P03F1: B Camshaft Profile Actuator C Control Circuit/Open (Bank 1)

What it means

The drive circuit for cam profile actuator B in position C on bank 1 is open. Three-stage cam profile systems use a separate control valve per profile position.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The Bank 1 camshaft profile actuator B has a separate drive circuit for position C, which selects that cam profile. This code sets when the module detects an open in actuator B's position C circuit, so that actuator may not engage profile C when commanded.

Common causes

Most likely first.

1. Solenoid winding open
2. Pin pushed back out of connector body
3. Cracked solder joint inside the module or sensor

Symptoms

• Check engine light on
• Power loss especially in mid-rpm range
• Possible rough idle or stalling
• Increased fuel consumption

How to diagnose it

1. Review freeze-frame and command data to verify the fault occurs when Bank 1 actuator B position C is requested.
2. Inspect actuator B's position C connector for a pushed-back terminal, corrosion, or a poor fit.
3. Check the position C solenoid winding for an open using the manufacturer's specification.
4. Test continuity through the actuator B position C harness to the control module, following the wiring diagram and safe isolation procedure.
5. If the solenoid and harness pass, inspect the relevant module or sensor assembly for an internal cracked connection.

Common fixes

• Reseat or replace a pushed-back or damaged actuator B position C terminal.
• Repair an open wire in the Bank 1 actuator B position C circuit.
• Replace the position C solenoid if its winding is confirmed open.
• Repair or replace the module or sensor assembly if an internal open connection is found.

Can I keep driving?

A gentle drive may be possible if the engine remains stable, but actuator B may not select profile C and power can be reduced. Stop if rough running or stalling occurs.