Failed fuel injector solenoid with an open internal coil; Damaged or chafed injector harness wiring near the cylinder 6 injector connector; Corroded or loose electrical connector at the cylinder 6 injector; Short to ground or short to power in the injector control circuit; Faulty engine control module (ECM) injector driver, though rare; Rodent damage to the injector wiring loom

DTC codes / Jaguar codes / P1206

P1206 · JaguarCylinder 6 Injector Circuit Open/Shorted

Q: What does code P1206 mean?

Cylinder 6 Injector Circuit Open/Shorted. P1206 on a Jaguar indicates that the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 6's fuel injector. The ECM monitors injector current and flags this code when the expected current draw is absent or out of range, meaning the injector may not be firing at all.

P1206 on a Jaguar indicates that the engine control module (ECM) has detected an open circuit or a short to ground or power in the electrical path for cylinder 6's fuel injector. The ECM monitors injector current and flags this code when the expected current draw is absent or out of range, meaning the injector may not be firing at all.

SystemPowertrain

Code typeJaguar specific

SeverityMedium

Fix difficultyIntermediate

AreaFuel and air metering (injector circuits)

Symptoms you may notice

Rough idle or misfire felt as a shaking engine, especially noticeable at stoplights
Loss of power and sluggish acceleration under load
Check engine light illuminated, sometimes flashing if the misfire is severe
Poor fuel economy due to incomplete combustion in cylinder 6
Often no symptoms besides the warning light if the injector circuit fails intermittently

Common causes, most likely first

Failed fuel injector solenoid with an open internal coil
Damaged or chafed injector harness wiring near the cylinder 6 injector connector
Corroded or loose electrical connector at the cylinder 6 injector
Short to ground or short to power in the injector control circuit
Faulty engine control module (ECM) injector driver, though rare
Rodent damage to the injector wiring loom

How to diagnose and fix it

Perform a visual inspection of the cylinder 6 injector connector and wiring for damage or corrosion
Measure the resistance of the cylinder 6 injector with a multimeter and compare to the manufacturer's specification
Check for battery voltage at the injector connector with the key on, then check for a pulsed ground signal during cranking using a noid light
Inspect the harness between the ECM and injector for continuity and shorts to ground or power
Swap the cylinder 6 injector with a known-good injector from another cylinder to see if the misfire moves
Repair or replace any damaged wiring or connectors, then clear the code and verify the repair with a road test

What a P1206 really tells you about cylinder 6

A P1206 can be set by a completely failed injector or by a wiring fault that only breaks contact when the engine is hot or vibrating, so always wiggle-test the harness while watching live misfire data.
Jaguar's injector drivers are robust but not indestructible; a shorted injector coil can damage the ECM output stage, so never replace the ECM without first confirming the injector and wiring are sound.
This code does not always mean the injector itself is bad; a loose ground for the engine wiring harness can cause multiple injector circuit codes, so check grounds before condemning parts.
On some Jaguar models, the injector harness runs near the exhaust manifold and heat damage can cause intermittent opens that only appear after the engine reaches operating temperature.
A noid light test is more reliable than a resistance check alone because it confirms the ECM is actually pulsing the injector circuit under cranking conditions.

Can I keep driving with P1206?

You can drive the car cautiously to a repair shop if the engine is running smoothly and the check engine light is steady, but avoid heavy acceleration or towing. If the check engine light is flashing or the engine is misfiring badly, stop driving to prevent catalytic converter damage from unburned fuel.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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