Code
P0416
GWM
P — Powertrain
- Intake manifold valve B open
AI status
Completed
Completed
100%
Causes
- Failed intake manifold runner actuator (motor or vacuum solenoid)
- Stuck or binding runner valve due to carbon/deposits or mechanical wear
- Broken, frayed or disconnected wiring or poor connector/corroded pins
- Loss of vacuum supply or leaking vacuum hose (if vacuum‑actuated)
- Faulty position sensor or feedback circuit (if equipped)
- ECU software or calibration issue (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine performance or hesitation at some RPM ranges
- Rough idle or surging when the intake runners are commanded to change
- Reduced fuel economy
- Failed emissions test or elevated exhaust emissions
What to check
- Read freeze frame and full scan-tool data for related codes and conditions when the code set
- Inspect actuator harness and connector for damage, corrosion, or poor fit
- Command the intake manifold valve B on/off with a scan tool and observe movement/response
- Listen for actuator operation while commanding; feel/palpate for movement if safe
- Measure supply voltage and ground at the actuator connector with key on/engine running
- Check actuator coil/solenoid resistance and compare to manufacturer spec (typical tens of ohms)
Signal parameters
- Control signal: ECU command (may be PWM duty cycle 0–100% or switched 12V on/off depending on actuator)
- Position feedback: 0–5 V position sensor or feedback signal (when equipped) — compare target vs actual
- Supply voltage at actuator connector: ~12 V with ignition on (where applicable)
- Ground continuity: low ohms to chassis ground
- Actuator coil/solenoid resistance: within manufacturer specification (typically in the tens of ohms range)
- Expected behavior: actuator moves within commanded time (several hundred ms to a few seconds)
Diagnostic algorithm
- Read and record all DTCs and freeze frame data. Note engine conditions when fault set (temperature, RPM, load).
- Visually inspect wiring and connectors at intake manifold valve B for damage, corrosion or loose terminals. Repair as needed.
- Using a scan tool, monitor the intake runner/valve B position PID (or relevant status) and command the valve on/off; observe reported position vs commanded.
- Backprobe actuator connector: verify reference voltage/supply and ground while commanding; check for correct control signal (voltage or PWM).
- Measure actuator coil or solenoid resistance and compare to spec. Replace actuator if open or out of spec.
- If vacuum‑actuated: check vacuum source and hoses for leaks; perform a smoke test if needed. Verify vacuum holds and actuator moves under vacuum.
- If actuator appears electrically healthy but valve does not move, remove intake cover as required and inspect valve/shaft for carbon build‑up or mechanical obstruction. Clean or repair as required.
- Repair or replace damaged wiring, connector, actuator, or valve assembly. If replacing mechanical components, verify correct installation and operation.
- After repairs, clear codes and perform a full drive cycle and functional test commanding the valve to ensure the code does not return.
- If all hardware checks good and problem persists, evaluate for ECU software updates or deeper electrical diagnosis (e.g., scope the control signal).
Likely causes
- Actuator failed to move or provide feedback (electrical or mechanical)
- Carbon build-up on valve/shaft preventing closure
- Open or short in control or ground circuit to the actuator
- Vacuum line disconnected or leaking (if applicable)
- Connector corrosion or pin damage at actuator plug
Fault status
Status
Intake manifold valve B is detected in the open position or its position sensor/feedback indicates open when a different position is expected. Inspect actuator, wiring, vacuum (if applicable) and the valve for mechanical binding or carbon build‑up.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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