P34B2 code meaning
A Camshaft Position Actuator Position Sensor A Circuit Low Bank 2
Powertrain system Generic code P34xx codes Check engine light
What P34B2 means
P34B2 is set when position sensor A on the intake phaser of bank 2 delivers a voltage below its permitted window. Public manufacturer information on this code is lacking. On the 2022 Mitsubishi Outlander the bank 1 version P34AE is evaluated by the electric valve timing module and traced to the actuator circuit or the actuator. Mercedes calls the corresponding low code of its CAMTRONIC exhaust sensors on bank 2 (P34C2) a ground short and, in bulletin LI05.20-P-080192, has the engine harness by the bulkhead inspected for scorching. A grounded signal wire, a missing sensor supply or a shorted sensor are therefore the first things to rule out on bank 2. High is P34B3, bank 1 P34AE.
P34B2 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 P34B2
- Check engine light on
- Bank 2 intake phasing switched off
- Possibly codes from other sensors on the same supply
Common causes of P34B2
- Most likelySignal wire grounded, harness heat-damaged
- PossibleSensor supply interrupted
- PossibleSensor in the actuator shorted
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Cam actuator a pos sensor b2Sensor wiring
What each part of P34B2 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 3 | Mixed range: generic and manufacturer-specific codes. |
| 4 | Area: auxiliary emission controls (catalytic converter, EGR, EVAP). |
| B2 | The exact fault in that area. |
What to do next
- Note P34B2 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 P34B2
What does P34B2 mean?
P34B2 means "A Camshaft Position Actuator Position Sensor A Circuit Low Bank 2". P34B2 is set when position sensor A on the intake phaser of bank 2 delivers a voltage below its permitted window. It is a generic code, so it means the same on every make.
Is it safe to drive with P34B2?
Drive gently and only to a workshop. With P34B2 the car can go into limp mode (reduced power) to protect itself.
Will P34B2 fail an emissions test?
Yes, it can. P34B2 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 P34B2 to fix?
Difficulty: medium. A typical repair takes 0.5 to 3.5 hours of work. This is a job for a workshop.
Will P34B2 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.