AutoCodes – Dodge – P203F Dodge

P203F Dodge Code - Reductant Level Sensor Circuit Too Low

Quick Answer

The Diesel Exhaust Fluid (DEF) system holds a total of 5.7 gallons of fluid on a regular cab and 9.2 gallons of fluid on a chassis cab vehicle. 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 Dodge indicates Reductant Level Sensor Circuit Too 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 15,030

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 Dec 23, 2021

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

The Diesel Exhaust Fluid (DEF) system holds a total of 5.7 gallons of fluid on a regular cab and 9.2 gallons of fluid on a chassis cab vehicle. There are a series of three warning levels to indicate to the customer when the fluid is low or incorrect. The driver warning and inducement strategy for a low fluid condition is as follows: The first warning will occur when the tank level is at approximately two gallons. The customer will hear a chime and get an EVIC message reading "DEF Low REFILL Soon". The second warning level will occur when the tank level is at approximately 1.5 gallons. The customer will hear a chime and get an EVIC message reading "Speed Limited to 5 mph in XXX MILES Refill DEF". The customer will hear a chime and get an EVIC message reading "5 mph Max Speed Refill DEF". The system will arrive at this level with approximately 0.7 gallons of fluid left in the tank. A minimum of two and a half gallons of approved Diesel Exhaust Fluid is added to the tank to eliminate the 5 mph derate. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit detects that the DEF Tank is low.

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

What does this mean?

What are the Possible Causes of the DTC P203F Dodge?

Faulty Reductant Level Sensor
Reductant Level Sensor harness is open or shorted
Reductant Level Sensor circuit poor electrical connection
Faulty DEF Supply Pump Assembly
Faulty Diesel Exhaust Fluid Dosing Control Unit

How to Fix the DTC P203F 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 P203F 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 P203F Dodge Code

1. What does the OBDII code P203F mean on a Dodge vehicle?

P203F indicates an issue with the reductant level sensor circuit, specifically that the sensor is reading too low, which may affect the diesel exhaust fluid (DEF) system.

2. What are the common symptoms of code P203F in a Dodge?

Symptoms include the check engine light turning on, DEF system warnings, reduced engine power, and possible activation of a limp mode.

3. What causes the P203F code to appear?

Common causes include a faulty reductant level sensor, damaged wiring or connectors in the sensor circuit, a malfunctioning DEF tank heater, or low DEF levels.

4. Can low DEF levels trigger the P203F code?

Yes, low DEF levels can trigger the P203F code, as the reductant level sensor may interpret this as a circuit issue.

5. How do you diagnose a P203F code on a Dodge?

Diagnosis involves checking the DEF level, inspecting the wiring and connectors for damage, testing the reductant level sensor, and scanning for related codes.

6. Can I still drive my Dodge if the P203F code is active?

You can drive temporarily, but ignoring the issue may lead to reduced engine performance or limp mode activation, especially if DEF levels are low.

7. How is the P203F code fixed?

Repairs may include refilling the DEF tank, replacing the reductant level sensor, repairing damaged wiring, or replacing the DEF tank heater if needed.

8. Does the P203F code always require sensor replacement?

No, sometimes the issue is caused by a wiring problem, low DEF levels, or other components rather than the sensor itself.

9. How much does it cost to repair the P203F code on a Dodge?

Costs vary depending on the cause but can range from $100 to $500 or more for parts and labor, especially if the DEF tank or sensor requires replacement.

10. Can a software update resolve the P203F code?

In some cases, a software update from the dealership may address sensor calibration issues or improve DEF system performance.