P2B47 code meaning
B Camshaft Position Actuator Position Sensor B Circuit Bank 1
Powertrain system Generic code P2Bxx codes Check engine light
What P2B47 means
P2B47 moves the circuit fault to the exhaust side: it concerns position sensor B on the actuator of camshaft B, bank 1. NTN-SNR's supplier code list reads camshaft B as the outlet camshaft. Mercedes-Benz, in its CAMTRONIC bulletin for the M176/M177 V8, documents exhaust-side feedback faults only for sensor A of solenoid 1 (P34BD, P34BE); a second exhaust sensor and P2B47 itself are not documented publicly by any manufacturer. The comparable GM L3B judges an exhaust sliding-cam feedback circuit (P2C12) as open from 200 kΩ upward, 4 of 5 samples, MIL on the first trip. Look for an unplugged or corroded connector and broken wires first. The intake-side counterpart on bank 1 is P2B3F.
P2B47 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 3 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2B47
- Check engine light on
- Exhaust cam lift change unavailable
- Little change in driving behaviour
Common causes of P2B47
- Most likelyConnector unplugged or corroded, wire broken
- PossibleExhaust actuator sensor failed
- Less likelyEngine control module fault
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
B camshaft position actuator pos sensor b b1Wiring harnessECM
What each part of P2B47 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. |
| 47 | The exact fault in that area. |
What to do next
- Note P2B47 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 P2B47
What does P2B47 mean?
P2B47 means "B Camshaft Position Actuator Position Sensor B Circuit Bank 1". P2B47 moves the circuit fault to the exhaust side: it concerns position sensor B on the actuator of camshaft B, bank 1. It is a generic code, so it means the same on every make.
Is it safe to drive with P2B47?
Drive gently and only to a workshop. With P2B47 the car can go into limp mode (reduced power) to protect itself.
Will P2B47 fail an emissions test?
Yes, it can. P2B47 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 P2B47 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3 hours of work. This is a job for a workshop.
Will P2B47 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.