System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Cam Position Sensor Circuit
Code P0340: Camshaft Position Sensor A Circuit Bank 1 or Single Sensor
Diagnostic & Technical Explanation
Code P0340 (Camshaft Position Sensor A Circuit Bank 1 or Single Sensor) sets when the ECM sees an open circuit, out-of-range voltage, or an erratic signal from the primary camshaft position sensor used for cylinder identification and cam-to-crank correlation — distinct from a VVT phaser's own actuator-position feedback sensor. Common causes are a corroded connector, a worn or contaminated reluctor/trigger wheel on the camshaft, an incorrect air gap, or chafed wiring between the sensor and the ECM.
First-listed procedure
Rank #1
Inspect and reseat the camshaft position sensor connector
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 3 procedure(s) are in the licensed dataset. Ordering context.
Full family: Cam Position Sensor Circuit
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)