AutoCodes – Generic – P203F

P203F Code - Reductant Level Sensor Circuit Low

Quick Answer

The Diesel Exhaust Fluid (DEF) Tank Level Sensor and Diesel Exhaust Fluid (DEF) Tank Temperature Sensor are to measure the level and temperature of the fluid inside the DEF Tank. Common causes include Faulty Reductant Level Sensor, Reductant Level Sensor harness is open or shorted, Reductant Level 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: P203F indicates Reductant Level Sensor Circuit Low.
Common causes: Common causes include Faulty Reductant Level Sensor, Reductant Level Sensor harness is open or shorted, Reductant Level 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 30,503

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 Dec 23, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P203F Description

The Diesel Exhaust Fluid (DEF) Tank Level Sensor and Diesel Exhaust Fluid (DEF) Tank Temperature Sensor are to measure the level and temperature of the fluid inside the DEF Tank. Though integrated with the DEF Supply Pump the level sensor and the temperature sensor operate independently. The temperature sensor operates as a typical two-wire 5-Volt sensor. The level sensor operates as a typical three-wire 5-Volt sensor. The DEF Tank Temperature Sensor is a negative temperature coefficient sensor. The sensors are not sold separately and must be replaced with the DEF Supply Pump assembly. 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 for two consecutive trips. The PCM will turn off the MIL lamp immediately after the diagnostic runs and passes. Engine torque will be reduced if the engine is operated for an extended period of time with this fault active.

OBDII Code P203F - Reductant Level Sensor Circuit Low - AutoCodes.com — P203F Code - Reductant Level Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P203F?

Faulty Reductant Level Sensor
Reductant Level Sensor harness is open or shorted
Reductant Level Sensor circuit poor electrical connection

How to Fix the DTC P203F?

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 P203F 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 P203F code?

Need more information on how to fix the P203F code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P203F code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P203F Audi — Reductant Level Too Low
P203F BMW — Reductant Level Too Low
P203F Dodge — Reductant Level Sensor Circuit Too Low
P203F Ford — Reductant Level Too Low
P203F RAM — Reductant Level Sensor Circuit Too Low
P203F Volkswagen — Reductant Level Too 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.

Frequently Asked Questions about P203F Code

1. What are the common symptoms of OBDII code P203F (Reductant Level Sensor Circuit Low)?

The common symptoms include the check engine light coming on, reduced engine performance, and potential difficulty starting the vehicle.

2. What can cause the OBDII code P203F to trigger?

The code P203F is typically triggered by a faulty reductant level sensor, wiring issues in the sensor circuit, or low reductant fluid levels.

3. How serious is the OBDII code P203F (Reductant Level Sensor Circuit Low)?

While the vehicle may still be operable with this code, it is important to address it promptly to prevent potential damage to the emission control system and ensure compliance with environmental regulations.

4. How can I diagnose the OBDII code P203F?

Diagnosing the code P203F involves using an OBDII scanner to retrieve the code, inspecting the reductant fluid level, testing the reductant level sensor, and checking the sensor circuit for any faults.

5. Can I continue driving with the OBDII code P203F?

It is generally not recommended to continue driving with the code P203F unresolved to avoid potential issues with the vehicle's emission system and ensure optimal engine performance.

6. What are some possible repair tips for OBDII code P203F?

Repair tips for code P203F may include replacing the reductant level sensor, repairing damaged wiring in the sensor circuit, ensuring proper reductant fluid levels, and clearing the code with an OBDII scanner after repairs.

7. Is it possible to reset the OBDII code P203F without fixing the underlying issue?

While clearing the code temporarily with an OBDII scanner is possible, it is essential to address the root cause of the issue to prevent the code from reoccurring and potentially causing more significant problems.

8. Can a DIY enthusiast fix the OBDII code P203F at home?

Depending on their skill level and access to tools, a knowledgeable DIY enthusiast may be able to diagnose and repair the code P203F at home. However, if unsure, it is recommended to seek professional help.

9. How much does it cost to repair the OBDII code P203F?

The cost of repairing the code P203F can vary depending on the exact cause of the issue, the parts needed for repair, and whether the repair is done at a dealership, mechanic shop, or DIY.

10. How long does it typically take to repair the OBDII code P203F?

The repair time for the code P203F can vary based on the complexity of the issue, availability of parts, and the expertise of the person performing the repair. It can range from a quick fix to a more involved repair requiring several hours.