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P0490 Buick Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

- Code Popularity: 212 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
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Code P0490 Buick Possible Causes

  • Faulty Exhaust Gas Recirculation (EGR) Valve
  • Exhaust Gas Recirculation Valve harness is open or shorted
  • Exhaust Gas Recirculation Valve circuit poor electrical connection
  • Faulty Engine Control Module (ECM)

How do I Fix the Code P0490 Buick?

Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.

Does your Buick have Safety Recalls? → Check here

What is the Cost to Diagnose the Code P0490 Buick?

Labor: 1.0

The cost of diagnosing the P0490 Buick code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.

What are Code P0490 Buick Possible Symptoms?

  • Engine Light ON (or Service Engine Soon Warning Light)

Code P0490 Buick Description

The Engine Control Module (ECM) supplies the Exhaust Gas Recirculation (EGR) valve with a 5 V reference circuit, a low reference circuit, an H-bridge motor directional control circuit, and a signal circuit. The EGR position sensor provides a signal voltage that changes relative to the EGR position. The EGR position sensor information is transmitted between the EGR valve and the ECM on the signal circuit. The Mass Air Flow (MAF) sensor signal is used by the ECM to detect the proper amount of EGR flow. The ECM will close the EGR valve, then open the EGR valve to 100%. The ECM will then calculate the MAF difference and determine if the proper EGR flow has been detected. The Diagnostic Trouble Code (DTC) will be set when the ECM detects a short to voltage on the control circuit for greater than 2.5 s.
OBDII Code P0490 Buick - Exhaust Gas Recirculation Motor Control Circuit High Voltage -
P0490 Buick Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage

Need More Information on the P0490 Buick Code?

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