AutoCodes – Generic – P248A

P248A 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 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 1,848

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

What does this mean?

What are the Possible Causes of the DTC P248A?

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?

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 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 code?

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Need Help with the Code?

Get the P248A code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P248A Buick — Reductant Heater 1 Feedback Circuit Low Voltage
P248A Cadillac — Reductant Heater 1 Feedback Circuit Low Voltage
P248A Chevrolet — Reductant Heater 1 Feedback Circuit Low Voltage
P248A GMC — Reductant Heater 1 Feedback Circuit Low Voltage

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 Code

1. What are the common symptoms of OBDII code P248A (Reductant Heater 1 Feedback Circuit Low Voltage)?

- Common symptoms include the illumination of the Check Engine Light, reduced engine performance, and potential failure to pass emissions tests.

2. What are the possible causes of OBDII code P248A?

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

3. How serious is OBDII code P248A?

- While this code may not cause immediate harm to the vehicle, it can lead to increased emissions and reduced fuel efficiency if left unrepaired.

4. How can I diagnose OBDII code P248A?

- Diagnosing this code typically involves using a scan tool to read the code, checking the wiring and connectors related to the reductant heater, and testing the reductant heater and control module for proper functioning.

5. Can I drive my vehicle with OBDII code P248A?

- It is generally not recommended to drive the vehicle with this code present, as it can lead to increased emissions and potential engine performance issues.

6. How can I repair OBDII code P248A?

- Repairing this code often involves replacing the faulty reductant heater, repairing or replacing damaged wiring or connectors, or replacing the reductant heater control module.

7. Can I reset OBDII code P248A without fixing the underlying issue?

- While you can clear the code using a scan tool, it is important to address the root cause of the issue to prevent the code from reappearing.

8. How much does it cost to repair OBDII code P248A?

- The cost of repairing this code can vary depending on the specific issue, but it may range from $200 to $600, including parts and labor.

9. Can a DIY enthusiast fix OBDII code P248A?

- Depending on your skill level and access to tools, some DIY enthusiasts may be able to repair this code by replacing the reductant heater or checking and repairing wiring issues.

10. How long does it take to repair OBDII code P248A?

- The repair time for this code can vary depending on the extent of the issue and the availability of parts, but it typically takes a few hours to complete the repair.