AutoCodes – RAM – P203D RAM

P203D RAM Code - Reductant Level Sensor Circuit High

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: P203D RAM indicates Reductant Level Sensor Circuit High.
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 719

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 P203D RAM 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. The Diagnostic Trouble Code (DTC) will be set when the DEF Dosing Control Unit detects that the DEF Tank Level Sensor Signal circuit is above 4.8 volts for one second.

OBDII Code P203D RAM - Reductant Level Sensor Circuit High - AutoCodes.com — P203D RAM Code - Reductant Level Sensor Circuit High

What does this mean?

What are the Possible Causes of the DTC P203D 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 P203D 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 P203D 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 P203D RAM Code

1. What are the common symptoms of OBDII code P203D RAM (Reductant Level Sensor Circuit High)?

The common symptoms of this code may include illuminated Check Engine Light, decreased fuel efficiency, and potential issues with the Selective Catalytic Reduction (SCR) system.

2. What could cause the OBDII code P203D RAM to trigger?

The code P203D RAM is usually triggered by a malfunction in the reductant level sensor circuit, which could be caused by sensor failure, wiring issues, or problems with the SCR system.

3. How can I diagnose the cause of the OBDII code P203D RAM?

To diagnose the cause of the code P203D RAM, you may need to perform a thorough inspection of the reductant level sensor, check for wiring faults, and test the SCR system components for proper functionality.

4. Is it safe to continue driving with the OBDII code P203D RAM active?

It's not recommended to drive with the code P203D RAM active, as it can lead to potential issues with emissions control and engine performance. It's advisable to address the underlying problem promptly.

5. What are some repair tips for fixing the OBDII code P203D RAM?

Repairing the OBDII code P203D RAM may involve replacing the reductant level sensor, repairing any damaged wiring, or addressing issues with the SCR system components. It's advisable to seek professional help for an accurate diagnosis and repair.

6. Can I reset the OBDII code P203D RAM without fixing the underlying issue?

Resetting the code without addressing the underlying issue will only temporarily clear the Check Engine Light. The code is likely to reappear if the root cause is not fixed.

7. How much does it typically cost to repair the OBDII code P203D RAM?

The cost of repairing the OBDII code P203D RAM can vary depending on the extent of the issue and the parts required for the repair. It's advisable to consult a mechanic for a more accurate cost estimate.

8. Are there any preventive measures to avoid the OBDII code P203D RAM in the future?

Regular maintenance of the SCR system, including checking the reductant level sensor and wiring, can help prevent issues that may trigger the OBDII code P203D RAM. Following the manufacturer's recommended maintenance schedule is crucial.

9. Can a DIY enthusiast fix the OBDII code P203D RAM at home?

While some DIY enthusiasts may have the skills to diagnose and repair the OBDII code P203D RAM, it's recommended to seek professional help, especially when dealing with complex emission control systems like the SCR system.

10. How long does it take to repair the OBDII code P203D RAM?

The repair time for the OBDII code P203D RAM can vary based on the specific cause of the issue and the extent of the repair needed. It's best to consult a mechanic for a more accurate time estimate.