AutoCodes – Generic – P248C

P248C 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 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.

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Code Popularity 1,725

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

What does this mean?

What are the Possible Causes of the DTC P248C?

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?

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 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 code?

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

Need Help with the Code?

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

Information for Specific Makes

P248C Buick — Reductant Heater 2 Feedback Circuit Low Voltage
P248C Cadillac — Reductant Heater 2 Feedback Circuit Low Voltage
P248C Chevrolet — Reductant Heater 2 Feedback Circuit Low Voltage
P248C GMC — Reductant Heater 2 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 P248C Code

1. What are the common symptoms of OBDII code P248C (Reductant Heater 2 Feedback Circuit Low Voltage)?

The common symptoms of code P248C include the malfunction indicator light (MIL) illuminating on the dashboard, reduced engine performance, and potential issues with the exhaust system.

2. What are the possible causes of OBDII code P248C?

Possible causes of code P248C include a faulty reductant heater 2, damaged wiring or connectors in the reductant heater circuit, a defective powertrain control module (PCM), or issues with the reductant heater control module.

3. How can I diagnose OBDII code P248C?

Diagnosing code P248C involves using an OBDII scanner to retrieve the code, inspecting the reductant heater 2 and its circuit for any visible damage, and conducting electrical tests to check for proper voltage and continuity.

4. Can I continue driving with OBDII code P248C?

It is not recommended to drive with code P248C present, as it can lead to reduced engine performance and potential damage to the exhaust system. It is best to address the issue promptly to avoid further complications.

5. How can I repair OBDII code P248C?

Repairing code P248C may involve replacing the faulty reductant heater 2, repairing or replacing damaged wiring or connectors, resetting the fault codes with a scanner, and ensuring proper operation of the reductant heater system.

6. Is it possible to prevent OBDII code P248C from occurring?

While some instances of code P248C may be unavoidable due to component failures, regular maintenance and inspections of the reductant heater system can help prevent issues that may trigger this fault code.

7. Can a DIY enthusiast fix OBDII code P248C?

Depending on the individual's skill level and access to tools, some DIY enthusiasts may be able to address code P248C by following repair guides, but it is recommended to consult a professional mechanic for accurate diagnosis and repair.

8. Are there any recalls related to OBDII code P248C?

Recalls related to code P248C can vary depending on the vehicle make and model. It is advisable to check with the manufacturer or a dealership to inquire about any recalls associated with this specific fault code.

9. How much does it typically cost to repair OBDII code P248C?

The cost of repairing code P248C can vary depending on the extent of the issue, the necessary repairs or replacements, labor costs, and the specific vehicle. It is recommended to obtain quotes from different mechanics to compare prices.

10. Can OBDII code P248C be intermittent?

Yes, code P248C can sometimes be intermittent, meaning it may come and go sporadically. In such cases, it is crucial to address the underlying issue even if the MIL light turns off temporarily to prevent potential long-term damage.