Jaguar Code P1374 – Cylinder 4 Ignition Coil, Early Activation

Code P1374 Jaguar Description

The P1374 Jaguar code indicates there is a problem with the ignition coil in cylinder 4 of the vehicle’s engine. More specifically, it means premature activation of the ignition coil, which can lead to misfires, rough idling, and poor engine performance. The ignition coil is responsible for producing the high voltage needed to ignite the air-fuel mixture in the combustion chamber. When the ignition coil activates too early in cylinder 4, it can disrupt the combustion process and cause engine malfunction.

Common Causes of P1374 Jaguar

NOTE: The listed causes may not be a complete list of all potential problems, and there may be other causes.

1. Faulty ignition coil in cylinder 4
2. Wiring or connection issues with the ignition coil
3. Faulty Engine Control Module (ECM)
4. Spark plug problems in cylinder 4
5. Carbon buildup in the combustion chamber of cylinder 4

Symptoms of P1374 Jaguar

1. Engine misfires or rough idling
2. Decreased engine performance and power
3. Check Engine Light illuminated on the dashboard
4. Increased fuel consumption
5. Strong smell of unburned fuel from the exhaust pipe

How to Fix Code P1374 Jaguar

1. Diagnose the specific cause of premature ignition coil activation in cylinder 4 using a diagnostic scanner.
2. Inspect the ignition coil, wiring, and connections for any signs of damage or wear.
3. Test the spark plugs in cylinder 4 and replace them if necessary.
4. Reset the Engine Control Module (ECM) and reprogram if needed.
5. Clear the error codes from the vehicle’s computer and test the vehicle to ensure the issue has been resolved.