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Engine-Codes – Generic – P203C

P203C Code - Reductant Level Sensor Circuit Low

Quick Answer

The P203C diagnostic trouble code (DTC) refers to a potential issue with the reductant level sensor circuit being detected as low. Common causes include Faulty reductant level sensor, Wiring or connector issues in the sensor circuit, DEF contamination affecting sensor readings. 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 indicates Reductant Level Sensor Circuit Low.
Common causes
Common causes include Faulty reductant level sensor, Wiring or connector issues in the sensor circuit, DEF contamination affecting sensor readings.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 10, 2024
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Code P203C Description

The P203C diagnostic trouble code (DTC) refers to a potential issue with the reductant level sensor circuit being detected as low. In vehicles equipped with selective catalytic reduction (SCR) systems, the reductant level sensor plays a crucial role in monitoring the level of diesel exhaust fluid (DEF) in the tank. DEF is essential for reducing harmful emissions by converting nitrogen oxides into harmless nitrogen and water vapor. When the reductant level sensor circuit is reading low, it means that the sensor is detecting a lower fluid level than expected, which can lead to inadequate DEF injection and, ultimately, increased emissions.

OBDII Code P203C - Reductant Level Sensor Circuit Low
P203C Code - Reductant Level Sensor Circuit Low

Common Causes of P203C

  1. Faulty reductant level sensor
  2. Wiring or connector issues in the sensor circuit
  3. DEF contamination affecting sensor readings
  4. Corrosion or damage to sensor components
  5. ECM software issues affecting sensor communication

Symptoms of P203C

  1. Check engine light illuminated on the dashboard
  2. Reduced DEF consumption
  3. Decreased fuel efficiency
  4. Engine performance issues
  5. Increased emissions output

How to Fix P203C

  1. Begin by conducting a visual inspection of the reductant level sensor and its wiring for any visible damage or corrosion.
  2. Use a multimeter to test the sensor's resistance and voltage output to determine if it is functioning within specifications.
  3. Check the DEF tank for any signs of contamination or blockages that may be affecting fluid levels.
  4. Inspect the wiring harness and connectors for any loose connections or damaged wires that could be causing circuit issues.
  5. If the sensor is found to be faulty, replace it with a new sensor and recalibrate as necessary.

Cost to Fix P203C

The cost of repairing a reductant level sensor circuit low issue can vary depending on the specific vehicle make and model, as well as the labor rates in your area. Typically, the cost of parts for a new reductant level sensor can range from $100 to $300, while labor costs can add an additional $100 to $200. Overall, the total repair cost for this issue may fall between $200 and $500, but it's essential to obtain a detailed quote from a reputable auto repair shop to get a more accurate estimate. Keep in mind that additional diagnostics and potential repairs may also impact the final cost.

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Code P203C Information for Specific Makes

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.

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