P0263 on Ford
Cylinder 1 Contribution/Balance
P0263 on Ford vehicles indicates cylinder 1 contribution/balance. Au7o has documented this code across 2 Ford models — most commonly on F-250 Super Duty, F-350. 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 Ford range from $900 to $5,000, 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 Ford by Model
Ford F-250 Super Duty(1 issue)
- 6.0L Power Stroke HEUI Injector Stiction - Spool Valve Sticking on Cold Start2003-2007
Each 6.0L HEUI injector contains two spool valves actuated by high-pressure engine oil. Oil varnish, coking and wear cause the spool to stick - 'stiction' - so the injector cannot respond to the FICM's command quickly enough. The signature is unmistakable to owners: a hard cold start followed by a shaking, misfiring, smoky idle for the first few minutes that disappears once the oil warms and thins. Cylinder contribution and injector on-time data will show one or more cylinders far out of range. Extended oil change intervals and the wrong oil grade accelerate it, and the 6.0's oil is doing double duty as hydraulic fluid, which is why oil quality matters far more here than on a conventional diesel.
Ford F-350(1 issue)
- 6.0L HEUI Injector Stiction - Cold-Start Misfire from Varnished Spool Valves2003-2007
The 6.0L Power Stroke uses hydraulically actuated, electronically controlled unit injectors (HEUI) that are fired by high-pressure engine oil. Oxidized oil leaves a varnish film on the injector spool valve, and when the engine is cold that film creates static friction (stiction) that keeps the spool from moving on command. The result is a dead or lazy cylinder for the first minutes after a cold start, clearing as oil warms. Owners report a rough, shaking cold start that smooths out after several miles and then progressively worsens over months until the injector fails outright. Extended oil-change intervals, low-quality oil and short-trip use all accelerate it. This is an oil-side failure mode of the HEUI system and does not apply to the 6.4L or 6.7L, which use common rail.
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View P0263 across all makes →Frequently Asked Questions
What does P0263 mean on Ford?▼
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 Ford specifically, this code is documented across 2 models.
What causes P0263 on Ford vehicles?▼
Common causes on Ford: 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 Ford?▼
Repair costs on Ford range from $900 to $5,000, depending on the specific model and root cause.
Which Ford models have P0263 documented?▼
Au7o has documented P0263 on 2 Ford models: F-250 Super Duty, F-350.