P203B Code - Reductant Level Sensor Circuit Range/Performance
Quick Answer
The task of the discrete level sensor is to measure the tank level at 3 different heights. 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 indicates Reductant Level Sensor Circuit Range/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.
Code P203B Description
The level sensor consists of four high-grade stainless steel pins. The length of each pin defines the tank level (height) which is to be checked. Only three pins can be used for level evaluation. The fourth pin is used as ground pin. Due to the electrical conductivity of Urea the level sensor will determine whether the tank level is above or below the respective level sensor position. This information will be directly evaluated by the ECU.
What are the Possible Causes of the DTC P203B?
- 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?
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 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.
Need more information about the P203B code?
Need more information on how to fix the P203B code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P203B code diagnosed by a professional: Find a repair shop in your area
Information for Specific Makes
- P203B Audi — Reductant Level Sensor Circuit Range/Performance
- P203B BMW — Reductant Level Sensor Circuit Range/Performance
- P203B Chevrolet — Reductant Level Sensor Performance
- P203B Dodge — Reductant Level Sensor Circuit Range/Performance
- P203B Ford — Reductant Level Sensor Circuit Range/Performance
- P203B GMC — Reductant Level Sensor Performance
- P203B RAM — Reductant Level Sensor Circuit Range/Performance
- P203B Volkswagen — Reductant Level Sensor Circuit Range/Performance
Frequently Asked Questions about P203B Code
No Frequently Asked Questions about P203B Code found.
Discuss the causes and fixes for P203B OBDII Code
Code P203B comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
