🚨 Diagnostic Profile
Vehicle/Equipment Make: BMW
Technical Description: B Camshaft Position Actuator Control Open Circuit Bank 2
This fault code indicates that the Digital Motor Electronics (DME) module has detected an open circuit condition in the wiring or solenoid control circuit for the camshaft position actuator (VANOS solenoid) located on Bank 2 (typically the cylinder bank not containing cylinder #1). This is often caused by a wiring fault, connector corrosion, or a failed solenoid valve itself.
🚨 Repair Difficulty Tier
Difficulty Rating: Intermediate
This repair requires the use of a BMW-specific diagnostic scanner (such as ISTA/D or a comparable advanced OBD-II tool) to read live VANOS solenoid data and perform resistance testing with a multimeter. While not as complex as full module programming, it does require mechanical knowledge of engine timing components, careful handling of oil galleys, and correct torque specifications for solenoid retaining bolts. A basic home mechanic with intermediate electrical diagnostic skills and the right tools can attempt this repair.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the wiring harness and electrical connector leading to the Bank 2 camshaft position actuator (VANOS solenoid). Look for:
- Corrosion or oxidation at the connector pins
- Chafed, melted, or disconnected wiring near the valve cover or exhaust manifold
- Oil-soaked or damaged connector housings
- Confirm the solenoid is securely seated and the retaining bolt is tight
Step 2: Diagnostic Verification
Connect a BMW-capable scan tool and verify the following:
- Confirm the exact fault code and freeze frame data (engine RPM, temperature, and load at time of fault)
- Use the scanner’s live data stream to monitor Bank 2 VANOS solenoid duty cycle commands
- Disconnect the solenoid connector and use a multimeter to check resistance across the solenoid terminals (typically 6-10 ohms depending on model; consult factory spec)
- Check for continuity along the wiring harness back to the DME connector pin assignment
- Verify DME is supplying correct reference voltage (usually 12V) to the solenoid circuit when commanded
Step 3: Resolution & Reset Process
Based on diagnostic findings:
- If wiring or connector damage is found, repair or replace the affected harness section with OEM-spec wiring and dielectric-sealed connectors
- If the solenoid itself tests out of spec (open circuit, no resistance reading), replace the Bank 2 VANOS solenoid valve
- After repair, clear the fault code using the scan tool
- Perform a VANOS adaptation/reset procedure through the scan tool if supported by the vehicle’s software version
- Test drive the vehicle through varying RPM ranges to confirm the fault does not return and VANOS actuation responds correctly on live data readout
📦 Parts, Labor, and Budget Estimates
Required Components/Software:
- Bank 2 VANOS Camshaft Position Solenoid (OEM or OEM-equivalent)
- Wiring harness repair kit/connector pigtail (if needed)
- BMW-specific scan tool (ISTA/D, Autel BMW-specific adapter, or equivalent) for live data and adaptation reset
Average Component Price: $60–$150 USD for the VANOS solenoid (OEM pricing varies by model); $20–$50 USD for a wiring repair kit if needed
Estimated Labor Hours: 1.0–2.0 hours for diagnosis, solenoid replacement, and VANOS adaptation reset. Additional time (0.5–1.5 hours) may be required if wiring harness repair is necessary due to accessibility constraints on some engine layouts.