P001A
A Camshaft Profile Actuator A Control Circuit/Open Bank 1
Open circuit at the camshaft profile actuator (intake, profile A, bank 1). Used by systems with discrete cam-lift levels (e.g. BMW Valvetronic, Honda VTEC, Audi AVS) — the actuator that selects the lift profile cannot be driven.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: medium
Symptoms
- Check engine light on
- Power loss especially in mid-rpm range
- Possible rough idle or stalling
- Increased fuel consumption
Common causes
Ordered by how often each turns out to be the cause.
- Wiring break or unplugged connectorCommon
- Actuator coil openPossible
- Pin pushed back out of connector bodyLess likely
Parts involved
- Cam Profile Actuator
- Actuator Wiring
- Actuator Connector
P001A is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.