P1490 on Buick
Secondary Air Relief / Injection Solenoid Circuit Malfunction
P1490 on Buick vehicles indicates secondary air relief / injection solenoid circuit malfunction. Au7o has documented this code across 1 Buick model — most commonly on Encore. This is a manufacturer-specific code whose exact meaning varies by maker; on Ford it commonly indicates a fault in the secondary air relief solenoid circuit (part of the system that injects air into the exhaust to reduce cold-start emissions), while some applications use it for an EVAP or vacuum solenoid circuit. The computer detected that the solenoid circuit is open, shorted, or out of range. It is primarily an emissions-system fault and not an immediate drivability danger. Confirming the exact definition against the specific vehicle is recommended.
Common Causes of P1490
- •Faulty secondary air (or vacuum) solenoid
- •Open or shorted wiring in the solenoid circuit
- •Corroded or loose electrical connector
- •Vacuum leak or collapsed vacuum hose
- •Failed secondary air pump or related relay
- •PCM driver circuit fault (less common)
P1490 on Buick by Model
Buick Encore(1 issue)
- EVAP Purge Pump Can Fail (Special Coverage N242484740)2022
GM Special Coverage N242484740 identifies certain 2022 Buick Encore vehicles whose evaporative-emissions purge pump can fail. The documented symptoms are a check-engine light and one or more purge-pump diagnostic trouble codes.
Looking for P1490 on a different make?
View P1490 across all makes →Frequently Asked Questions
What does P1490 mean on Buick?▼
P1490 stands for "Secondary Air Relief / Injection Solenoid Circuit Malfunction." This is a manufacturer-specific code whose exact meaning varies by maker; on Ford it commonly indicates a fault in the secondary air relief solenoid circuit (part of the system that injects air into the exhaust to reduce cold-start emissions), while some applications use it for an EVAP or vacuum solenoid circuit. The computer detected that the solenoid circuit is open, shorted, or out of range. It is primarily an emissions-system fault and not an immediate drivability danger. Confirming the exact definition against the specific vehicle is recommended. On Buick specifically, this code is documented across 1 model.
What causes P1490 on Buick vehicles?▼
Common causes on Buick: Faulty secondary air (or vacuum) solenoid, Open or shorted wiring in the solenoid circuit, Corroded or loose electrical connector, Vacuum leak or collapsed vacuum hose, Failed secondary air pump or related relay. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P1490 on a Buick?▼
Repair costs vary widely depending on the root cause and specific Buick model.
Which Buick models have P1490 documented?▼
Au7o has documented P1490 on 1 Buick model: Encore.