P0490 2016 GMC Sierra Code - Exhaust Gas Recirculation Motor Control Circuit High Voltage
Quick Answer
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. Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection. 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
- P0490 2016 GMC Sierra indicates Exhaust Gas Recirculation Motor Control Circuit High Voltage.
- Common causes
- Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, Exhaust Gas Recirculation Valve harness is open or shorted, Exhaust Gas Recirculation Valve circuit poor electrical connection.
- 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 P0490 2016 GMC Sierra Description
What are the Possible Causes of the DTC P0490 2016 GMC Sierra?
- 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 to Fix the DTC P0490 2016 GMC Sierra?
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 P0490 2016 GMC Sierra 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 P0490 2016 GMC Sierra Code
1. What does the OBDII code P0490 mean on a 2016 GMC Sierra?
P0490 indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) motor control circuit, meaning the EGR system may not be functioning properly.
2. What are the common symptoms of the P0490 code on a 2016 GMC Sierra?
Symptoms may include the Check Engine Light turning on, reduced engine performance, rough idle, and increased emissions.
3. What causes the P0490 code to appear on a 2016 GMC Sierra?
Common causes include a faulty EGR valve, damaged wiring or connectors in the EGR circuit, a malfunctioning EGR control module, or a failed PCM (Powertrain Control Module).
4. Can I drive my 2016 GMC Sierra with the P0490 code?
While the vehicle may still operate, driving with this code can lead to reduced performance, higher emissions, and potential long-term engine damage if not addressed.
5. How do you diagnose the P0490 code on a 2016 GMC Sierra?
Diagnosis involves using an OBDII scanner to confirm the code, visually inspecting the EGR system wiring and connectors, testing the EGR valve operation, and checking for proper voltage and continuity in the EGR circuit.
6. How do you fix the P0490 code on a 2016 GMC Sierra?
Repairs may include replacing the EGR valve, repairing or replacing damaged wiring, cleaning carbon buildup in the EGR passages, or updating/replacing the PCM if necessary.
7. Can a dirty EGR valve cause the P0490 code on a 2016 GMC Sierra?
Yes, carbon buildup or debris in the EGR valve can restrict movement, leading to circuit issues and triggering the P0490 code.
8. How much does it cost to repair the P0490 code on a 2016 GMC Sierra?
Costs vary, but replacing an EGR valve typically ranges from $200 to $400, while wiring repairs or PCM replacements can cost more depending on the extent of the issue.
9. Does the P0490 code affect emissions testing on a 2016 GMC Sierra?
Yes, the P0490 code can cause the vehicle to fail an emissions test due to increased exhaust emissions and improper EGR functionality.
10. Can a bad PCM cause the P0490 code on a 2016 GMC Sierra?
Yes, though rare, a faulty PCM can misinterpret or fail to regulate the EGR motor control circuit, causing the P0490 code.
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