Cam actuator B position sensor on bank 2 signal voltage above expected range. The camshaft position sensor identifies which cylinder is on the compression stroke — without it the ECM cannot run sequential injection or coil-on-plug ignition correctly.
Medium severity. Can I keep driving?Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
Bank 2 is the side without cylinder 1, so it only exists on V or boxer engines.
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Most likely causes
- Signal wire open
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
What to check, in order
Start with the simplest. You can tick off each step.
Good to know
- Repair difficulty: medium
- It affects emissions.
What each character of P34C3 means
- P: Powertrain: engine and transmission
- 3: Generic or manufacturer code, depending on the range
- 4: Emissions
- C3: Specific fault in that system
Frequently asked questions
Can I keep driving with code P34C3?
Drive little and gently. If you hear timing chain noise or the oil light comes on, shut off the engine.
What causes code P34C3?
The most common causes are: signal wire open; connector pins corroded - high contact resistance; supply wire pinched against B+ source.
Related codes
- P34BFB Camshaft Position Actuator Position Sensor A Circuit High Bank 1
- P34B3A Camshaft Position Actuator Position Sensor A Circuit High Bank 2
- P34AFA Camshaft Position Actuator Position Sensor A Circuit High Bank 1
- P2B4EB Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- P2B4AB Camshaft Position Actuator Position Sensor B Circuit High Bank 1
- P2B46A Camshaft Position Actuator Position Sensor B Circuit High Bank 2
- P2B42A Camshaft Position Actuator Position Sensor B Circuit High Bank 1
Sources
Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.