P249D GMC Code - Closed Loop Reductant Injection Control At Limit – Flow Too Low
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
- P249D GMC indicates Closed Loop Reductant Injection Control At Limit – Flow Too Low.
- 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 P249D 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 P249D 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 P249D 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 P249D 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 P249D GMC Code
1. What are the common symptoms of OBDII code P249D "Closed Loop Reductant Injection Control At Limit – Flow Too Low" in a GMC vehicle?
- Common symptoms may include the illumination of the Check Engine Light (CEL), reduced engine performance, and potential emissions-related issues.
2. What are some possible causes of OBDII code P249D in a GMC related to closed loop reductant injection control?
- Possible causes may include a faulty reductant pump, a clogged reductant injector, wiring issues, or a malfunctioning reductant control module.
3. How can I diagnose the cause of OBDII code P249D in a GMC related to closed loop reductant injection control?
- Diagnosing the issue may involve performing a visual inspection of the reductant system components, checking for wiring harness damage, and using a scan tool to monitor reductant system data.
4. What are some repair tips for addressing OBDII code P249D in a GMC related to closed loop reductant injection control?
- Repair tips may include replacing a faulty reductant pump, cleaning or replacing a clogged reductant injector, repairing damaged wiring, or reprogramming the reductant control module.
5. Can I continue driving my GMC with OBDII code P249D related to closed loop reductant injection control?
- It is generally not recommended to continue driving with this code present, as it can lead to increased emissions, reduced engine efficiency, and potential damage to the emissions control system.
6. How urgent is it to address OBDII code P249D in a GMC related to closed loop reductant injection control?
- It is advisable to address this code promptly to prevent further issues and ensure proper functioning of the emissions control system in your GMC vehicle.
7. Is OBDII code P249D related to closed loop reductant injection control a common issue in GMC vehicles?
- While not extremely common, this code can occur in GMC vehicles equipped with a reductant injection system, particularly in models with high mileage or older vehicles.
8. Are there any recalls or technical service bulletins (TSBs) related to OBDII code P249D in GMC vehicles?
- It is recommended to check with a GMC dealership or online resources for any relevant recalls or TSBs related to this specific OBDII code in your vehicle.
9. Can I reset the Check Engine Light (CEL) after addressing OBDII code P249D in a GMC related to closed loop reductant injection control?
- Yes, once the underlying issue has been addressed and resolved, the CEL can be reset using a scan tool to clear the trouble code from the vehicle's memory.
10. How can I prevent OBDII code P249D related to closed loop reductant injection control from occurring in my GMC in the future?
- Regular maintenance, such as keeping up with scheduled service intervals, checking the reductant system components for any signs of wear or damage, and using high-quality diesel exhaust fluid, can help prevent this code from reoccurring.
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