Code
P1015
RENAULT
P — Powertrain
- Turbocharger (TC) system - circuit malfunction
AI status
Completed
Completed
100%
Causes
- Damaged or corroded wiring/connectors between ECU and turbo actuator/solenoid
- Blown fuse or poor ground/power supply to actuator or solenoid
- Faulty turbo actuator (electrical or vacuum type) or solenoid valve
- ECU output driver fault
- Blocked, pinched, or disconnected vacuum/boost hoses (vacuum-operated systems)
- Intermittent connector contact due to vibration or moisture
Symptoms
- Reduced engine power or limp-home mode
- Loss of boost or inconsistent boost delivery
- Check Engine Light (MIL) illuminated
- Poor throttle response and increased smoke or fuel consumption
- Surge or hesitation under load
What to check
- Read and record freeze-frame data and all manufacturer-specific codes
- Visually inspect wiring and connectors at the turbo, solenoid(s), and ECU for damage or corrosion
- Check fuses and engine ground points related to the turbo control circuit
- Measure supply voltage and ground at the actuator/solenoid connector with key on
- Command the actuator/solenoid with a scan tool to verify operation (if supported)
- Inspect vacuum/boost hoses for leaks, restrictions, or disconnections
Signal parameters
- Control signal: ECU outputs either PWM duty cycle or switched 12V command — expect 0–100% duty when commanded
- Supply voltage at connector: ~11–14 V with key on/engine running
- Reference/sensor voltages (if equipped): typical 0.5–4.5 V (position sensor) or 0–5 V
- Solenoid coil resistance (typical range): roughly 10–60 ohms (varies by model) — consult OEM spec
- Actuator response: movement or pressure change should occur within a few seconds when commanded
Diagnostic algorithm
- Retrieve codes and freeze-frame data; note any related boost or sensor codes.
- Visually inspect connectors, harness, fuses, and grounds for corrosion, damage, or looseness.
- With connector disconnected, measure resistance of solenoid coil/actuator against OEM spec. Replace if open/shorted.
- Backprobe connector with a multimeter while commanding the actuator/solenoid with a scan tool: verify supply voltage, ground, and control signal (PWM or switched).
- If supply or ground missing, trace wiring back to fuse/relay/ECU and repair open or short circuits.
- If control signal present but actuator/solenoid does not move, replace the actuator/solenoid and re-test.
- Inspect and pressure-test vacuum/boost hoses and valves for leaks or blockages; replace damaged hoses.
- If wiring and components check OK but fault persists, consider ECU driver fault — confirm with manufacturer diagnostic procedures before replacing ECU.
- Clear codes and perform road test under load to confirm repair; re-scan for any returning codes.
Likely causes
- Open or shorted wiring to the turbo control solenoid or actuator
- Failed boost control solenoid (stuck or coil open/short)
- Poor ground or supply voltage to the circuit
- Failed turbo actuator (no response to commanded movement)
- Contaminated or collapsed vacuum/boost hose affecting actuator operation
Fault status
Status
Turbocharger control circuit malfunction detected — electrical/signal fault to turbo actuator/solenoid.
Repair difficulty: Medium
Diagnostic time: 1.5-3.5 hours
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