P1325–P1332 Cylinder 1 Knock Control: Limit Attained
The ECU has logged a fault on P1325. The definition below is the exact wording the standard uses for this code.
Can you drive it? This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.
Which code is which
Same fault, different cylinder or bank — diagnosed the same way. Several set together usually means one shared cause.
| Code | Definition | Severity |
|---|---|---|
P1325 | Cylinder 1 Knock Control: Limit Attained | Do not keep driving |
P1326 | Cylinder 2 Knock Control: Limit Attained | Do not keep driving |
P1327 | Cylinder 3 Knock Control: Limit Attained | Do not keep driving |
P1328 | Cylinder 4 Knock Control: Limit Attained | Do not keep driving |
P1329 | Cylinder 5 Knock Control: Limit Attained | Do not keep driving |
P1330 | Cylinder 6 Knock Control: Limit Attained | Do not keep driving |
P1331 | Cylinder 7 Knock Control: Limit Attained | Do not keep driving |
P1332 | Cylinder 8 Knock Control: Limit Attained | Do not keep driving |
The definition
P1325: Cylinder 1 Knock Control: Limit Attained.
P1325 is a manufacturer-specific powertrain code (the engine or gearbox). Its meaning is set by the carmaker rather than by the SAE standard, so a generic OBD-II reader will often show it as an unknown code or misread it.
What to check first
Cheapest and fastest checks first:
- Read the freeze-frame data stored with the fault - engine speed, load and temperature at the moment it logged tell you whether this happens cold, hot or under load.
- Check the connector at the part for corrosion, and that it is fully seated.
- Clear the code and see whether it returns, and under what conditions.
Reading the code is the easy part
A code names the circuit that complained. What tells you why is watching the sensor behind it while the engine runs — and that is where a code reader stops and a diagnostic tool starts.
VAGPULSE reads every module in a VW, Audi, Skoda or SEAT — not just the engine — shows the live measuring blocks behind this fault, gives you the freeze-frame conditions it was logged under, and clears it once you have fixed it. It also does what a generic OBD reader cannot on a VAG: service resets, coding, adaptations, and Stage 1–3 flashing with your original file saved first.
$249 once. No subscription, unlimited cars. Windows 10/11.
See VAGPULSE — $249 Look up another codeSoftware downloads instantly · cable ships September 30 · cable guarantee — refund if it won't connect
Prefer to work on your phone? The VAGPULSE Android app is a free download and its demo mode runs against a sample car with no hardware at all, so you can see exactly what it reads before spending anything. Reading your car with it needs the VAGPULSE cable, which comes with the licence.
Common questions
What does P1325 mean?
P1325 means Cylinder 1 Knock Control: Limit Attained. It is logged when the ECU sees this circuit outside its expected operating window.
Can I drive with P1325?
This class of fault can cause real mechanical damage if you keep driving on it. A persistent misfire also destroys the catalytic converter, which is the expensive part.