AutoCodes – RAM – P203C RAM

P203C RAM 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: P203C RAM 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 399

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 P203C 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 below 0.3 volts for one second.

OBDII Code P203C RAM - Reductant Level Sensor Circuit Low - AutoCodes.com — P203C RAM Code - Reductant Level Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC P203C 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 P203C 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 P203C 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 P203C RAM Code

1. What are the common symptoms of OBDII code P203C (RAM) indicating a Reductant Level Sensor Circuit Low issue?

- Common symptoms include the Malfunction Indicator Lamp (MIL) or Check Engine Light illuminating, reduced engine performance, and potential difficulty starting the vehicle.

2. What are the possible causes of OBDII code P203C (RAM) related to the Reductant Level Sensor Circuit Low?

- Possible causes include a faulty reductant level sensor, damaged wiring or connectors in the sensor circuit, low reductant fluid level, or a malfunctioning Engine Control Module (ECM).

3. How can I diagnose the issue causing OBDII code P203C (RAM) to appear for the Reductant Level Sensor Circuit Low?

- Diagnosis typically involves using a scan tool to read the code, inspecting the reductant level sensor and its wiring for damage, checking the reductant fluid level, and testing the sensor's resistance.

4. Can I continue driving my vehicle with OBDII code P203C (RAM) indicating a Reductant Level Sensor Circuit Low issue?

- It is not recommended to continue driving with this code present, as it may lead to more severe issues with the vehicle's emissions system if left unaddressed.

5. What is the typical repair process for resolving OBDII code P203C (RAM) due to a Reductant Level Sensor Circuit Low problem?

- The repair process may involve replacing the faulty reductant level sensor, repairing any damaged wiring or connectors, refilling the reductant fluid tank, and clearing the error code from the ECM.

6. Are there any DIY tips for addressing OBDII code P203C (RAM) related to the Reductant Level Sensor Circuit Low issue?

- DIY tips may include checking the reductant fluid level, visually inspecting the sensor and its wiring for visible damage, and ensuring the connections are secure before seeking professional help if needed.

7. How critical is it to fix OBDII code P203C (RAM) for the Reductant Level Sensor Circuit Low issue promptly?

- It is essential to address this issue promptly to prevent potential damage to the vehicle's emissions system and ensure optimal engine performance.

8. Can a faulty reductant level sensor cause other problems in the vehicle besides triggering OBDII code P203C (RAM)?

- Yes, a faulty reductant level sensor can lead to improper DEF (diesel exhaust fluid) usage, incorrect emissions control, and potential damage to the vehicle's catalytic converter if not addressed promptly.

9. How much does it typically cost to repair OBDII code P203C (RAM) indicating a Reductant Level Sensor Circuit Low issue?

- Repair costs can vary depending on the extent of the issue, but it may range from $100 to $300 for parts and labor to replace the reductant level sensor and address any related wiring issues.

10. Are there any preventative measures to avoid encountering OBDII code P203C (RAM) due to a Reductant Level Sensor Circuit Low problem in the future?

- Regularly checking the reductant fluid level, inspecting the sensor and its wiring during routine maintenance, and promptly addressing any warning lights related to the emissions system can help prevent this issue from occurring.