P0414Powertrain
Powertrain · SAE
Secondary Air Injection Switching Valve A Circuit Shorted
Meaning
The ECM has detected a short circuit in the control circuit of secondary air injection switching valve A. The short may be to ground or to supply voltage, and prevents correct control of the valve.
Common causes
- Damaged wiring with abraded insulation causing a ground short on the control line
- Internal short of solenoid winding to valve body (ground)
- Wiring harness contacting hot metal components or sharp edges
- Damaged connector with pins shorted to each other or to the body
- Supply voltage inadvertently applied to the ECM control pin
Symptoms
- MIL light on, DTC P0414 stored
- Switching valve not controllable by the ECM
- Secondary air injection system inoperative
- Possible blown circuit fuse in case of persistent ground short
- Elevated HC and CO emissions during warm-up phase
Severity
Medium severity: the short circuit disables valve control and can damage the ECM driver output if unresolved; no immediate driving hazard.
What to do
- Read all DTCs and note freeze frame data
- Disconnect the valve connector and measure wiring resistance to ground and to supply voltage with a multimeter
- Inspect the wiring harness along its full length for abrasion, crushing, or contact with metal components
- Measure internal solenoid resistance to body: very low values (< 1 Ω to ground) indicate an internal short
- Repair damaged wiring or replace the shorted valve, then clear the code and verify