Code
P1608
DAEWOO
P — Powertrain
Vacuum sol v/v elec. system
Views:
UK: 3
EN: 14
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the solenoid circuit (chafing, broken conductor, corrosion)
- Poor or corroded connector/terminal at the solenoid or ECU
- Failed vacuum solenoid (coil open, shorted, or mechanically stuck)
- Blown fuse or faulty relay supplying the solenoid circuit
- Low battery/poor ground or intermittent power supply
- Vacuum leak or blocked vacuum port causing incorrect feedback/operation
Symptoms
- Malfunction Indicator Lamp (MIL)/Check Engine Light illuminated
- Related system symptoms depending on valve function — rough idle, poor throttle response, reduced performance, elevated emissions or failed EVAP/idle control behavior
- Vacuum-operated system not responding (e.g., EGR/EVAP purge/brake vacuum control)
- Stored freeze frame data showing related engine conditions
What to check
- Read and record freeze frame and freeze data with a scan tool; confirm P1608 is current (not historic)
- Visual inspection of solenoid, connector and wiring for damage, corrosion or loose pins
- Check fuses and relays related to the solenoid circuit
- Back-probe the solenoid connector and check for battery voltage when commanded ON and good ground when commanded OFF (or vice versa depending on circuit)
- Measure solenoid coil resistance with multimeter (power removed) and compare to specification
- Command the solenoid ON/OFF with a scan tool and verify audible click or functional response
Signal parameters
- Typical supply: ~12 V battery feed to solenoid when powered (vehicle specific)
- Control: ECU provides switched ground or PWM control; when commanded the connector should show voltage change or ground continuity
- Coil resistance (typical range): ~10–50 ohms (manufacturer-specific; measure and compare to spec)
- Current draw when energized: commonly 0.1–1.5 A depending on coil resistance
- PWM control (if used): duty cycle varies 0–100 %; frequency commonly tens to a few hundred Hz (vehicle specific)
Diagnostic algorithm
- Verify DTC and note freeze frame data using a scan tool. If multiple DTCs exist, address related faults first.
- Visual inspection: check solenoid, vacuum lines, connector and harness for damage, corrosion or loose pins.
- Check related fuses and relays; replace if blown or faulty.
- With ignition ON, back-probe the solenoid connector and observe voltage/ground while commanding ON/OFF with scan tool. Record values.
- Measure coil resistance (engine OFF, connector disconnected). Compare to service specification; open or shorted coil indicates replacement.
- If resistance is within range but no actuation, bench-test the solenoid by applying battery power briefly to confirm click and vacuum flow/hold.
- Inspect vacuum hoses and ports for leaks or blockage; perform a vacuum hold test if applicable.
- If wiring shows intermittent or damaged conductors, perform continuity checks and repair wiring/connector as needed.
- If wiring and solenoid test good but no ECU output when commanded, check ECU driver circuit for shorts to battery/ground and repair or replace ECU only after confirming external circuit integrity.
- Clear codes and test drive; re-scan to ensure the DTC does not return.
Likely causes
- Damaged connector or corroded terminal at the solenoid
- Open or short in harness to the solenoid (rodent damage, chafing)
- Failed solenoid coil or valve not actuating
- Blown fuse or bad relay feeding the solenoid
- Vacuum line leak or restriction causing operational failure
- ECU output driver malfunction (least likely)
Fault status
Status
P1608 — Vacuum solenoid valve electrical system malfunction. Check wiring and connector, fuses/relays, solenoid operation and associated vacuum lines. Possible solenoid failure or ECU driver fault.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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