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Engine-Codes – Generic – P203E

P203E Code - Reductant Level Sensor Circuit Intermittent/Erratic

Quick Answer

The P203E diagnostic trouble code refers to a Reductant Level Sensor Circuit Intermittent/Erratic issue. Common causes include Faulty reductant level sensor, Wiring issues or a poor electrical connection, Corrosion or damage to the sensor or its wiring. 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
P203E indicates Reductant Level Sensor Circuit Intermittent/Erratic.
Common causes
Common causes include Faulty reductant level sensor, Wiring issues or a poor electrical connection, Corrosion or damage to the sensor or its wiring.
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 Aug 19, 2024
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Code P203E Description

The P203E diagnostic trouble code refers to a Reductant Level Sensor Circuit Intermittent/Erratic issue. This code indicates a problem with the reductant level sensor, which is a crucial component of the vehicle's emissions system. The reductant level sensor is responsible for monitoring the level of diesel exhaust fluid (DEF) in the reductant tank. DEF is used in vehicles equipped with selective catalytic reduction (SCR) systems to reduce harmful emissions. When the reductant level sensor circuit is intermittent or erratic, it can lead to inaccurate readings of DEF levels, potentially causing the vehicle to emit higher levels of pollutants.

OBDII Code P203E - Reductant Level Sensor Circuit Intermittent/Erratic
P203E Code - Reductant Level Sensor Circuit Intermittent/Erratic

Common Causes of P203E

  1. Faulty reductant level sensor.
  2. Wiring issues or a poor electrical connection.
  3. Corrosion or damage to the sensor or its wiring.
  4. DEF contamination.
  5. Software or calibration issues.

Symptoms of P203E

  1. Check engine light illuminated on the dashboard.
  2. Reduced engine performance or power.
  3. Poor fuel efficiency.
  4. Failed emissions test.
  5. The vehicle may go into a reduced power or limp mode.

How to Fix P203E

  1. Begin by conducting a visual inspection of the reductant level sensor and its wiring for any signs of damage or corrosion.
  2. Check the electrical connections and ensure they are secure and free of debris.
  3. Test the reductant level sensor using a multimeter to determine if it is functioning correctly.
  4. If the sensor is faulty, replace it with a new one following the manufacturer's guidelines.
  5. Clear the diagnostic trouble codes and reset the system to see if the issue has been resolved.

Cost to Fix P203E

The cost of repairing a P203E code can vary depending on the specific cause of the issue and the vehicle's make and model. Generally, replacing a reductant level sensor can cost between $150 to $300 for the part, with additional labor costs ranging from $100 to $200. Overall, the total repair cost could range from $250 to $500. It's essential to consider the specific diagnosis time and labor rates at auto repair shops in your area to get a more accurate estimate.

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Code P203E 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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