Engine-Codes.com
Engine-Codes – Generic – P248D

P248D Code - Reductant Heater 2 Feedback Circuit High Voltage

Quick Answer

The P248D diagnostic trouble code (DTC) refers to the Reductant Heater 2 Feedback Circuit High Voltage. Common causes include Faulty Reductant Heater: The most common cause of the P248D code is a malfunctioning reductant heater itself, which can lead to high voltage feedback to the ECM, Wiring Issues: Damage or corrosion in the wiring harness connected to the reductant heater can disrupt the feedback circuit and trigger the code, ECM Malfunction: A malfunction in the engine control module responsible for monitoring the reductant heater feedback circuit can also cause this code. 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
P248D indicates Reductant Heater 2 Feedback Circuit High Voltage.
Common causes
Common causes include Faulty Reductant Heater: The most common cause of the P248D code is a malfunctioning reductant heater itself, which can lead to high voltage feedback to the ECM, Wiring Issues: Damage or corrosion in the wiring harness connected to the reductant heater can disrupt the feedback circuit and trigger the code, ECM Malfunction: A malfunction in the engine control module responsible for monitoring the reductant heater feedback circuit can also cause this code.
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 08, 2024
💬 Need more help? Ask Auto Expert for instant answers — it's free!
AutoCodes App

Fix Your Car Smarter

Try the New AutoCodes App!

Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.

AutoCodes App on Google Play

Code P248D Description

The P248D diagnostic trouble code (DTC) refers to the Reductant Heater 2 Feedback Circuit High Voltage. This code indicates that there is a problem with the circuit responsible for controlling the reductant heater in the vehicle's emissions control system. The reductant heater is a component that helps in the proper operation of the Selective Catalytic Reduction (SCR) system, which is designed to reduce harmful emissions, particularly nitrogen oxides (NOx), in the exhaust gases of diesel engines.

OBDII Code P248D - Reductant Heater 2 Feedback Circuit High Voltage
P248D Code - Reductant Heater 2 Feedback Circuit High Voltage

Common Causes of P248D

  1. Faulty Reductant Heater: The most common cause of the P248D code is a malfunctioning reductant heater itself, which can lead to high voltage feedback to the ECM.
  2. Wiring Issues: Damage or corrosion in the wiring harness connected to the reductant heater can disrupt the feedback circuit and trigger the code.
  3. ECM Malfunction: A malfunction in the engine control module responsible for monitoring the reductant heater feedback circuit can also cause this code.
  4. Poor Electrical Connection: Loose or poor electrical connections between the reductant heater and the ECM can lead to high voltage readings and trigger the code.
  5. Software Update: In some cases, the issue may be resolved by updating the ECM software to address any known glitches or bugs related to the reductant heater feedback circuit.

Symptoms of P248D

  1. Check Engine Light: The most common symptom associated with the P248D code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning reductant heater can lead to decreased fuel efficiency as the emissions control system may not be operating optimally.
  3. Failed Emissions Test: If the SCR system is not functioning correctly due to the high voltage feedback circuit issue, the vehicle may fail emissions tests.
  4. Rough Engine Performance: In some cases, drivers may notice rough engine performance or hesitation when accelerating, which can be a result of the SCR system not working efficiently.

How to Fix P248D

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the DTC codes and pinpoint the exact cause of the high voltage feedback circuit issue.
  2. Inspect Wiring and Connections: Thoroughly inspect the wiring harness and connections related to the reductant heater to check for any damage or corrosion.
  3. Test Reductant Heater: Test the reductant heater itself to ensure it is functioning correctly and replace it if necessary.
  4. Repair or Replace Wiring: Repair any damaged wiring or connectors, or replace the wiring harness if needed.
  5. Clear DTC Codes: After completing the repairs, clear the DTC codes and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P248D

The cost of repairing the P248D code can vary depending on the exact cause of the issue and the labor rates in your area. Typically, the parts required for this repair, such as a new reductant heater or wiring harness, can range from $200 to $500. Labor costs at an auto repair shop can add another $100 to $300 to the total bill. Therefore, the total repair cost for this issue may fall in the range of $300 to $800. Keep in mind that these are rough estimates and actual costs may vary based on the specific circumstances of your vehicle and location. It's advisable to consult with a qualified mechanic or repair shop to get a more accurate cost estimate for fixing the P248D code.

Need more information about the P248D code?

Need more information on how to fix the P248D code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P248D code diagnosed by a professional: Find a repair shop in your area

Code P248D 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.

Frequently Asked Questions about P248D Code

1. What are the common symptoms of OBDII code P248D (Reductant Heater 2 Feedback Circuit High Voltage)?

The common symptoms of code P248D include the check engine light illuminating on the dashboard, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What are the possible causes of OBDII code P248D?

Possible causes of code P248D can include a faulty reductant heater 2, damaged wiring or connectors in the heater circuit, a defective powertrain control module (PCM), or a software issue within the PCM.

3. How can I diagnose OBDII code P248D?

Diagnosing code P248D involves using an OBDII scanner to read the code and identify the specific issue. Further diagnostic steps may include testing the reductant heater 2, inspecting related wiring and connectors, and checking for any other potential faults in the system.

4. Can I continue driving with OBDII code P248D present?

It is not recommended to continue driving with code P248D present, as it can lead to further damage to the vehicle's emissions system and potentially affect engine performance. It is best to address the issue promptly to avoid more serious problems.

5. How can I repair OBDII code P248D?

Repairing code P248D may involve replacing the reductant heater 2, repairing or replacing damaged wiring or connectors, resetting the PCM, or updating the software in the PCM. It is advisable to consult a professional mechanic for the most accurate diagnosis and repair.

6. Is OBDII code P248D related to emissions compliance?

Yes, code P248D is related to the vehicle's emissions system, specifically the reductant heater circuit. Addressing this code is important for maintaining emissions compliance and ensuring the vehicle runs efficiently.

7. Can weather conditions affect OBDII code P248D?

Extreme weather conditions, such as very low temperatures, can potentially impact the operation of the reductant heater and trigger code P248D. It's important to consider environmental factors when diagnosing and repairing this code.

8. How long does it typically take to repair OBDII code P248D?

The repair time for code P248D can vary depending on the specific cause of the issue and the complexity of the repair. In some cases, it may be a relatively quick fix, while in others, it may require more extensive troubleshooting and part replacement.

9. Can I reset the check engine light after repairing OBDII code P248D?

Once the underlying issue causing code P248D has been repaired, the check engine light can be reset using an OBDII scanner. This will clear the code from the vehicle's system and turn off the warning light on the dashboard.

10. Are there any preventive maintenance tips to avoid OBDII code P248D in the future?

To help prevent code P248D from occurring in the future, it is recommended to follow the manufacturer's recommended maintenance schedule, including regular inspections of the emissions system components and addressing any issues promptly to avoid more serious problems.

Discuss the causes and fixes for P248D OBDII Code

Submit a New Comment

Code P248D comments

No comments found for this page.