Code
P1457
KIA
P — Powertrain
Purge Solenoid Valve Low System Malfunction
Views:
UK: 30
EN: 41
RU: 29
AI status
Completed
Completed
100%
Causes
- Failed or sticking EVAP purge solenoid (stuck closed or shorted)
- Open or shorted wiring/connectors to the purge solenoid
- Faulty PCM driver or poor ground at PCM
- Blown fuse or relay affecting purge circuit power/ground
- Blocked or collapsed vacuum hose, clogged purge path, or stuck valve plunger
- EVAP canister, vent valve, or fuel tank pressure sensor fault affecting control logic
Symptoms
- Check Engine Light (MIL) illuminated
- Possible rough idle or drivability issues if large purge flow occurs
- Failed EVAP system leak tests/inspection
- Reduced fuel economy (rare)
- No noticeable symptom other than MIL
What to check
- Read freeze frame and live data (purge valve commanded status, duty cycle, fuel tank pressure)
- Visually inspect purge valve, hoses, and connectors for damage or disconnection
- Check related fuses and relays
- Measure purge solenoid coil resistance with ohm meter
- Backprobe PCM connector to check command voltage/ground when commanded
- Smoke-test EVAP hoses and connections for leaks
Signal parameters
- Purge solenoid coil resistance: typically ~20–40 ohms (manufacturer-specific — consult manual)
- Supply voltage: battery voltage present at solenoid power feed (~12 V) with ignition ON
- Control signal: PCM typically switches ground (or supplies switched +12V on some systems); commanded state may be a PWM/duty-cycle signal
- When PCM commands OPEN: continuity to ground (or change in PWM duty) and valve should actuate, enabling measurable purge flow or change in fuel tank pressure/INTAKE MAF/idle depending on test method
- When uncommanded: valve should be sealed (no vacuum/purge flow into intake)
Diagnostic algorithm
- Retrieve codes, freeze frame, and live data. Confirm P1457 is current and note related EVAP codes.
- Visually inspect purge solenoid, EVAP hoses, and connectors for damage, disconnection, kinks, or contamination. Repair as needed.
- With ignition ON (engine OFF), disconnect connector and measure solenoid coil resistance. If out of spec, replace valve.
- Backprobe connector while commanding purge ON from a scan tool. Verify PCM command (ground or +12 V/PWM) and presence of battery voltage on supply pin.
- If no command from PCM, check fuse, relay, and wiring to PCM ground; wiggle test harness to reproduce fault.
- Bench-test valve by applying battery voltage (observe polarity/PCM type) to verify operation (valve should click and allow flow). Use caution and short pulses rather than continuous if unsure.
- Perform smoke or pressure test on EVAP lines to find leaks or restrictions that would prevent valve operation or cause abnormal readings.
- Monitor live data for purge flow, fuel tank pressure, and related sensors while commanding valve. Compare behavior to known-good values.
- If wiring and valve check good but no proper operation, perform PCM output circuit tests per service manual. Replace PCM only after confirming harness and component faults are ruled out.
- Clear codes and road-test to confirm repair; verify no reoccurrence and run EVAP monitor to completion.
Likely causes
- Contaminated or seized purge solenoid
- Corroded connector or broken wire in harness (pin corrosion, rodent damage)
- Ground or supply problem to the solenoid
- Failed PCM output (less common)
- Intake manifold vacuum leak or clogged EVAP lines preventing valve operation
Fault status
Status
P1457: EVAP purge solenoid reported low/stuck condition — inspect purge valve, wiring, and EVAP system.
Repair difficulty: Medium
Diagnostic time: 1.0-2.5 hours
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