P248B GMC Code - Reductant Heater 1 Feedback Circuit High 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
- P248B GMC indicates Reductant Heater 1 Feedback Circuit High 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.
Code P248B GMC Description
What are the Possible Causes of the DTC P248B GMC?
- 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 P248B GMC?
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 P248B GMC 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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Frequently Asked Questions about P248B GMC Code
1. What are the common symptoms of OBDII code P248B GMC?
The common symptoms of code P248B GMC include the check engine light illuminating on the dashboard, reduced engine performance, and potential issues with the vehicle's emissions system.
2. What does the OBDII code P248B GMC "Reductant Heater 1 Feedback Circuit High Voltage" mean?
This code indicates that there is a high voltage condition detected in the feedback circuit of Reductant Heater 1 in the vehicle's emissions system.
3. What are the possible causes of OBDII code P248B GMC?
Possible causes of code P248B GMC include a faulty reductant heater, damaged wiring or connectors in the heater circuit, a defective temperature sensor, or issues with the powertrain control module (PCM).
4. How can I diagnose OBDII code P248B GMC?
Diagnosing code P248B GMC typically involves using a scan tool to retrieve the code and then conducting a visual inspection of the reductant heater system, checking the wiring and connectors for damage, and testing the components for proper function.
5. Can I continue driving with OBDII code P248B GMC active?
It is not recommended to continue driving with code P248B GMC active, as it can lead to reduced fuel efficiency, potential damage to the emissions system, and may cause the vehicle to fail an emissions test.
6. How can I repair OBDII code P248B GMC?
Repairing code P248B GMC may involve replacing the faulty reductant heater, repairing or replacing damaged wiring or connectors, replacing the temperature sensor, or reprogramming the PCM if necessary.
7. Will resetting the check engine light clear OBDII code P248B GMC?
Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to return. It is important to diagnose and repair the root cause of the problem.
8. Is OBDII code P248B GMC a serious issue?
While code P248B GMC is not typically considered a severe issue that poses an immediate danger, it should be addressed promptly to prevent potential damage to the emissions system and ensure optimal vehicle performance.
9. Can a DIY enthusiast fix OBDII code P248B GMC?
Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P248B GMC. However, it is recommended to consult a professional mechanic for accurate diagnosis and proper repair.
10. How much does it cost to fix OBDII code P248B GMC at a repair shop?
The cost of fixing code P248B GMC at a repair shop can vary depending on the specific cause of the issue, the labor rates in your area, and the cost of parts needed for the repair. It is best to get a diagnostic from a mechanic for an accurate estimate.
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