Code
P1022
DACIA
P — Powertrain
Fuel pressure regulator control solenoid 1/2 - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Open or short in solenoid wiring (power or ground)
- Poor connector contact or corrosion at solenoid or ECU plug
- Failed fuel pressure regulator control solenoid (coil open/short or intermittent)
- Blown fuse or faulty relay supplying the solenoid circuit
- Low battery or poor chassis/engine ground
- ECU driver/transistor fault
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or limp-home mode
- Hard starting or extended cranking time
- Poor acceleration or hesitation under load
- Reduced fuel economy or rough idle
- Possible fuel smell if regulator leaking
What to check
- Read freeze frame and live data with a scan tool; note fuel rail pressure behavior and stored related codes
- Visual inspection of solenoid connector and wiring for damage, corrosion or oil/fuel contamination
- Check relevant fuse(s) and fuel pump/ECU power relay
- Back-probe solenoid connector with ignition ON / engine running: check supply voltage and switching ground/PWM signal
- Measure solenoid coil resistance with multimeter (compare to factory spec or typical range)
- Check continuity between solenoid connector and ECU pin for opens/shorts
Signal parameters
- Supply voltage (solenoid power) with ignition ON: ~11–14 V (battery voltage)
- Coil resistance (typical generic range): 5–30 Ω (refer to factory spec for exact value)
- Control type: ECU switches ground or modulates with PWM (variable duty cycle)
- Typical PWM frequency (generic): ~20–300 Hz depending on manufacturer; duty cycle varies 0–100% to control pressure
- Expected behavior: control line toggles/pulses when engine running and regulator active; no low-impedance short to ground or battery
Diagnostic algorithm
- Confirm code and check for multiple related DTCs (fuel rail pressure, fuel pump, injector circuits). Record freeze frame.
- Visually inspect solenoid, connector and wiring for damage, corrosion, heat or fluid contamination. Repair obvious damage.
- Verify power: with ignition ON measure supply pin at solenoid connector — should be battery voltage. Check associated fuse/relay if absent.
- Measure coil resistance between solenoid terminals with connector disconnected. Compare to factory spec or typical 5–30 Ω. Replace if open or shorted.
- With connector connected and engine running (or cranking if required), back-probe control pin and check for switching (grounding) or PWM using a multimeter (duty cycle) or oscilloscope (frequency/duty).
- Check continuity from solenoid connector to ECU control pin; check for short to battery or ground. Repair wiring if continuity issues found.
- Perform wiggle test on wiring harness and connectors while monitoring the signal to reproduce intermittent faults.
- If wiring and connector OK but solenoid does not respond, bench-test solenoid briefly with fused 12 V supply to confirm movement (observe safety—do not exceed a few seconds). Replace if it fails to actuate.
- After repairs, clear codes and test drive while monitoring fuel rail pressure and related parameters to confirm proper operation and no return of the code.
- If all wiring and solenoid check good and fault persists, consider ECU driver fault; consult factory diagnostics before ECU replacement.
Likely causes
- Damaged or chafed harness to the solenoid
- Corroded or bent pin at solenoid connector
- Intermittent coil connection (water ingress)
- Failed solenoid coil
- Loose or weak ground at engine harness
Fault status
Status
Fuel pressure regulator control solenoid 1/2 — circuit malfunction. ECU has detected an electrical fault in the solenoid control circuit; fuel pressure regulation may be impaired.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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