You can usually drive gently for short trips, but power will be down or the engine in limp mode and boost is no longer controlled. Avoid hard acceleration and hauling — with the solenoid shorted the wastegate can default and let boost spike. Fix it soon. P0047 means the powertrain control module detected a LOW voltage — a short to ground or a driver pulled low — in the electrical circuit for the turbocharger or supercharger boost-control solenoid "A". That solenoid is the valve the PCM uses to regulate boost (it drives the wastegate), so with the circuit reading low the module loses boost authority and usually falls back to a reduced-power failsafe.
What P0047 means
On a boosted engine the PCM sets the boost limit by pulsing a boost-control solenoid with a variable duty cycle (PWM). On a gasoline turbo like Ford's 3.5L EcoBoost this is the turbocharger wastegate regulating valve solenoid: it meters pressure or vacuum to the pneumatically actuated wastegate diaphragm, and as compressor outlet pressure rises that actuator opens the wastegate to cap boost at the desired value. The solenoid runs on a simple two-wire circuit — a fused power feed on one pin and the PCM's driver on the other. P0047 is the circuit-LOW member of the family: the PCM commands the solenoid, monitors the voltage on its control line, and sets the code when it sees an abnormally low reading — typically a short to ground in the control wire, a shorted solenoid winding, or a driver held low. It is distinct from P0045 (circuit open — no current at all), P0046 (range/performance — the circuit works but boost doesn't track the command), and P0048 (circuit high). Note that Ford's own scan data reports this exact short-to-ground fault on the EcoBoost as P0245 ("Wastegate Solenoid A Low"); many other manufacturers report it directly as P0047. With boost control lost the PCM commonly pulls timing, caps torque, or drops into a reduced-power/limp mode to protect the engine, and because the wastegate reverts toward its spring default, pressure-actuated systems can overboost.
Symptoms
- Check-engine light on, usually stored with boost-related freeze-frame data
- Loss of power, poor throttle response, or the engine dropping into limp/reduced-power mode
- Flat, sluggish acceleration under load — the turbo never spools to full commanded boost
- Possible overboost spikes or a blown boost feeling, because a shorted solenoid lets the wastegate drift to its spring-default position
- Reduced fuel economy and, on some vehicles, a rough or hesitant feel when the engine tries to build boost
Common causes
- Short to ground in the solenoid control wire (Ford calls it the TCWRVS circuit) — the most common cause of the LOW reading
- Failed boost-control / wastegate regulating valve solenoid with a shorted internal winding
- Chafed or melted wiring near the hot turbo/exhaust area rubbing through to a grounded surface
- Damaged or corroded solenoid connector (Ford's is the two-pin C1246) with pins shorted or contaminated
- Control and power wires pinched or crushed together, or moisture in the connector bridging the circuit
- Water intrusion or corrosion in the harness creating a low-resistance path to ground
- Failed PCM solenoid driver stuck low (uncommon — verify the wiring, connector, and solenoid first)
Severity & driving advice
Severity: Moderate — Drivable but expect reduced power or limp mode; a shorted solenoid can leave the wastegate at spring default, risking overboost on some systems — repair soon.
Can I drive? You can usually drive gently for short trips, but power will be down or the engine in limp mode and boost is no longer controlled. Avoid hard acceleration and hauling — with the solenoid shorted the wastegate can default and let boost spike. Fix it soon.
Diagnostic approach
- Scan codes and read freeze-frame — Confirm P0047 and log any companion codes plus the RPM, load, and boost stored when it set. Note whether siblings P0045 (open), P0046 (range/performance), or P0048 (high), or overboost/underboost codes (P0234/P0299) are present, since they change the path. On a Ford EcoBoost the equivalent short-to-ground code appears as P0245.
- Inspect the solenoid connector and harness — Because P0047 is a short-to-ground/low fault, examine the boost-control (wastegate regulating valve) solenoid connector and the wiring run for chafed, pinched, or melted insulation, especially where the harness passes near the hot turbo or exhaust. Look for corrosion, moisture, or spread pins in the connector — on the EcoBoost this is the two-pin C1246.
- Identify the two circuits — The solenoid uses a fused power feed on one pin and the PCM control (driver) on the other. On the 2014 EcoBoost, C1246 pin 1 is the TCWRVS control circuit (an 18-gauge control wire) and pin 2 is the power feed. Confirm which wire is control and which is feed before probing so you test the right side for the short.
- Test the control wire for a short to ground — With the connector unplugged and the PCM disconnected, measure resistance from the solenoid control wire to ground. A very low or near-zero reading confirms the short to ground on that circuit. Wiggle-test the harness while measuring to catch an intermittent short that only appears with movement or heat.
- Measure the solenoid winding — With the connector off, measure resistance across the solenoid's two terminals and from each terminal to the solenoid body/ground. These PWM boost solenoids are low-resistance (often in the low tens of ohms — verify the exact spec for the vehicle); a reading far below spec, or any continuity from a terminal to the case, indicates a shorted solenoid rather than a wiring fault.
- Verify the power feed and PCM driver — Key-on, confirm the feed pin has voltage (check the fuse first). If the wiring and solenoid test good, the concern can be a PCM driver held low — back-probe the control line to see the commanded PWM signal, and only condemn the module after the harness and solenoid are cleared. Ford routes this to Pinpoint Test HN (Turbocharger System).
- Repair, command the solenoid, then road-test — After fixing the short, replacing the solenoid, or repairing the connector, use the scan tool's bidirectional test to cycle the solenoid and confirm it clicks and meters pressure/vacuum. Clear P0047, then drive under boost while graphing commanded vs. actual boost to confirm the turbo regulates properly and the code stays off.
FAQ
Is it safe to drive with a P0047 code?
For short, gentle trips usually yes, but the vehicle will likely be down on power or in a reduced-power/limp mode and the PCM can no longer regulate boost. Because a shorted boost-control solenoid can let the wastegate drift to its spring default and allow boost to overshoot, avoid hard acceleration and heavy loads and get it repaired soon.
What is the difference between P0047 and P0045, P0046, or P0048?
All four involve the same boost-control solenoid "A" circuit but describe different failure modes. P0047 is circuit LOW — the PCM sees an abnormally low voltage, usually a short to ground in the control wire or a shorted solenoid. P0045 is circuit open (no current flow), P0046 is range/performance (the circuit works but boost doesn't track the command), and P0048 is circuit high. P0047 is specifically the short-to-ground/low fault.
Why does my Ford EcoBoost show P0245 instead of P0047?
They describe the same fault. Ford's factory scan data reports the turbocharger wastegate regulating valve solenoid "A" short-to-ground condition as P0245 ("Wastegate Solenoid A Low"), while P0047 is the generic SAE name many other manufacturers use for the identical circuit-low condition. Diagnose them the same way — as a low/short-to-ground fault on the boost-control solenoid circuit.
Can a wiring or connector problem alone set P0047?
Yes — that is the most common cause. Because P0047 flags a low reading, a control wire chafed or pinched to ground, a corroded or moisture-bridged connector, or a wire crushed against the feed will set it even when the solenoid itself is fine. Ford's own diagnostic aids stress checking the harness for damage and intermittent faults, since the code only sets while the solenoid is energized. Inspect and test both wires and the connector before replacing the solenoid.
Does P0047 mean I need a new turbocharger?
Usually not. The fault is in the boost-control solenoid's electrical circuit — the wiring, connector, or the solenoid winding — not the turbo cartridge. Test the control wire for a short to ground and check the solenoid first; the turbocharger itself is rarely the cause of P0047.