What does code P1459 mean?

Q: What does code P1459 mean?

EVAP Purge Flow Switch Malfunction. P1459 on a Honda means the powertrain control module (PCM) has detected an unexpected signal from the EVAP (evaporative emission) purge flow switch, which monitors whether fuel vapor is actually being drawn from the charcoal canister into the intake. The PCM commands the purge control solenoid to open and close under specific conditions, then compares the switch response to what it expects; when the switch does not toggle or stays stuck, the PCM stores this code.

DTC codes / Honda codes / P1459

P1459 · HondaEVAP Purge Flow Switch Malfunction

P1459 on a Honda means the powertrain control module (PCM) has detected an unexpected signal from the EVAP (evaporative emission) purge flow switch, which monitors whether fuel vapor is actually being drawn from the charcoal canister into the intake. The PCM commands the purge control solenoid to open and close under specific conditions, then compares the switch response to what it expects; when the switch does not toggle or stays stuck, the PCM stores this code.

SystemPowertrain

Code typeHonda specific

SeverityLow

Fix difficultyIntermediate

AreaAuxiliary emission controls

Guidance is general and written for Honda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.