P2B43 code meaning
A Camshaft Position Actuator Position Sensor B Circuit Bank 2
Powertrain system Generic code P2Bxx codes Check engine light
What P2B43 means
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.
P2B43 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2B43
- Check engine light on
- Cylinder deactivation or lift change switched off
- Possibly limp-home message of the valve-lift system
Common causes of P2B43
- Most likelyHarness near the bulkhead damaged by heat
- PossibleActuator connector loose or corroded
- PossibleSensor in the actuator failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
A camshaft position actuator pos sensor b b2Wiring harnessECM
What each part of P2B43 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| B | Area: hybrid propulsion. |
| 43 | The exact fault in that area. |
What to do next
- Note P2B43 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2B43
What does P2B43 mean?
P2B43 means "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. It is a generic code, so it means the same on every make.
Is it safe to drive with P2B43?
Drive gently and only to a workshop. With P2B43 the car can go into limp mode (reduced power) to protect itself.
Will P2B43 fail an emissions test?
Yes, it can. P2B43 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2B43 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3.5 hours of work. This is a job for a workshop.
Will P2B43 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.