Block of codes
P34xx codes: cylinder deactivation and camshaft actuators
This block brings together the codes from P3400 to P34C8 in the glossary. Open yours to see what it means, its causes and whether you can keep driving.
Reviewed by Daniel Morales, founder of Reprorace SL, on
What this block covers
Engine (mechanical, cooling and lubrication)
The engine's mechanics, timing (camshaft and crankshaft), cooling and lubrication. Many of these codes check that the engine is in time and at the right temperature.
The 78 codes of the block
- P3400Cylinder deactivation system (bank 1): malfunction
- P3401Cylinder 1 deactivation/intake valve, control circuit open
- P3402Cylinder 1 deactivation/intake valve, control circuit: performance
- P3403Cylinder 1 deactivation/intake valve, control circuit: signal low
- P3404Cylinder 1 deactivation/intake valve, control circuit: signal high
- P3405Cylinder 1 exhaust valve, control circuit open
- P3408Cylinder 1 exhaust valve, control circuit: signal high
- P3409Cylinder 2 deactivation/intake valve, control circuit open
- P340ADeactivation/intake valve (bank 1), control circuit: malfunction
- P340BDeactivation/intake valve (bank 2), control circuit: malfunction
- P340CDeactivation/exhaust valve (bank 1), control circuit: malfunction
- P340DDeactivation/exhaust valve (bank 2), control circuit: malfunction
- P3412Cylinder 2 deactivation/intake valve, control circuit: signal high
- P3414Cylinder 2 exhaust valve, control circuit: performance
- P3415Cylinder 2 exhaust valve, control circuit: signal low
- P3416Cylinder 2 exhaust valve, control circuit: signal high
- P3417Cylinder 3 deactivation/intake valve, control circuit open
- P3418Cylinder 3 deactivation/intake valve, control circuit: performance
- P3419Cylinder 3 deactivation/intake valve, control circuit: signal low
- P341ADeactivation/intake valve (bank 1), control circuit: performance
- P341BDeactivation/intake valve (bank 2), control circuit: performance
- P341CDeactivation/exhaust valve (bank 1), control circuit: performance
- P341DDeactivation/exhaust valve (bank 2), control circuit: performance
- P3420Cylinder 3 deactivation/intake valve, control circuit: signal high
- P3421Cylinder 3 exhaust valve, control circuit open
- P3422Cylinder 3 exhaust valve, control circuit: performance
- P3423Cylinder 3 exhaust valve, control circuit: signal low
- P3424Cylinder 3 exhaust valve, control circuit: signal high
- P3425Cylinder 4 deactivation/intake valve, control circuit open
- P3426Cylinder 4 deactivation/intake valve, control circuit: performance
- P3427Cylinder 4 deactivation/intake valve, control circuit: signal low
- P3428Cylinder 4 deactivation/intake valve, control circuit: signal high
- P3429Cylinder 4 exhaust valve, control circuit open
- P3430Cylinder 4 exhaust valve, control circuit: performance
- P3431Cylinder 4 exhaust valve, control circuit: signal low
- P3432Cylinder 4 exhaust valve, control circuit: signal high
- P3497Cylinder deactivation system (bank 2): malfunction
- P3498Cylinder 1 deactivation/intake valve: performance
- P3499Cylinder 2 deactivation/intake valve: performance
- P349ACylinder 3 deactivation/intake valve: performance
- P349BCylinder 4 deactivation/intake valve: performance
- P34A4A camshaft position actuator temperature sensor (bank 1), circuit: malfunction
- P34A5A camshaft position actuator temperature sensor (bank 1): range/performance
- P34A6A camshaft position actuator temperature sensor (bank 1), circuit: signal low
- P34A7A camshaft position actuator temperature sensor (bank 1), circuit: signal high
- P34A8A camshaft position actuator temperature sensor (bank 2), circuit: malfunction
- P34A9A camshaft position actuator temperature sensor (bank 2): range/performance
- P34AAA camshaft position actuator temperature sensor (bank 2), circuit: signal low
- P34ABA camshaft position actuator temperature sensor (bank 2), circuit: signal high
- P34ACA camshaft position actuator position sensor A (bank 1), circuit: malfunction
- P34ADA camshaft position actuator position sensor A (bank 1): range/performance
- P34AEA camshaft position actuator position sensor A (bank 1), circuit: signal low
- P34AFA camshaft position actuator position sensor A (bank 1), circuit: signal high
- P34B0A camshaft position actuator position sensor A (bank 2), circuit: malfunction
- P34B1A camshaft position actuator position sensor A (bank 2): range/performance
- P34B2A camshaft position actuator position sensor A (bank 2), circuit: signal low
- P34B3A camshaft position actuator position sensor A (bank 2), circuit: signal high
- P34B4B camshaft position actuator temperature sensor (bank 1), circuit: malfunction
- P34B5B camshaft position actuator temperature sensor (bank 1): range/performance
- P34B6B camshaft position actuator temperature sensor (bank 1), circuit: signal low
- P34B7B camshaft position actuator temperature sensor (bank 1), circuit: signal high
- P34B8B camshaft position actuator temperature sensor (bank 2), circuit: malfunction
- P34B9B camshaft position actuator temperature sensor (bank 2): range/performance
- P34BAB camshaft position actuator temperature sensor (bank 2), circuit: signal low
- P34BBB camshaft position actuator temperature sensor (bank 2), circuit: signal high
- P34BCB camshaft position actuator position sensor A (bank 1), circuit: malfunction
- P34BDB camshaft position actuator position sensor A (bank 1): range/performance
- P34BEB camshaft position actuator position sensor A (bank 1), circuit: signal low
- P34BFB camshaft position actuator position sensor A (bank 1), circuit: signal high
- P34C0B camshaft position actuator position sensor A (bank 2), circuit: malfunction
- P34C1B camshaft position actuator position sensor A (bank 2): range/performance
- P34C2B camshaft position actuator position sensor A (bank 2), circuit: signal low
- P34C3B camshaft position actuator position sensor A (bank 2), circuit: signal high
- P34C4A camshaft position actuator control circuit driver current/temperature (bank 1): too high
- P34C5A camshaft position actuator control circuit driver current/temperature (bank 2): too high
- P34C6B camshaft position actuator control circuit driver current/temperature (bank 1): too high
- P34C7B camshaft position actuator control circuit driver current/temperature (bank 2): too high
- P34C8Camshaft position control module: performance
Other blocks
Read your car's fault codes on your phone
With an ECO-LITE in the OBD socket you see the codes in your account, with the data captured when the fault happened, and your workshop can check them remotely, always with your permission.
Keep reading
- OBD fault codes: what each one means
- Check engine light on: what to do
- How to read and clear your car's fault codes
- Will your car pass its MOT or inspection with the engine light on?
- Wi-Fi OBD2 reader: which one to choose
- Reading fault codes by car make
- Remote OBD diagnostics: what it is, how it works and what it can't do
- Vehicle diagnostics glossary