P0340: Camshaft Position Sensor A Circuit Malfunction (Bank 1 or Single Sensor)
The engine computer isn't getting a usable signal from the camshaft position sensor.
Green, yellow, red: three ways P0340 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Starts fine, code set once.
Schedule a repair
Long cranking or occasional stall. Replace the sensor soon.
Stop and get help
No-start or stalling while driving. Don't drive.
Symptoms you might notice
- Long cranking before start
- Stalling
- Rough running
Common causes, cheapest first
- Failed camshaft sensor
- Wiring or connector problem
- Timing chain or belt jumped
What you can check before calling
- Note longer cranking than usual
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More cam & crank timing codes
- P0011
Camshaft Position A Timing Over-Advanced or System Performance (Bank 1) - P0012
Camshaft Position A Timing Over-Retarded (Bank 1) - P0014
Camshaft Position B Timing Over-Advanced or System Performance (Bank 1) - P0017
Crankshaft Position / Camshaft Position Correlation (Bank 1 Sensor B) - P0008
Engine Position System Performance (Bank 1) - P0010
Intake Camshaft Position Actuator Circuit (Bank 1)
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0340 mean?
P0340 means "Camshaft Position Sensor A Circuit Malfunction (Bank 1 or Single Sensor)". The engine computer isn't getting a usable signal from the camshaft position sensor.
Can I drive with code P0340?
It depends on what the vehicle is doing. Green: Starts fine, code set once. Yellow: Long cranking or occasional stall. Replace the sensor soon. Red: No-start or stalling while driving. Don't drive.
What causes P0340?
The most common causes are: failed camshaft sensor; wiring or connector problem; timing chain or belt jumped.
Is P0340 a serious code?
It can be. No-start or stalling while driving. Don't drive.
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