P002A

Code

Generic P — Powertrain

B Camshaft Profile Actuator A Control Circuit/Open Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 23 EN: 89 RU: 42

AI status

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Page language: EN

Causes

Open or broken wiring in actuator control circuit
Corroded or poorly connected connector at actuator or ECM
Failed camshaft profile/variator actuator (solenoid)
Blown fuse or faulty relay supplying the actuator circuit
Poor or missing ground to actuator or ECM
Short to battery/short to ground in control harness

Symptoms

Malfunction Indicator Lamp (MIL/Check Engine) illuminated
Reduced engine performance or torque; possible limp mode
Rough idle or misfire-like symptoms
Loss of variable cam profile operation (reduced fuel economy/efficiency)
Possible increased emissions
Occasional/noise from valvetrain or hesitation during acceleration

What to check

Read and record freeze frame and live PIDs with a scan tool (camshaft position, cam actuator status, commanded vs actual)
Verify engine oil level and condition; change if contaminated or low
Visually inspect wiring and connectors at the cam profile actuator and ECM for damage, corrosion, oil intrusion, or loose pins
Check fuses/relays related to cam actuator power supply
Backprobe actuator connector while commanding actuator on/off and observe voltage/duty/ground
Measure resistance of actuator solenoid with connector disconnected

Signal parameters

Supply voltage (battery) at power pin: ~11–14.5 V with key ON/engine running (varies by vehicle)
Control signal: typically PWM 0–100% duty cycle; frequency commonly 50–300 Hz (manufacturer-specific)
Actuator/solenoid resistance (typical): ~5–30 Ω (wide manufacturer variation)
Ground continuity: near 0 Ω to chassis ground (
Actuator current draw when energized: commonly 0.2–2 A (depends on design)
Command vs actual cam position PID: commanded change within a few seconds of command (if mechanical/oil OK)

Diagnostic algorithm

Confirm and record DTC and freeze-frame data with a scan tool. Clear DTC and see if it returns.
Verify engine oil level and condition; top up or change oil if low/dirty and rescan — some actuators require clean, pressurized oil.
Visually inspect actuator, harness, and connectors for damage, oil contamination, or corrosion.
Check related fuses/relays and supply voltage to the actuator power pin with key ON and engine OFF.
Backprobe the actuator connector while commanding the actuator ON and OFF from a scan tool: verify presence of control signal (PWM or switched ground), correct supply voltage, and good ground.
With connector disconnected, measure solenoid resistance and compare to specification. Replace actuator if out of range or open circuit.
Perform continuity test between actuator control pin and ECM pin to confirm no open circuit. Wiggle harness during test to check for intermittent faults.
If wiring and actuator check good, bench-test or apply known-good 12 V to the actuator (observing polarity and safe practice) to verify proper operation (click or movement).
If actuator and wiring are good but no control signal from ECM, inspect ECM connector pins and wiring for faults. Consider swapping actuator with identical unit (if applicable) to confirm.
Repair or replace failed components (connector, wiring, actuator, fuse). Clear codes, perform relearn or camshaft adaptation procedure if required by vehicle manufacturer, then test drive and re-scan.
If problem persists after actuator and wiring replacement, consult vehicle-specific service information and consider ECM/PCM output driver diagnosis or replacement.

Likely causes

Damaged harness or disconnected connector at the actuator
Failed camshaft profile actuator (solenoid)
Corroded pin or poor ground at connector
Blown fuse or intermittent supply voltage to actuator
ECM driver fault (less common)

Fault status

⚠️ Status

P002A — B Camshaft Profile Actuator A Control Circuit/Open (Bank 1). ECM detected open or circuit fault on the cam profile actuator control circuit for camshaft B, bank 1.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0-3.0 hours