What does code P1606 mean?

Q: What does code P1606 mean?

ECM Control Relay Output Circuit. P1606 on a Jaguar indicates that the Engine Control Module (ECM) has detected an unexpected condition in the output circuit that controls its own power relay, often called the ECM control relay or main relay. The ECM monitors the voltage or current on this circuit and sets the code when the signal does not match the expected state, which can prevent the engine from starting or cause intermittent stalls.

DTC codes / Jaguar codes / P1606

P1606 · JaguarECM Control Relay Output Circuit

P1606 on a Jaguar indicates that the Engine Control Module (ECM) has detected an unexpected condition in the output circuit that controls its own power relay, often called the ECM control relay or main relay. The ECM monitors the voltage or current on this circuit and sets the code when the signal does not match the expected state, which can prevent the engine from starting or cause intermittent stalls.

SystemPowertrain

Code typeJaguar specific

SeverityHigh

Fix difficultyProfessional

AreaComputer and output circuits

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