Code
P002B
Generic
P — Powertrain
B Camshaft Profile Actuator A Control Circuit Low Bank 1
Views:
UK: 15
EN: 21
RU: 22
AI status
Completed
Completed
100%
Causes
- Faulty camshaft profile (B) actuator / oil control valve (OCV)
- Open or shorted wiring in the actuator control circuit (short to ground)
- Poor connector contact, corrosion or damaged terminal at the OCV or ECM
- Low engine oil level, contaminated oil or clogged oil passages causing OCV to stick
- Blown fuse or faulty power/ground supply to the circuit
- Faulty PCM/ECM or internal driver failure
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine performance, hesitation or limp-home behavior
- Rough idle or surging at low RPM
- Reduced fuel economy and increased emissions
- Possible engine noise from incorrect cam timing (ticking or unusual valvetrain sounds)
What to check
- Retrieve all stored codes and freeze frame data with a scan tool; note corroborating cam/crank codes and live data
- Check oil level, condition and service history; ensure correct oil grade and recent oil/filter change if overdue
- Perform a visual inspection of wiring and connectors at the camshaft actuator and PCM for damage, corrosion, or loose terminals
- Check fuses/relays related to the camshaft actuator circuit and PCM power/ground circuits
- Backprobe the actuator connector while monitoring live data and commanded actuator status with a scan tool
- Measure resistance of the OCV coil at the connector (with harness disconnected) and compare to specification
Signal parameters
- Typical actuator coil resistance: approximately 5–30 ohms (varies by manufacturer) — consult OEM spec
- Control signal: PWM command from PCM, duty cycle 0–100% (0% = fully off/low, 100% = fully on/high)
- Expected idle/rest voltage on control pin: near 0–1 V when commanded low; when commanded active should see PWM varying between ~0.5–12 V depending on vehicle
- PWM frequency: commonly in the range 30–300 Hz (manufacturer dependent)
- Supply voltage to actuator: ~12 V (ignition on) on the power feed; ground returned through PCM/driver
Diagnostic algorithm
- Connect a scan tool, record P002B and any related codes; note freeze frame and live data (camshaft position, commanded actuator duty).
- Verify oil level and condition; if very low or dirty, correct oil and repeat test. Replace oil/filter if contamination suspected.
- Visually inspect harness/connectors at the camshaft actuator and PCM. Repair any damage, corrosion, or poor terminals.
- Inspect related fuses and relays; replace if faulty.
- With ignition OFF, disconnect OCV and measure coil resistance between its pins; compare to OEM spec. If out of range, replace OCV.
- Check for short to ground/power: with harness connected, turn ignition ON and backprobe control wire. Using a multimeter or lab scope observe voltage while commanding actuator on/off with scan tool. If control wire stays near 0 V when it should be PWM or high, suspect short to ground or PCM driver fault.
- If resistance is OK and no short is found, use an oscilloscope to observe PWM waveform while commanding actuator. Verify correct duty changes and waveform shape. No waveform or flat low indicates driver or wiring short.
- Wiggle harness during testing to detect intermittent faults. Repair any broken wires or poor connections found.
- If wiring and OCV check good but no PWM output from PCM, check PCM grounds and power supplies. Reflash or replace PCM only after all wiring and actuator prove good and TSBs do not suggest software update.
- Clear codes and test drive to verify repair. Monitor live data for cam timing changes and absence of fault reoccurrence.
Likely causes
- Intermittent or damaged harness/connector to the camshaft actuator
- Failed or clogged oil control valve (stuck open/closed)
- Low oil pressure or dirty oil causing actuator to not move
- Short to ground in the control wire causing a constant low reading
- Less likely: ECM driver fault
Fault status
Status
Check Engine Light (MIL) on. Cam timing may be incorrect; engine may enter reduced power mode or exhibit poor performance.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email