P1495 Secondary Air Relief Solenoid Circuit
The P1495 code indicates a malfunction in the electrical circuit of the secondary air relief solenoid. This solenoid, controlled by the powertrain control module (PCM), manages the flow of secondary air injected into the exhaust during cold starts to reduce emissions. The PCM detects a fault when the voltage signal in the solenoid circuit deviates from expected parameters, such as out-of-range voltage, an open circuit, or a short to ground or voltage.
01. Most Common Causes
- Faulty or internally shorted secondary air relief solenoid
- Open or shorted wiring in the solenoid circuit
- Corroded, bent, or poorly connected electrical connector
- Blown fuse in the secondary air system
- Faulty solenoid control relay
- Defective PCM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Possible increased emissions during cold start
03. Step-by-Step Diagnosis
Scan for codes and verify P1495 is present
Inspect the secondary air relief solenoid connector and wiring for damage, corrosion, or loose connections
Test the solenoid resistance and compare to manufacturer specifications
Check the fuse and relay for the secondary air system
If all else is okay, test the PCM output signal to the solenoid
1. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive with this code, as it is low severity. However, the Check Engine Light will be on, and emissions may be slightly elevated. It is recommended to have it repaired soon to avoid potential issues with emissions testing.
How much does it cost to fix?▼
The cost to fix a P1495 code typically ranges from $100 to $400, depending on the cause. Replacing the solenoid itself is usually $50-$150, plus labor. Wiring repairs or relay replacement may be less expensive.