P0490 Code - Exhaust Gas Recirculation Throttle Control Circuit 'A' Circuit High

What Does P0490 Mean?

OBD-II Code Powertrain Control Module (PCM) failure is defined as a Exhaust Gas Recirculation "A" Control Circuit High

EGR (Exhaust Gas Recirculation) systems are used to reduce the combustion temperature, thus reducing emissions. If the engine control module (PCM) does not detect the amount of flow requested from the EGR, it will set code P0490.

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What are the common causes of P0490 ?

• Faulty IMRC actuator relay (if equipped)
• A large air leak at or near the number one oxygen sensor would also cause a lean mixture.
• Defective ECU strategies or components will prevent proper regeneration

How do you troubleshoot P0490 ?

After ensuring that the electrical components are not responsible for the storage of the
P0490 code, the mechanic has several repair options available:

• Use a scanner to monitor EGR function, and manually compare the information to the
• manufacturer’s specifications.
• Check and repair the EGR valve, control solenoid, sensor, or DPFE sensor, as
• necessary.
• Disconnect the vacuum line, and manually apply vacuum to the EGR valve to observe
• the operation.
• Remove the EGR valve and clear any clogs.
• Check that the computer is working correctly, and replace if necessary.
• Test all connectors and wiring for the PCM, and repair or replace as necessary.

After each of these repairs, the code should be cleared and the system should be retested. The more repairs that are checked off the list, the easier it will be for a technician to narrow down the true cause behind the P0490 code.

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