OBD-II code · Powertrain (generic)
P034A Crankshaft Position Sensor - Crankshaft Start Position Incorrect
At engine start the crankshaft position reported by the sensor does not match the calibrated start window — typically a wrong tone-wheel installation, sensor air gap, or PCM not synchronised after a relearn.
Is it safe to drive with P034A?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyTone wheel misindexed or relearn pending
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–4 h
- Emissions test
- Likely to fail
- Parts involved
- Crankshaft Position Sensor, Flywheel
Related codes
- P0347Camshaft Position Sensor A Circuit Low (Bank 2)
- P0348Camshaft Position Sensor A Circuit High (Bank 2)
- P0349Camshaft Position Sensor A Circuit Intermittent (Bank 2)
- P034BCrankshaft Position Sensor - Crankshaft Direction Incorrect
- P034CIon Sense System Performance
- P0350Ignition Coil Primary/Secondary Circuit/Open
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.