Failed cylinder 2 fuel injector (open or shorted internal coil); Damaged or corroded injector harness connector at cylinder 2; Broken, chafed, or shorted wire in the injector circuit between the ECM and injector; Poor electrical connection at the ECM connector for the injector driver; Internal ECM driver failure for the cylinder 2 injector circuit (rare but possible); Rodent damage or heat-related insulation breakdown on the injector wiring

DTC codes / Jaguar codes / P1202

P1202 · JaguarCylinder 2 Injector Circuit Open/Shorted

Q: What does code P1202 mean?

Cylinder 2 Injector Circuit Open/Shorted. P1202 on a Jaguar means the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 2's fuel injector. The ECM monitors injector current and flags this code when the expected current draw is outside its normal range, indicating the injector coil or its wiring is not functioning correctly.

P1202 on a Jaguar means the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 2's fuel injector. The ECM monitors injector current and flags this code when the expected current draw is outside its normal range, indicating the injector coil or its wiring is not functioning correctly.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Illuminated check engine light, often with no other noticeable symptoms
Rough idle or misfire felt as a shake or stumble, especially when cold
Noticeable loss of power and reduced fuel economy
Engine may run rich or lean depending on whether the circuit is open or shorted
In severe cases, the engine may enter limp mode or hesitate under acceleration

Common causes, most likely first

Failed cylinder 2 fuel injector (open or shorted internal coil)
Damaged or corroded injector harness connector at cylinder 2
Broken, chafed, or shorted wire in the injector circuit between the ECM and injector
Poor electrical connection at the ECM connector for the injector driver
Internal ECM driver failure for the cylinder 2 injector circuit (rare but possible)
Rodent damage or heat-related insulation breakdown on the injector wiring

How to diagnose and fix it

Perform a visual inspection of the cylinder 2 injector connector and wiring for damage, corrosion, or loose pins
Measure the resistance of the cylinder 2 injector with a multimeter and compare to the manufacturer's specification
Check for battery voltage at the injector connector with the key on and engine off, using a test light or multimeter
Perform a continuity and short-to-ground test on the injector control wire from the ECM to the injector
Swap the cylinder 2 injector with a known-good injector from another cylinder and see if the code moves
Inspect the ECM connector pins for corrosion or push-out, and verify the injector driver signal with an oscilloscope if available
Replace the faulty injector, repair the wiring, or replace the ECM as diagnosed

What a P1202 injector code really tells you

A P1202 can be set by a completely failed injector or by a wiring fault that only appears when the engine is hot or vibrating, so always wiggle-test the harness while monitoring the code.
Jaguar's injector drivers are current-limited; a shorted injector may not blow a fuse but will cause the ECM to shut down that driver and set the code, so a simple fuse check is not enough.
This code is often accompanied by a misfire code for the same cylinder, but the misfire code alone does not confirm an injector fault—ignition and compression must be ruled out first.
On some Jaguar models, the injector harness runs near hot exhaust components and the insulation becomes brittle, causing intermittent shorts that only set the code after the engine warms up.
Replacing an injector without checking the resistance of the old one and the integrity of the connector is a common misdiagnosis that leads to a repeat repair.

Can I keep driving with P1202?

You can usually drive the car short distances to a repair shop, but avoid heavy acceleration or towing because a misfiring cylinder can overheat the catalytic converter and cause costly damage. If the engine is running very rough or flashing the check engine light, stop driving and have it towed.

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.