AutoCodes – Buick – P248C Buick

P248C Buick Code - Reductant Heater 2 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: P248C Buick indicates Reductant Heater 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 269

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P248C 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 line heater voltage.

OBDII Code P248C Buick - Reductant Heater 2 Feedback Circuit Low Voltage - AutoCodes.com — P248C Buick Code - Reductant Heater 2 Feedback Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P248C 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 P248C 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 P248C 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 P248C Buick code?

Need more information on how to fix the P248C Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P248C Buick code diagnosed by a professional: Find a repair shop in your area

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 P248C Buick Code

1. What are common symptoms of OBDII code P248C in a Buick relating to Reductant Heater 2 Feedback Circuit Low Voltage?

- Common symptoms include the check engine light being illuminated, reduced engine performance, and potential issues with the vehicle's emissions system.

2. What are some possible causes of OBDII code P248C in a Buick related to Reductant Heater 2 Feedback Circuit Low Voltage?

- Possible causes may include a faulty reductant heater, damaged wiring or connectors in the heater circuit, a defective reductant heater control module, or a malfunctioning powertrain control module.

3. How can I diagnose the cause of OBDII code P248C in my Buick?

- Diagnosing the cause of this code typically involves using a diagnostic scanner to read the code, inspecting the reductant heater circuit for any visible damage, and testing the components involved in the circuit for proper operation.

4. What are some repair tips for addressing OBDII code P248C in a Buick?

- Repair tips may include checking and repairing any damaged wiring or connectors in the heater circuit, replacing a faulty reductant heater, testing and, if necessary, replacing the reductant heater control module, or reprogramming the powertrain control module.

5. Can I continue driving my Buick with OBDII code P248C present?

- It is not recommended to continue driving your Buick with this code present, as it may lead to further damage to the emissions system and potentially affect the vehicle's performance.

6. Will resetting the check engine light resolve OBDII code P248C in a Buick?

- Resetting the check engine light may temporarily turn off the light, but it will not resolve the underlying issue causing the code to trigger. It is important to diagnose and repair the root cause of the code.

7. How much does it typically cost to repair OBDII code P248C in a Buick?

- The cost of repairing this code can vary depending on the specific cause and the labor rates in your area. Repairs may range from a few hundred dollars to over a thousand dollars, depending on the extent of the issue.

8. Is OBDII code P248C in a Buick covered under any warranties?

- Depending on the age and mileage of your Buick, this code may be covered under the manufacturer's emissions warranty. It is recommended to check your warranty information or consult with a dealership for more details.

9. Can a DIY enthusiast repair OBDII code P248C in a Buick?

- While some aspects of diagnosing and repairing this code may be possible for a DIY enthusiast with the right tools and knowledge, it is recommended to consult a professional mechanic for proper diagnosis and repair to ensure the issue is resolved correctly.

10. How often does OBDII code P248C occur in Buick vehicles?

- OBDII code P248C related to Reductant Heater 2 Feedback Circuit Low Voltage is relatively uncommon in Buick vehicles, but it can occur due to various factors affecting the emissions system and reductant heater components.