P2B43 A Camshaft Position Actuator Position Sensor B Circuit Bank 2

P2B43 covers the wiring of sensor B at the bank 2 intake actuator, i.e. on the cylinder bank without cylinder 1, so it only appears on V or boxer engines. The engine module sees an open line or a signal it cannot accept at all. On Mercedes V8s with CAMTRONIC (M176/M177) the intake actuator of bank 2 is exactly where bulletin LI05.20-P-080192 places the sister fault P2B44; the same bulletin asks technicians to check the harness above the bulkhead for heat damage, which fits a circuit code as well. P2B43 itself is not described in any public manufacturer document. CARB demands that every sensor of a variable valve system is monitored for circuit faults. Bank 1 counterpart: P2B3F.

Likely causes

Symptoms

• Check engine light on
• Cylinder deactivation or lift change switched off
• Possibly limp-home message of the valve-lift system

Repair estimate

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

Related codes

References: law.cornell.edu, ntn-snr.com, static.nhtsa.gov.