P2B35

Code

Generic P — Powertrain

A Camshaft Profile Actuator B Control Circuit High Bank 1

Brand: Generic

Type: P — Powertrain

Views: UK: 21 EN: 33 RU: 23

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Page language: EN

Causes

Short to battery voltage on the actuator control circuit
Faulty camshaft profile actuator (VVT/solenoid) B on Bank 1
Open or damaged wiring/connectors (pins shorted, chafing)
Poor or corroded connector or terminal at the actuator
Poor ground or power supply issue
PCM/ECM internal fault or failed driver transistor

Symptoms

Malfunction indicator lamp (MIL) illuminated
Reduced engine performance or reduced torque
Rough idle or surging if cam timing is uncontrolled
Ticking or unusual valvetrain noise if actuator stuck
Decreased fuel economy
Possible limp-home mode with reduced drivability

What to check

Read freeze frame and any pending/related codes; note engine conditions when code set
Inspect wiring harness and connector at camshaft profile actuator B (Bank 1) for damage, corrosion, or pin pushed out
Check engine oil level and condition (dirty or low oil can affect mechanical operation)
Check for aftermarket devices or recent repairs in the camshaft actuator wiring
Backprobe the actuator connector to verify supply voltage and control signal with key ON and engine running
Measure coil resistance and continuity between actuator terminals and to ground

Signal parameters

Supply voltage (key ON): ~11–14 V at actuator power feed
Control signal: PCM typically pulses (PWM) the actuator with voltage between 0–12 V; duty cycle varies 0–100% depending on commanded position
Expected coil resistance (typical range for solenoids): roughly 6–40 ohms (varies by design) — consult OEM spec when possible
PWM frequency: commonly tens to a few hundred Hz depending on manufacturer
When commanded OFF: control circuit should not be held at a high steady voltage by the PCM driver

Diagnostic algorithm

Retrieve and record diagnostic trouble code(s) and freeze-frame data. Note engine oil temperature, RPM, and other conditions.
Perform a visual inspection of the actuator wiring and connector for damage, corrosion, or signs of overheating. Repair any obvious damage before further testing.
Check engine oil level and condition; correct oil issues and retest if oil was very low or contaminated.
With ignition ON (engine OFF), measure battery voltage at the actuator power pin to verify proper supply (should be battery voltage).
Backprobe the control/driver pin at the actuator with engine running or while commanding the actuator (use a scan tool to command if available). Observe voltage/waveform: look for an abnormal high DC voltage, stuck-high, or no switching.
Measure actuator coil resistance with the connector unplugged. Compare to manufacturer spec or a known-good value. A very low resistance may indicate an internal short.
Perform continuity checks between the actuator connector and PCM to look for shorts to battery or open circuits. Check for short to ignition power or other circuits.
Wiggle the harness and connectors while monitoring the signal to check for intermittent faults.
If wiring and connector are good and actuator resistance is within spec, substitute a known-good actuator or carefully bench-test the suspect actuator to confirm operation.
If a replacement actuator does not clear the code, test the PCM driver output for shorts or replace PCM only after ruling out wiring and actuator faults; consult OEM procedures before replacing ECM/PCM.
After repairs, clear codes and perform a road test or actuation test with a scan tool to confirm the fault does not return.

Likely causes

Damaged wiring shorted to battery voltage at the actuator connector
Failed actuator coil with internal short/high leakage
Corroded/loose connector causing intermittent high voltage reading
PCM output stage failure (less common but possible)

Fault status

⚠️ Status

Camshaft Profile Actuator B Control Circuit High (Bank 1) — PCM detected higher-than-expected voltage on the actuator control circuit. Possible wiring short to battery, bad actuator, poor connector, or PCM driver fault.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1.0 - 3.0 hours