P249E GMC Code - Closed Loop Reductant Injection Control At Limit – Flow Too High
Quick Answer
The selective catalytic reduction system reduces oxides of nitrogen (NOx) emissions by injecting a metered amount of diesel exhaust fluid or reductant into the exhaust gas stream entering the Diesel Particulate Filter (DPF). Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF). 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
- P249E GMC indicates Closed Loop Reductant Injection Control At Limit – Flow Too High.
- Common causes
- Common causes include Exhaust Leaks, Fuel contamination, Faulty Diesel Particulate Filter (DPF).
- 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 P249E GMC Description
The ECM uses the 2 NOx sensors to control exhaust NOx levels. The NOx sensor measures the amount of NOx and oxygen in the exhaust system. The first NOx sensor is located at the outlet of the turbocharger and monitors the engine out NOx. The second NOx sensor is located in the DPF that monitors NOx levels exiting the DPF. The ECM varies the amount of reductant added by varying the reductant injector duty cycle in response to changes in engine exhaust out NOx levels.
What are the Possible Causes of the DTC P249E GMC?
- Exhaust Leaks
- Fuel contamination
- Faulty Diesel Particulate Filter (DPF)
- Faulty NOx Sensor
- Diesel Exhaust Fluid
- Faulty Selective Catalyst Reduction (SCR) Catalyst
How to Fix the DTC P249E 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 P249E 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 P249E GMC Code
1. What are the common symptoms of OBDII code P249E GMC?
The common symptoms include the Check Engine Light (CEL) being illuminated, decreased fuel efficiency, and potential exhaust system-related issues.
2. What can cause the OBDII code P249E GMC to trigger?
This code is typically triggered by issues such as a faulty reductant injector, a clogged reductant system, or a malfunctioning reductant pump.
3. How serious is the OBDII code P249E GMC?
While this code may not cause immediate harm to the vehicle, ignoring it can lead to decreased fuel efficiency and potential damage to the exhaust system over time.
4. How can I diagnose the OBDII code P249E GMC?
Diagnosing this code usually involves using a scan tool to retrieve the code, inspecting the reductant system components for any damage or blockages, and testing the reductant injector and pump.
5. What are some repair tips for fixing OBDII code P249E GMC?
Repair tips may include cleaning or replacing the reductant injector, checking and clearing any blockages in the reductant system, and ensuring proper functioning of the reductant pump.
6. Can I drive my vehicle with the OBDII code P249E GMC?
It is generally safe to drive the vehicle with this code, but it is recommended to address the underlying issue as soon as possible to prevent further complications.
7. How much does it typically cost to repair OBDII code P249E GMC?
The cost of repair can vary depending on the extent of the issue and the specific components that need to be replaced. It is advisable to consult with a professional mechanic for an accurate estimate.
8. Can I reset the OBDII code P249E GMC on my own?
While you can reset the code using an OBDII scanner, it is important to address the root cause of the issue to prevent the code from reappearing.
9. Are there any recalls related to OBDII code P249E GMC?
Recalls related to this specific OBDII code may vary by vehicle make and model. It is recommended to check with the manufacturer or dealership for any relevant recalls.
10. How can I prevent OBDII code P249E GMC from occurring in the future?
Regular maintenance, such as checking and replacing the reductant system components as needed, can help prevent this code from occurring in the future.
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