P0263 — Cylinder 1 contribution/balance out of range
| Meaning | The ECU compares how much work each cylinder does and finds the first one is not pulling its weight. On common rail engines this is the code that leads to injector diagnosis. |
| Family | Powertrain (P) |
Typical symptoms
Knocking noise from the injection
Power loss
Smoke from the exhaust
Higher consumption
Common causes
IMA/IQA injector code not updated after a replacement
Low compression on that cylinder
Leak from the injector return
What to do
Frequently asked questions
What does code P0263 mean?
Cylinder 1 contribution/balance out of range. The ECU compares how much work each cylinder does and finds the first one is not pulling its weight. On common rail engines this is the code that leads to injector diagnosis.
Can I keep driving with code P0263 active?
With caution: limp mode possible, have it checked soon
Common causes — P0263
Worn injector or delivery out of specification IMA/IQA injector code not updated after a replacement Low compression on that cylinder Leak from the injector return
How do you fix code P0263?
Measure each injector's return and read per-cylinder corrections on the diagnostic tool: together they tell whether the injector needs reconditioning. If an injector was replaced recently, check first that its calibration code was written into the ECU — it is often forgotten.
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Contact usRelated codes
- P0200 — Injector Circuit Malfunction
- P0201 — Injector cylinder 1: circuit
- P0202 — Injector Circuit Malfunction - Cylinder 2
- P0203 — Injector Circuit Malfunction - Cylinder 3
- P0204 — Injector Circuit Malfunction - Cylinder 4
- P0205 — Injector Circuit Malfunction - Cylinder 5
- P0206 — Injector Circuit Malfunction - Cylinder 6
- P0207 — Injector Circuit Malfunction - Cylinder 7
- P0208 — Injector Circuit Malfunction - Cylinder 8
- P0209 — Injector Circuit Malfunction - Cylinder 9
- P020A — FUEL INJECTOR 1 PERFORMANCE
- P020B — FUEL INJECTOR 2 PERFORMANCE