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P0489 is a diagnostic trouble code (DTC) for "Exhaust Gas Recirculation “A” Control Circuit Low". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The P0489 code is a generic powertrain code related to auxiliary emissions control. If this code is stored, it is stated that the exhaust gas recirculation (EGR) “A” control circuit is reporting a low voltage flow.
Codes related to the P0489 include:
When a P0489 code is stored, it means that the engine control module (ECM) has detected a fault with an electrical component of the EGR system. The EGR system works to prevent the release of harmful emissions into the environment. To maintain cylinder head pressure, the EGR system is operated through the ECM, which opens or closes the EGR valve depending on the vehicle’s speed, temperature, and load.
The ECM has a preset degree of allowed change in the exhaust manifold. If the proper exhaust flow is not detected when the EGR valve is activated, a P0849 code can be stored. Depending on the make and model of your vehicle, an EGR position sensor may be used to monitor the EGR valve while the ECM determines the desired EGR flow based on how far open the valve is at the time. Some automakers measure manifold air pressure and exhaust feedback with a Delta Pressure Feedback EGR (DPFE) sensor.
Several problems may cause a P0489 code including:
Symptoms of a P0489 code may include:
A mechanic may use several methods to diagnose a P0489 trouble code, including:
Utilize an OBD-II scanner to check for a stored P0489 trouble code
Visually inspect all wiring and electrical connectors and harnesses for damages or defects
Visually inspect all vacuum hoses, lines, and connectors for damage or leaks
Determine how the EGR valve system is controlled (by ECM or vacuum)
Monitor EGR function and compare with manufacturer recommendations
Determine if the EGR valve is sticking
Use a handheld vacuum pump to observe EGR operation to determine if the valve opens
If vehicle does not stall when valve opens, check for clogged EGR passages
If the engine stalls, check if the EGR control solenoid is working
Test EGR control solenoid connector for a voltage and ground signal
Test for a voltage signal between the ECM and EGR electrical connector
Check for damaged, loose, or burnt wiring at the EGR valve and control solenoids or EGR and DPFE sensor
The EGR valve is an expensive component to replace, and often when the P0489 code appears, many will be quick to replace it versus fully diagnosing the issue, which could simply be damaged wiring or a blown gasket.
Because a vehicle’s safe driving operation should not be impacted due to faults that store a P0489 code, but the vehicle can emit more harmful emissions, this code is considered a potentially serious code. When this code appears it is recommended to immediately take your vehicle to your local service center or mechanic for repair and diagnosis.
Several repairs can fix a P0489 trouble code and include:
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