P0340
High SeverityCamshaft Position Sensor A Circuit (Bank 1)
Engine System
P0340 — Instant Answer
Camshaft Position Sensor A Circuit (Bank 1)
Severity: HIGH SEVERITY
Meaning: No signal from the camshaft position sensor on bank 1. Needed for sequential fuel injection and ignition timing.
Safe to drive? NO if CEL is flashing. YES with caution if solid, but repair this week.
Estimated repair cost: $15 - $50
Most common causes:
- 1. Failed cam sensor (35-45% of cases)
- 2. Wiring damage (10-25% of cases)
- 3. Damaged reluctor (10-25% of cases)
Symptoms
- ⚠️No start
- ⚠️Rough running
- ⚠️Loss of power
- ⚠️Check engine light
Related Symptoms
Common Causes
How to Diagnose P0340
- 1Check sensor connector
- 2Test sensor output
- 3Inspect wiring
- 4Replace sensor
OEM Procedures for P0340
Camshaft Position Sensor A Circuit (Bank 1) Found 16 OEM service manual procedures.
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Camshaft Position Sensor (2RZ-FE, 3RZ-FE) - Replacement
Showing 8 of 16 procedures
OEM Diagnostic Flowchart
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Parts & Tools for This Job
Common parts shoppers buy for P0340 Camshaft Position Sensor A Circuit (Bank 1).
Oxygen Sensor
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Spark Plugs
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Ignition Coils
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Mass Air Flow Sensor
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Fuel Injectors
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Engine Oil
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OBD2 scanner
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Check SpecificationsBattery tester
Check cranking and charging health before replacing expensive parts.
A weak battery can mimic alternator or starter problems.
Check SpecificationsMultimeter kit
Confirm voltage, continuity, and sensor power with one simple kit.
A meter is the cheapest way to rule out a bad circuit fast.
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Related Resources
Repair guides, symptom pages, and wiring diagrams related to P0340.
OEM Manual Evidence
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Related Symptoms
Browse →No-crank and no-start complaints usually resolve into battery, starter, alternator, crank sensor, or fuel-delivery diagnosis.
Rough idle often traces back to ignition, air metering, vacuum leaks, or timing-related faults before it becomes a full misfire complaint.
A check-engine light is a graph entry point into code pages, symptom-specific diagnosis, and the exact repair categories most often associated with those failures.
Exact Vehicle Hubs
Browse →Open the exact vehicle hub for a repair workflow commonly associated with P0340.
Open the exact vehicle hub for a repair workflow commonly associated with P0340.
Open the exact vehicle hub for a repair workflow commonly associated with P0340.
Open the exact vehicle hub grounded by OEM manual evidence related to P0340.
Open the exact vehicle hub grounded by OEM manual evidence related to P0340.
Open the exact vehicle hub grounded by OEM manual evidence related to P0340.
Exact Repair Workflows
Browse →Open the exact repair flow most commonly associated with P0340 on this vehicle.
Open the exact repair flow most commonly associated with P0340 on this vehicle.
Open the exact repair flow most commonly associated with P0340 on this vehicle.
Open the exact repair flow most commonly associated with P0340 on this vehicle.
Open the exact repair flow most commonly associated with P0340 on this vehicle.
Open the exact repair flow most commonly associated with P0340 on this vehicle.
Related Codes
Cam sensor signal is irregular or does not correlate with crank sensor.
The ECM is not receiving a proper signal from the crankshaft position sensor. This sensor is critical for engine timing and fuel injection.
The crankshaft and intake camshaft positions are not synchronized on bank 1. This indicates a timing problem that can cause rough running or no-start conditions.
Frequently Asked Questions
- Can a bad cam sensor cause no-start?
- On some vehicles yes — the ECM needs both cam and crank signals to start.
- Is the cam sensor easy to replace?
- Usually yes — it bolts to the cylinder head or valve cover. 15-30 minute job.
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Author & Review
Published by AllOEMManuals, founded by Lyndon Bedford, an automotive technician with 20 years of experience. He owned and operated a mechanic shop in Hurst, Texas from 2014 to 2022 and continues hands-on repair work.
Content may combine manual references, general repair templates, and AI-assisted drafting. Confirm the source, vehicle configuration, and applicability before working. Report corrections through our contact page.
Last updated: 2026-10-29