P0490 2017 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 2017 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 2017 Chevrolet Silverado Description
What are the Possible Causes of the DTC P0490 2017 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 2017 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 2017 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 2017 Chevrolet Silverado code?
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Frequently Asked Questions about P0490 2017 Chevrolet Silverado Code
1. What does the OBDII code P0490 mean on a 2017 Chevrolet Silverado?
P0490 indicates a problem with the Exhaust Gas Recirculation (EGR) motor control circuit, specifically a high voltage issue.
2. What are the common symptoms of code P0490 in a 2017 Silverado?
Symptoms may include an illuminated check engine light, reduced engine performance, rough idling, increased emissions, and possible hesitation during acceleration.
3. What causes the P0490 code on a Chevy Silverado?
Common causes include a faulty EGR valve, wiring issues like damaged connectors or short circuits, a malfunctioning EGR control solenoid, or a problem in the powertrain control module (PCM).
4. Can I still drive my 2017 Silverado with a P0490 code?
While the truck may still run, driving with a P0490 code can lead to reduced fuel efficiency, poor engine performance, and potential long-term damage to the emission system.
5. How do I diagnose the P0490 code on my 2017 Silverado?
Start by inspecting the EGR valve and its wiring for damage or loose connections. Use a multimeter to check for proper voltage and continuity in the EGR motor control circuit. You may also need a scan tool to monitor EGR system data.
6. What repairs might fix the P0490 code on a Chevy Silverado?
Repairs could include replacing a faulty EGR valve, repairing or replacing damaged wiring or connectors, cleaning the EGR passages, or reprogramming or replacing the PCM if necessary.
7. How much does it cost to fix a P0490 code on a 2017 Silverado?
The cost varies depending on the issue. Replacing an EGR valve typically costs $150-$400, while wiring repairs or PCM replacement can range higher.
8. Can a dirty EGR valve cause the P0490 code to appear?
Yes, a clogged or dirty EGR valve can lead to improper operation and trigger the P0490 code due to high voltage readings in the circuit.
9. Will clearing the P0490 code fix the problem?
Clearing the code may temporarily turn off the check engine light, but the issue will likely return unless the underlying cause is addressed.
10. What tools do I need to troubleshoot the P0490 code on my Silverado?
You’ll need an OBDII scanner, a multimeter, and basic tools for inspecting and repairing components like the EGR valve and wiring.
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