AutoCodes – RAM – P203F RAM

P203F RAM 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 RAM 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 2,531

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

What does this mean?

What are the Possible Causes of the DTC P203F RAM?

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 RAM?

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 RAM 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 RAM Code

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

The common symptoms include the check engine light illuminating, reduced engine performance, and potential issues with the Selective Catalytic Reduction (SCR) system.

2. What are the possible causes of OBDII code P203F RAM?

Potential causes include a faulty reductant level sensor, damaged wiring or connectors in the reductant level sensor circuit, low reductant fluid level, or a malfunctioning SCR system.

3. How can I diagnose the issue related to OBDII code P203F RAM?

Diagnosis involves using a scan tool to read the code, inspecting the reductant fluid level, checking the wiring and connectors of the reductant level sensor, and testing the sensor itself for proper functionality.

4. What are the repair options for OBDII code P203F RAM?

Repair options may include replacing the reductant level sensor, repairing or replacing damaged wiring or connectors, refilling the reductant fluid, and addressing any issues within the SCR system.

5. Can I continue driving my vehicle with OBDII code P203F RAM?

It is not recommended to continue driving the vehicle with this code present, as it may lead to reduced engine performance and potential damage to the SCR system.

6. How much does it typically cost to repair OBDII code P203F RAM?

The cost of repairs can vary depending on the specific issue causing the code, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Will resetting the check engine light make OBDII code P203F RAM go away?

Resetting the check engine light may temporarily turn it off, but if the underlying issue causing the code is not addressed, the light is likely to come back on.

8. How often does OBDII code P203F RAM occur in vehicles?

This code is relatively uncommon compared to other OBDII codes but can still occur in vehicles equipped with a reductant level sensor and SCR system.

9. Can I prevent OBDII code P203F RAM from occurring in the future?

Regular maintenance of the SCR system, including checking reductant fluid levels and ensuring the sensor is functioning correctly, can help prevent this code from occurring.

10. Is OBDII code P203F RAM a serious issue that requires immediate attention?

While the severity of the issue may vary, it is generally recommended to address this code promptly to prevent potential damage to the emissions system and ensure optimal vehicle performance.