AutoCodes – GMC – P203D GMC

P203D GMC Code - Reductant Level Sensor Circuit High Voltage

Quick Answer

The reductant level sensor provides discrete information about the diesel exhaust fluid quantity present in the Reductant tank. Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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: P203D GMC indicates Reductant Level Sensor Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Pump and Sensor Assembly, Reductant Pump and Sensor Assembly harness is open or shorted, Reductant Pump and Sensor Assembly 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 884

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 Jul 26, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P203D GMC Description

The reductant level sensor provides discrete information about the diesel exhaust fluid quantity present in the Reductant tank. The sensor signal provides information to the Reductant Control Module to determine 4 different states: FULL, OK, WARNING1, and WARNING2. The Reductant Control Module diagnoses the sensor for open circuit, short to ground, and short to voltage electrical faults. The sensor is also checked for invalid range output by determining if the float is mechanically stuck in a plausible position. The Diagnostic Trouble Code (DTC) will be set when the reductant level sensor signal is greater than a calibrated threshold for greater than 5 s.

OBDII Code P203D GMC - Reductant Level Sensor Circuit High Voltage - AutoCodes.com — P203D GMC Code - Reductant Level Sensor Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P203D GMC?

Faulty Reductant Pump and Sensor Assembly
Reductant Pump and Sensor Assembly harness is open or shorted
Reductant Pump and Sensor Assembly circuit poor electrical connection
Faulty Reductant Control Module

How to Fix the DTC P203D GMC?

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 P203D GMC 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 P203D GMC code?

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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 P203D GMC Code

1. What are the common symptoms of OBDII code P203D GMC (Reductant Level Sensor Circuit High Voltage)?

- Common symptoms include the check engine light illuminating, poor fuel economy, and potential issues with the vehicle's exhaust system.

2. What can cause the OBDII code P203D GMC to trigger?

- The code can be triggered by a faulty reductant level sensor, wiring issues, or problems with the vehicle's DEF (diesel exhaust fluid) system.

3. How can I diagnose the cause of the P203D code?

- Diagnosing the issue typically involves performing a thorough inspection of the reductant level sensor, checking the wiring for any damage or corrosion, and ensuring the DEF system is functioning properly.

4. What are some repair tips for fixing the Reductant Level Sensor Circuit High Voltage issue?

- Repair tips may include replacing the reductant level sensor, repairing any damaged wiring, or addressing any DEF system malfunctions identified during diagnosis.

5. Can I continue driving my vehicle with the P203D trouble code?

- It is not recommended to continue driving the vehicle with the P203D trouble code, as it can potentially lead to more severe issues with the vehicle's emissions system.

6. How much does it typically cost to repair the Reductant Level Sensor Circuit High Voltage problem?

- The cost of repairing this issue can vary depending on the underlying cause, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Will resetting the trouble codes make the P203D code go away?

- Resetting the trouble codes may temporarily clear the check engine light, but if the underlying issue causing the P203D code is not addressed, the code is likely to reappear.

8. Are there any recalls or technical service bulletins related to the P203D code in GMC vehicles?

- It's recommended to check with a GMC dealership or the manufacturer's website to see if there are any recalls or technical service bulletins related to the P203D trouble code for your specific vehicle model.

9. Can a DIY enthusiast repair the Reductant Level Sensor Circuit High Voltage issue?

- While some DIY enthusiasts may be able to diagnose and repair the issue themselves, dealing with the vehicle's emissions system and reductant level sensor may require specialized tools and expertise, so it's recommended to consult a professional mechanic for proper diagnosis and repair.

10. How important is it to address the P203D trouble code promptly?

- It is essential to address the P203D trouble code promptly to prevent potential damage to the vehicle's emissions system, ensure optimal fuel efficiency, and maintain overall vehicle performance.