P249E Chevrolet 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 Chevrolet 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 Chevrolet 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 Chevrolet?
- 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 Chevrolet?
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 Chevrolet 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 Chevrolet Code
1. What does the OBDII code P249E mean on a Chevrolet?
P249E indicates that the closed-loop reductant injection control system has detected excessively high flow rates, which may affect the vehicle's emissions control.
2. What are the common symptoms of P249E in a Chevrolet?
Symptoms may include the check engine light turning on, reduced fuel efficiency, erratic engine performance, and increased emissions.
3. What causes the P249E code to appear on a Chevrolet?
Common causes include a malfunctioning reductant injector, a faulty exhaust gas temperature sensor, a clogged or damaged particulate filter, or issues with the reductant pump.
4. Can I drive my Chevrolet with the P249E code active?
While the vehicle may still be drivable, ignoring this code can lead to higher emissions and potential damage to the exhaust system over time.
5. How is the P249E code diagnosed on a Chevrolet?
Technicians typically use an OBDII scanner to retrieve the code, inspect the reductant system components, and check for sensor or injector malfunctions.
6. What repairs are commonly needed to fix the P249E code?
Repairs may include cleaning or replacing the reductant injector, replacing damaged sensors, addressing clogged filters, or repairing wiring connections in the reductant system.
7. How much does it typically cost to fix a P249E code on a Chevrolet?
The repair cost depends on the specific issue, but it can range from $200 to $800, depending on parts and labor.
8. Can a P249E code be caused by bad diesel exhaust fluid (DEF)?
Yes, contaminated or incorrect diesel exhaust fluid can cause issues in the reductant system, potentially triggering the P249E code.
9. How can I prevent the P249E code from occurring on my Chevrolet?
Regular maintenance of the reductant system, using high-quality DEF, and promptly addressing exhaust system issues can help prevent this code.
10. Will clearing the P249E code resolve the issue on a Chevrolet?
Clearing the code may temporarily turn off the check engine light, but the underlying issue must be addressed to prevent the code from returning.
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