AutoCodes – Buick – P248D Buick

P248D Buick Code - Reductant Heater 2 Feedback Circuit High Voltage

Quick Answer

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. Common causes include Faulty Reductant Line Heater, Reductant Line Heater harness is open or shorted, Reductant Line Heater 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: P248D Buick indicates Reductant Heater 2 Feedback Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Line Heater, Reductant Line Heater harness is open or shorted, Reductant Line Heater 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 275

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 29, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P248D Buick Description

As reductant will freeze at temperatures below -11°C (12°F), there are 2 reductant heaters located in the reductant tank. One heats the reductant in the tank, and one heats the reductant supplied to the reductant injector supply pipe. The Engine Control Module (ECM) monitors the reductant temperature in the tank in order to determine if the reductant temperature is below its freeze point. If the ECM determines that the reductant may be frozen, it activates a defrost strategy energizing the reductant heater. This energizing action terminates when the temperature sensor measures a threshold value over which the heater must be deactivated. The Diagnostic Trouble Code (DTC) will be set when there is greater than 3 V difference between battery voltage and reductant line heater voltage.

OBDII Code P248D Buick - Reductant Heater 2 Feedback Circuit High Voltage - AutoCodes.com — P248D Buick Code - Reductant Heater 2 Feedback Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P248D Buick?

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

How to Fix the DTC P248D Buick?

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 P248D Buick 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 P248D Buick Code

1. What does the OBDII code P248D for Buick indicate?

The code P248D specifically refers to a high voltage condition in the Reductant Heater 2 feedback circuit of the vehicle.

2. What are the common symptoms associated with OBDII code P248D in a Buick?

Common symptoms may include the Check Engine light illuminating on the dashboard, reduced engine performance, and potentially poor fuel efficiency.

3. What are the possible causes of the P248D code in a Buick?

The P248D code can be triggered by issues such as a faulty Reductant Heater 2, damaged wiring or connectors in the circuit, or a failed temperature sensor.

4. How can I diagnose the P248D code in my Buick?

Diagnosing the P248D code typically involves using an OBDII scanner to retrieve the code, inspecting the Reductant Heater 2 system for any visible damage, and testing the circuit for proper voltage levels.

5. Is it safe to continue driving my Buick with the P248D code present?

While the vehicle may still be operable with the P248D code, it is recommended to address the issue promptly to prevent any potential damage to the emissions control system.

6. Can I repair the P248D code in my Buick myself?

Depending on your automotive knowledge and skills, you may be able to address the P248D code yourself by replacing the Reductant Heater 2, repairing any damaged wiring, or replacing the temperature sensor.

7. Should I reset the OBDII code P248D after making repairs to my Buick?

Yes, it is advisable to reset the code using an OBDII scanner after addressing the underlying issue. This will clear the Check Engine light and allow you to monitor if the problem reoccurs.

8. What are some tips for preventing the OBDII code P248D in a Buick?

Regularly maintaining your vehicle, including checking the emission control system, ensuring proper wiring connections, and using high-quality diesel exhaust fluid, can help prevent the P248D code from appearing.

9. Is the OBDII code P248D specific to Buick vehicles or can it occur in other car brands?

The P248D code related to the Reductant Heater 2 feedback circuit can be found in various vehicles equipped with similar emissions control systems, not just limited to Buick models.

10. If the P248D code persists after repair, what should I do next?

If the P248D code persists even after repair attempts, it is recommended to seek assistance from a qualified mechanic or dealership to conduct a more in-depth diagnostic and inspection of the system.