Normal completion of the ECM self-test after enough drive cycles, which is the intended trigger.; Recent battery replacement or ECM memory clear followed by a full monitor run.; A scan tool or code reader that reports pass codes alongside fault codes.; An emissions inspection workflow that reads readiness status and logs P1111.; A previous repair that cleared faults and allowed monitors to pass again.; Incorrect interpretation of P1111 as a fault by a generic code reader.

DTC codes / Jaguar codes / P1111

P1111 · JaguarSystem Pass

Q: What does code P1111 mean?

System Pass. P1111 is Jaguar's stored confirmation that the engine control module (ECM) has completed its full self-test sequence and all monitored emissions systems passed without a fault. The ECM sets this code only after the required drive cycles are finished and every readiness monitor reports complete and successful, so it is a pass result rather than a failure.

P1111 is Jaguar's stored confirmation that the engine control module (ECM) has completed its full self-test sequence and all monitored emissions systems passed without a fault. The ECM sets this code only after the required drive cycles are finished and every readiness monitor reports complete and successful, so it is a pass result rather than a failure.

SystemPowertrain

Code typeJaguar specific

SeverityLow

Fix difficultyDIY

AreaFuel and air metering

Symptoms you may notice

No drivability symptoms at all, because the code records a successful self-test.
The malfunction indicator lamp (MIL) is off and stays off during normal driving.
All emissions readiness monitors show complete on a scan tool.
The code may appear after a battery disconnect or ECM reset once monitors finish running.
No pending or stored fault codes accompany P1111 on a healthy vehicle.

Common causes, most likely first

Normal completion of the ECM self-test after enough drive cycles, which is the intended trigger.
Recent battery replacement or ECM memory clear followed by a full monitor run.
A scan tool or code reader that reports pass codes alongside fault codes.
An emissions inspection workflow that reads readiness status and logs P1111.
A previous repair that cleared faults and allowed monitors to pass again.
Incorrect interpretation of P1111 as a fault by a generic code reader.

How to diagnose and fix it

Confirm the code with a Jaguar-compatible scan tool and check that no other fault codes are stored or pending.
Verify all readiness monitors are complete and that the MIL is off.
Review recent service history for battery disconnects, ECM resets, or emissions-related repairs.
Clear the code only if the vehicle owner wants a clean scan report, then recheck after a full drive cycle.
If any monitor is incomplete, perform the Jaguar drive cycle for that monitor and recheck.
If other codes appear alongside P1111, diagnose those faults first because P1111 itself requires no repair.

What P1111 really tells you on a Jaguar

P1111 is a pass code, so replacing parts to 'fix' it wastes money and can introduce new faults.
Generic OBD-II readers often hide or mislabel manufacturer pass codes, so use Jaguar-specific software to confirm.
The code can reappear after every successful monitor run, which is normal and not a sign of a recurring problem.
An emissions test station may record P1111 as part of readiness documentation even when the car is healthy.
If P1111 is stored together with a fault code, treat the other code as the real problem and ignore P1111.

Can I keep driving with P1111?

P1111 confirms the engine self-test passed, so the vehicle is safe to drive normally with no restrictions. No repair is needed unless another fault code is stored alongside it.

Tools that help

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Guidance is general and written for Jaguar vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.