AutoCodes – Chevrolet – P203B Chevrolet

P203B Chevrolet Code - Reductant Level Sensor Performance

Quick Answer

The reductant level/temperature sensor is a solid-state device that provides the Engine Control Module (ECM) with information on reductant level and temperature. 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: P203B Chevrolet indicates Reductant Level Sensor Performance.
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 969

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 Sep 10, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P203B Chevrolet Description

The reductant level/temperature sensor is a solid-state device that provides the Engine Control Module (ECM) with information on reductant level and temperature. The level/temperature sensor receives system voltage directly from the underhood electrical center and ground through a chassis ground circuit. The level sensor consists of three sensing elements. Reductant level sensor 3 is highest, reductant level sensor 2 is located between sensor 1 and 3. Reductant level sensor 1 is located at low reductant level. Reductant level sensor 3 is located at less than half range of the DEF tank level. The scan tool will display Active when the level sensors are in contact with the reductant and Inactive when not in contact with the reductant. An integrated temperature sensor monitors reductant temperature. Reductant level and temperature signals are processed within the sensor and supplied to the ECM as serial data messages. The ECM will set a DTC when it detects an invalid level or temperature serial data message from the sensor. The Diagnostic Trouble Code (DTC) will be set when the ECM receives a serial data message from the reductant sensor module that the reductant level sensor indications are not plausible.

OBDII Code P203B Chevrolet - Reductant Level Sensor Performance - AutoCodes.com — P203B Chevrolet Code - Reductant Level Sensor Performance

What does this mean?

What are the Possible Causes of the DTC P203B Chevrolet?

Faulty Reductant Level Sensor
Reductant Level Sensor harness is open or shorted
Reductant Level Sensor circuit poor electrical connection

How to Fix the DTC P203B Chevrolet?

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 P203B Chevrolet 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 P203B Chevrolet Code

1. What are the common symptoms of OBDII code P203B in a Chevrolet related to the Reductant Level Sensor Performance?

- Common symptoms include the illumination of the Check Engine Light, decreased fuel efficiency, and potential issues with the vehicle's emission system.

2. What are the possible causes of OBDII code P203B in a Chevrolet associated with the Reductant Level Sensor Performance?

- The code P203B can be triggered by issues such as a faulty reductant level sensor, wiring problems, a malfunctioning control module, or low-quality diesel exhaust fluid (DEF).

3. How can I diagnose OBDII code P203B in a Chevrolet regarding the Reductant Level Sensor Performance?

- Diagnosing the code typically involves using an OBDII scanner to read the code, inspecting the reductant level sensor and its wiring for any damage, and checking the DEF quality and level.

4. What are some DIY repair tips for addressing OBDII code P203B in a Chevrolet due to Reductant Level Sensor Performance issues?

- DIY repair tips may include checking and replacing the reductant level sensor if faulty, repairing any damaged wiring, ensuring proper DEF quality and levels, and resetting the code with an OBDII scanner.

5. Is it safe to continue driving my Chevrolet with OBDII code P203B related to Reductant Level Sensor Performance?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential damage to the emission system and ensure optimal vehicle performance.

6. Can resetting the OBDII code P203B in a Chevrolet fix the issue related to Reductant Level Sensor Performance?

- Resetting the code may temporarily turn off the Check Engine Light, but if the underlying issue causing the code is not resolved, the light is likely to come back on.

7. How much does it typically cost to repair OBDII code P203B in a Chevrolet related to Reductant Level Sensor Performance?

- The cost of repair can vary depending on the specific cause of the issue, but it may range from $100 to $500, including parts and labor.

8. Are there any recalls or technical service bulletins related to OBDII code P203B in Chevrolet vehicles concerning Reductant Level Sensor Performance?

- It is advisable to check with Chevrolet dealerships or online resources for any recalls or technical service bulletins specific to OBDII code P203B and the Reductant Level Sensor Performance issue in Chevrolet vehicles.

9. Can extreme weather conditions affect the performance of the Reductant Level Sensor in a Chevrolet and trigger OBDII code P203B?

- Yes, extreme temperatures or environmental conditions can potentially impact the performance of the Reductant Level Sensor and contribute to triggering code P203B in a Chevrolet.

10. How often should the Reductant Level Sensor be inspected and maintained to prevent OBDII code P203B in a Chevrolet?

- It is recommended to include the inspection of the Reductant Level Sensor as part of regular vehicle maintenance, such as during scheduled service intervals or whenever the Check Engine Light illuminates.