Code
P1145
DAEWOO
P — Powertrain
MAIN DUTY SOL. MAL
Views:
UK: 3
EN: 7
RU: 3
AI status
Completed
Completed
100%
Causes
- Open or short in solenoid wiring (connector, harness, broken wire)
- Poor or corroded electrical connector pins or grounds
- Failed main duty solenoid (stuck, mechanical failure or internal short)
- Contaminated or clogged solenoid/valve body (dirt, carbon, oil)
- Faulty ECM/PCM driver or software/calibration error
- Intermittent connection from vibration or heat
Symptoms
- Check Engine Light (MIL) illuminated
- Irregular idle, rough running or stalling (if solenoid affects idle/EGR/fuel)
- Reduced engine performance or drivability issues
- Transmission shift problems (if solenoid used by transmission)
- Poor fuel economy or increased emissions
What to check
- Retrieve freeze frame and readiness status with a scan tool; note related codes
- Visually inspect solenoid connector and wiring for damage, corrosion or pin push-out
- Backprobe supply and ground at the solenoid connector while cranking/running
- Measure solenoid coil resistance with an ohmmeter (compare to spec)
- Observe solenoid command/duty cycle and response with a scope or scan tool
- Inspect the solenoid body/valve for contamination if accessible
Signal parameters
- Typical coil resistance: often in the range 10–50 ohms (model-dependent) — consult service data
- Supply voltage at connector when activated: ~12 V (battery voltage) or pulsed via driver
- Control signal often PWM: duty cycle 0–100% depending on commanded position
- Expected change in duty cycle or voltage when ECM commands solenoid ON vs OFF
- No continuity or very low/high resistance indicates electrical fault
Diagnostic algorithm
- Connect a capable OBD-II scan tool. Read and record P1145 and any related codes and live data. Clear codes and perform a drive cycle to reproduce.
- Perform a visual inspection of the solenoid, connector and wiring harness. Look for chafing, heat damage, corrosion, water intrusion, or rodent damage.
- With ignition OFF, disconnect the solenoid connector and check coil resistance across the appropriate terminals. Compare to factory spec. Replace solenoid if resistance is out of range or open/shorted.
- Reconnect and backprobe the harness. With ignition ON or engine running as required, check for proper supply voltage and a solid ground. Wiggle the harness to check for intermittent faults.
- Use a lab scope or scan tool to monitor the ECM command (PWM/duty) and the actual solenoid response. Confirm the ECU is commanding the solenoid and that the solenoid follows the command.
- If supply/ground and coil are good but no operation, check for voltage drop in supply or ground circuits and test continuity to ECM. Repair any wiring faults.
- If wiring and solenoid test good but command signal is absent or erratic, suspect ECM driver fault; confirm with a second harness/solenoid swap or consult manufacturer service procedures before replacing ECM.
- If solenoid was contaminated, clean or replace as required. After repairs, clear codes and verify repair by repeating drive/test conditions until code does not return.
Likely causes
- Damaged connector at the solenoid (water/corrosion)
- High resistance in ground or supply circuit causing weak activation
- Solenoid coil open or shorted
- Internal blockage preventing valve movement
- ECM output transistor degraded or failed
Fault status
Status
MAIN DUTY SOL. MAL — Main duty solenoid circuit or response abnormal. Check solenoid, wiring, connectors and ECM driver.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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