AutoCodes – Buick – P248A Buick

P248A Buick Code - Reductant Heater 1 Feedback Circuit Low 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: P248A Buick indicates Reductant Heater 1 Feedback Circuit Low 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 309

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 P248A 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 a 3 V difference between battery voltage and reductant tank heater voltage.

OBDII Code P248A Buick - Reductant Heater 1 Feedback Circuit Low Voltage - AutoCodes.com — P248A Buick Code - Reductant Heater 1 Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P248A 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 P248A 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 P248A 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.

Need more information about the P248A Buick code?

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Need Help with the 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 P248A Buick Code

1. What are the common symptoms of OBDII code P248A in a Buick related to the Reductant Heater 1 Feedback Circuit Low Voltage?

- Common symptoms include the check engine light illuminating, reduced engine performance, and possibly a decrease in fuel efficiency.

2. What are some potential causes of the P248A code in a Buick?

- Possible causes may include a faulty reductant heater 1, damaged wiring or connectors in the feedback circuit, or a problem with the powertrain control module.

3. How serious is the P248A OBDII code in a Buick?

- While the severity may vary, it is recommended to address this code promptly to prevent potential damage to the emission control system and ensure optimal vehicle performance.

4. Can I continue driving my Buick with the P248A code present?

- It is generally not recommended to continue driving with the code active, as it can lead to increased emissions and potential issues with passing emissions tests.

5. How can I diagnose the Reductant Heater 1 Feedback Circuit Low Voltage issue in my Buick?

- Diagnosis typically involves using a diagnostic scanner to read the code, testing the reductant heater 1, inspecting related wiring and connectors, and checking for any other potential issues.

6. What are some repair tips for addressing the P248A code in a Buick?

- Repair tips may include replacing the faulty reductant heater 1, repairing any damaged wiring or connectors, or resetting the powertrain control module after addressing the issue.

7. Is it possible to reset the P248A code in a Buick without fixing the underlying problem?

- While you can clear the code temporarily, it is crucial to address the root cause to prevent the issue from reoccurring and potentially causing more significant problems.

8. Can a DIY enthusiast fix the P248A code issue in a Buick?

- Depending on your skills and experience, some DIY enthusiasts may be able to address this issue by following repair guides and using the necessary tools and equipment.

9. How much does it typically cost to repair the Reductant Heater 1 Feedback Circuit Low Voltage issue in a Buick?

- The cost of repairs can vary based on the specific cause of the issue, but it may involve expenses for parts, labor, and potentially diagnostic services.

10. Will fixing the P248A code improve the overall performance and fuel efficiency of my Buick?

- Addressing the code and resolving the underlying issue can help restore optimal vehicle performance and fuel efficiency, ensuring your Buick runs smoothly.