Code
P006F
Generic
P — Powertrain
Turbocharger/Supercharger Boost Control A Supply Voltage Circuit High
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UK: 17
EN: 28
RU: 12
AI status
Completed
Completed
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Causes
- Short to battery voltage on boost control A supply or feedback circuit
- Open or corroded ground or poor connector contact raising measured voltage
- Faulty boost control solenoid/actuator with internal short
- Incorrect or damaged aftermarket wiring or harness repair
- Faulty ECM (internal driver or sensing circuit)
- Intermittent short introduced by wiring chafing or pin damage
Symptoms
- Check Engine MIL illuminated
- Reduced engine power or limp mode
- Erratic boost control: overboost or underboost
- Poor acceleration or hesitation under load
- Possible stored multiple related boost/pressure codes
What to check
- Read freeze frame and related PID data (boost pressure, commanded duty, supply voltage) with a scan tool
- Visual inspection of turbo actuator/solenoid wiring, connectors, and harness for damage or corrosion
- Check battery voltage and charging system for abnormal high voltage (>14.8 V)
- Back-probe and measure voltage at the boost control solenoid supply and signal pins with ignition ON and engine OFF/ON
- Wiggle test harness while monitoring voltage/PIDs to try to reproduce the fault
- Disconnect the boost control solenoid/actuator and see if code sets or changes (compare voltages)
Signal parameters
- Expected supply reference: typically 5 V reference or battery/ignition supply depending on design — verify factory spec
- Typical battery/ignition supply nominal: ~12–14.5 V; excessive detection threshold often >14.5–15 V for 12 V circuits
- For 5 V reference circuits, high threshold commonly >5.5 V (consult OEM spec)
- Typical solenoid current draw: small fraction of an amp to a few amps depending on design — check OEM
- ECM sensor/driver thresholds and diagnostic windows vary by manufacturer; always reference vehicle documentation
Diagnostic algorithm
- Confirm code with scan tool, record freeze frame and live PIDs (boost pressure, supply voltage, battery voltage).
- Visually inspect boost control solenoid/actuator, connectors, and wiring for damage, corrosion, pin push-out, or aftermarket taps.
- Measure battery voltage and charging system voltage with DMM. Note any over-voltage condition.
- With ignition ON, back-probe the supply and signal pins at the boost control solenoid connector and compare to ECM reference. Note voltages.
- With connector connected, start engine and monitor supply/feedback voltage while commanding the solenoid via scan tool (if possible). Check for abnormal high voltage under command.
- If high voltage is present at the solenoid, trace the supply wire back toward the fuse/relay or battery to find a short to B+; unplug intermediate connectors and re-test to isolate segment.
- Disconnect the boost control solenoid and measure resistance between supply and ground; look for shorts or low resistance indicating internal failure.
- Test continuity between solenoid connector and ECM connector pins. Repair broken wires or poor connections as found.
- If wiring and solenoid check good, and supply voltages at the ECM pins are out of spec, consider ECM-level fault — verify with manufacturer diagnostics before ECM replacement.
- Clear codes and road test to verify repair. Re-scan for any reoccurring or related codes.
Likely causes
- Shorted supply wire at harness/connector to battery voltage
- Corroded or pushed-out terminal in boost solenoid/ECM connector
- Failed boost control solenoid (internal short or leakage)
- Blown or incorrect inline fuse or relay causing abnormal rail voltage
- ECM output/sense circuit fault (less common)
Fault status
Status
The ECM detected the boost control A supply/feedback circuit voltage is higher than the allowed threshold. Likely causes include a short to battery voltage, connector/wiring fault, defective boost control solenoid, or seldom an ECM sensing/driver failure. Repair requires electrical diagnosis of the harness, connector, solenoid, and verification of supply rails.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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