Code
P1015
DACIA
P — Powertrain
Turbocharger (TC) system - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Broken, corroded or disconnected wiring or connector in turbo actuator/solenoid circuit
- Failed turbo actuator (electronic or vacuum-controlled) or boost control solenoid
- Blown fuse or faulty relay supplying the turbo control circuit
- Poor ground at ECM or actuator
- Intermittent circuit due to chafing, heat damage or water ingress
- Faulty ECM or incorrect software/calibration
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or limp-home mode
- Poor turbo response / low boost pressure
- Unexpected boost surges or overboost protection
- Hesitation or poor acceleration under load
- Intermittent faults that may clear after restart
What to check
- Read and record live data and freeze frame with a diagnostic scanner; note boost, commanded duty, actuator position
- Inspect wiring harness and connector at turbo actuator/solenoid for damage, corrosion, loose pins or water
- Check fuses and relays supplying the turbo control circuit
- Backprobe connector to check supply voltage and ground while commanding actuator from scanner
- Measure actuator/solenoid resistance and compare to specification (see vehicle manual)
- Check for vacuum leaks and condition of vacuum lines if actuator is vacuum operated
Signal parameters
- Supply voltage to turbo control solenoid/actuator: typically battery voltage (~11–14V) with ignition ON
- Control signal from ECM may be switched ground or PWM — common PWM duty from 0–100% at tens to a few hundred Hz
- Position/feedback sensors (if present) typically report 0.5–4.5 V range; values vary by model
- Actuator coil/solenoid resistance: small solenoids often tens to hundreds of ohms (refer to service data)
- Look for fast switching or loss of signal while commanding actuator with scan tool
Diagnostic algorithm
- Connect a professional scan tool, read DTCs and live data; note boost command vs actual boost and actuator feedback.
- Clear codes, perform a road/shop test to reproduce fault and capture live data.
- Visually inspect connector and wiring to the turbo actuator/solenoid; repair any obvious damage.
- With ignition ON, backprobe connector: confirm battery supply and good ground. If no supply, trace fuse/relay and repair.
- Command actuator/solenoid with scan tool while measuring signal (voltage or PWM) at connector; verify response and compare to expected behavior.
- Measure resistance of actuator/solenoid out of circuit; bench-test actuator where applicable (apply correct voltage or vacuum).
- Check continuity between ECM and actuator connector; repair short/open circuits or replace damaged harness sections.
- Inspect and test related sensors (MAP/boost sensor) and vacuum lines — correct any leaks that affect control feedback.
- If wiring and actuator test good, check ECM outputs and grounds; consider ECU software updates or replacement as last resort.
- After repairs, clear codes and verify on-road that boost control is restored and code does not return.
Likely causes
- Damaged connector pins or corrosion at turbo actuator/solenoid connector
- Open or short in wiring between ECM and turbo actuator/solenoid
- Failed boost control solenoid (stuck or no response)
- Weak/failed ground or missing supply voltage to the circuit
- Vacuum hose leak (if vacuum actuator) causing apparent circuit fault during functional test
Fault status
Status
Turbocharger system circuit malfunction detected. ECM has flagged a fault in the turbo control/actuator circuit (P1015). Electrical inspection of connectors, wiring, fuses and the actuator/solenoid required.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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