P0490 2016 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0490 2016 Chevrolet Silverado?
- 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 Chevrolet Silverado?
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 Chevrolet Silverado 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.
Need more information about the P0490 2016 Chevrolet Silverado code?
Need more information on how to fix the P0490 2016 Chevrolet Silverado code? Get Access to Factory Service Manuals
Need Help with the Code?
Get the P0490 2016 Chevrolet Silverado code diagnosed by a professional: Find a repair shop in your area
Frequently Asked Questions about P0490 2016 Chevrolet Silverado Code
1. What does the OBDII code P0490 mean on a 2016 Chevrolet Silverado?
P0490 indicates a high voltage issue in the Exhaust Gas Recirculation (EGR) motor control circuit, suggesting an electrical fault or malfunction in the EGR system.
2. What are the common symptoms of code P0490 on a 2016 Silverado?
Symptoms may include an illuminated check engine light, reduced engine performance, rough idling, poor fuel economy, and possible engine knocking or hesitation.
3. What causes the P0490 code to appear on a 2016 Chevrolet Silverado?
Common causes include a faulty EGR valve, damaged EGR motor, wiring or connector issues (such as corrosion or breaks), or a malfunctioning EGR control module.
4. Can I drive my 2016 Silverado with a P0490 code?
Driving with a P0490 code is not recommended, as it can lead to increased emissions, poor performance, and potential engine damage if left unresolved.
5. How do I diagnose the P0490 code on my 2016 Chevrolet Silverado?
Start by inspecting the EGR valve, wiring, and connectors for damage. Use a multimeter to test the voltage at the EGR motor and verify circuit integrity. A scan tool can also help monitor EGR system performance.
6. How do I fix the P0490 code on a 2016 Silverado?
Repairs may include replacing a faulty EGR valve or motor, repairing or replacing damaged wiring or connectors, cleaning carbon buildup in the EGR system, or updating the vehicle's ECU software if necessary.
7. Is the P0490 code covered under warranty for a 2016 Chevrolet Silverado?
It depends on the specific warranty coverage and mileage. Check your vehicle's warranty details or consult your dealership to confirm.
8. Can a dirty EGR valve cause the P0490 code?
Yes, carbon buildup in the EGR valve can restrict movement and cause electrical resistance, leading to high voltage in the control circuit.
9. How much does it cost to repair a P0490 code on a 2016 Silverado?
Repair costs can vary depending on the issue. Replacing an EGR valve typically costs $150–$400 for parts and labor, while wiring repairs may cost less.
10. Can a faulty PCM cause the P0490 code on a 2016 Chevrolet Silverado?
While rare, a malfunctioning Powertrain Control Module (PCM) can cause the P0490 code. However, this should be considered only after ruling out other potential causes.
Discuss the causes and fixes for P0490 2016 Chevrolet Silverado OBDII Code
Code P0490 2016 Chevrolet Silverado comments
No comments found for this page.
Fix Your Car Smarter
Try the New AutoCodes App!
Get complete OBDII diagnostics, repair solutions, and cost estimates, plus AI chat support on demand.
