether the reductant tank heater or wiring needs replacement.

8. How does the reductant tank heater work in an Audi?

The heater ensures the DEF remains in liquid form during cold temperatures, allowing the emissions system to function properly.

9. Can a dead battery cause the P202A code?

A weak or dead battery can sometimes cause communication issues or incorrect voltage readings, potentially triggering the code.

10. Is the P202A code specific to Audi vehicles?

No, the P202A code is a generic OBDII code that can occur in any diesel vehicle with a reductant system, but specific diagnostics and repairs may vary by make and model.