P3400 on Chevrolet
Cylinder Deactivation System Bank 1
P3400 on Chevrolet vehicles indicates cylinder deactivation system bank 1. Au7o has documented this code across 1 Chevrolet model — most commonly on Camaro. This code indicates the engine control module detected a fault in the cylinder deactivation (variable displacement) system on bank 1, the side of the engine containing cylinder number one. Cylinder deactivation closes the valves and cuts fuel to certain cylinders under light load to save fuel, using oil-pressure-operated control solenoids. When the system can't operate correctly, the module sets this code; you may notice reduced fuel economy, a slight performance change, or a warning light. The most common trigger is low oil level or poor oil pressure. Typical repair costs on Chevrolet range from $1,800 to $4,500, depending on the specific model and root cause.
Common Causes of P3400
- •Low engine oil level or low oil pressure
- •Clogged or dirty oil passages/lifters
- •Faulty active fuel management / cylinder deactivation solenoid
- •Failed deactivating lifter or collapsed lifter
- •Wiring or connector fault in the solenoid circuit
- •Sludge from missed oil changes
- •Faulty oil pressure sensor
P3400 on Chevrolet by Model
Chevrolet Camaro(1 issue)
- L99 AFM Lifter Failure and Camshaft Damage on 6.2L Automatic Cars2010-2015
Automatic-transmission SS models with the 6.2L L99 V8 use Active Fuel Management lifters that are widely reported to collapse or stick, often leading to a misfire, valvetrain noise, and in many cases camshaft lobe damage. This problem is heavily documented across GM AFM-equipped V8 platforms and appears in Camaro owner complaints and forum repair threads. Repairs can become expensive because the cylinder heads and valvetrain must be opened, and many owners replace the cam and full lifter set once failure begins.
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What does P3400 mean on Chevrolet?▼
P3400 stands for "Cylinder Deactivation System Bank 1." This code indicates the engine control module detected a fault in the cylinder deactivation (variable displacement) system on bank 1, the side of the engine containing cylinder number one. Cylinder deactivation closes the valves and cuts fuel to certain cylinders under light load to save fuel, using oil-pressure-operated control solenoids. When the system can't operate correctly, the module sets this code; you may notice reduced fuel economy, a slight performance change, or a warning light. The most common trigger is low oil level or poor oil pressure. On Chevrolet specifically, this code is documented across 1 model.
What causes P3400 on Chevrolet vehicles?▼
Common causes on Chevrolet: Low engine oil level or low oil pressure, Clogged or dirty oil passages/lifters, Faulty active fuel management / cylinder deactivation solenoid, Failed deactivating lifter or collapsed lifter, Wiring or connector fault in the solenoid circuit. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P3400 on a Chevrolet?▼
Repair costs on Chevrolet range from $1,800 to $4,500, depending on the specific model and root cause.
Which Chevrolet models have P3400 documented?▼
Au7o has documented P3400 on 1 Chevrolet model: Camaro.