P0263 on Chevrolet
Cylinder 1 Contribution/Balance
P0263 on Chevrolet vehicles indicates cylinder 1 contribution/balance. Au7o has documented this code across 1 Chevrolet model — most commonly on Silverado 2500HD. This code means the engine computer has detected a contribution or balance problem on cylinder 1, indicating that this cylinder is producing more or less power than the others. The computer monitors tiny speed changes from each cylinder's firing event and flags one that is contributing unevenly. It points to a fueling, compression, or mechanical imbalance specific to cylinder 1 (and, on some diesels, a related fuel injector circuit). You may notice rough idle, a misfire feel, or reduced power. Typical repair costs on Chevrolet range from $1,500 to $4,000, depending on the specific model and root cause.
Common Causes of P0263
- •Faulty fuel injector on cylinder 1
- •Clogged or leaking cylinder 1 injector
- •Low compression in cylinder 1 (valves, rings, head gasket)
- •Worn or fouled spark plug / coil on cylinder 1 (gas engines)
- •Injector wiring or connector fault on cylinder 1
- •Vacuum or intake leak affecting that cylinder
- •Carbon buildup or sticking valve on cylinder 1
P0263 on Chevrolet by Model
Chevrolet Silverado 2500HD(1 issue)
- Duramax Diesel Injector Failure2001-2015
Bosch fuel injectors on early Duramax engines develop internal leaks causing rough running, white smoke, and hard starts. LB7 generation (2001-2004) most affected with class action settlement history.
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View P0263 across all makes →Frequently Asked Questions
What does P0263 mean on Chevrolet?▼
P0263 stands for "Cylinder 1 Contribution/Balance." This code means the engine computer has detected a contribution or balance problem on cylinder 1, indicating that this cylinder is producing more or less power than the others. The computer monitors tiny speed changes from each cylinder's firing event and flags one that is contributing unevenly. It points to a fueling, compression, or mechanical imbalance specific to cylinder 1 (and, on some diesels, a related fuel injector circuit). You may notice rough idle, a misfire feel, or reduced power. On Chevrolet specifically, this code is documented across 1 model.
What causes P0263 on Chevrolet vehicles?▼
Common causes on Chevrolet: Faulty fuel injector on cylinder 1, Clogged or leaking cylinder 1 injector, Low compression in cylinder 1 (valves, rings, head gasket), Worn or fouled spark plug / coil on cylinder 1 (gas engines), Injector wiring or connector fault on cylinder 1. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0263 on a Chevrolet?▼
Repair costs on Chevrolet range from $1,500 to $4,000, depending on the specific model and root cause.
Which Chevrolet models have P0263 documented?▼
Au7o has documented P0263 on 1 Chevrolet model: Silverado 2500HD.