AutoCodes – Cadillac – P248A Cadillac

P248A Cadillac 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 Cadillac 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 262

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

What does this mean?

What are the Possible Causes of the DTC P248A Cadillac?

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 Cadillac?

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 Cadillac 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 P248A Cadillac Code

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

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

2. What are some possible causes of OBDII code P248A in a Cadillac?

- Possible causes may include a faulty reductant heater, damaged wiring or connectors in the heater circuit, a malfunctioning reductant heater control module, or issues with the powertrain control module (PCM).

3. How can I diagnose the issue causing OBDII code P248A in my Cadillac?

- Diagnosis typically involves using an OBDII scanner to retrieve the specific fault code, inspecting the reductant heater system components for damage or corrosion, and testing the electrical connections for proper voltage and continuity.

4. Is it safe to continue driving my Cadillac with OBDII code P248A present?

- It is not recommended to continue driving the vehicle with this fault code present, as it can lead to potential emissions system issues and decreased engine performance.

5. How can I repair OBDII code P248A in my Cadillac?

- Repair options may include replacing the faulty reductant heater, repairing damaged wiring or connectors, resetting the fault code with a diagnostic tool, or seeking professional assistance for further diagnosis and repair.

6. Can I reset the OBDII code P248A in my Cadillac myself?

- While you can attempt to reset the code using an OBDII scanner, it is crucial to address the underlying issue causing the fault code to prevent it from reoccurring.

7. Will OBDII code P248A cause my Cadillac to fail emissions testing?

- Yes, having this fault code present can potentially lead to emissions testing failure due to issues with the vehicle's emissions control system.

8. How long does it typically take to repair OBDII code P248A in a Cadillac?

- The repair time can vary depending on the specific cause of the fault code, but it may take anywhere from a few hours to a full day to diagnose and fix the issue.

9. Is OBDII code P248A a common issue in Cadillac vehicles?

- While it may not be extremely common, this fault code can occur in Cadillac vehicles equipped with a reductant heater system, especially in models that are several years old.

10. Can I prevent OBDII code P248A from occurring in my Cadillac?

- Regular maintenance and inspections of the vehicle's emissions system, including the reductant heater components, can help prevent issues that may trigger this fault code.