What does code P1602 mean?

Q: What does code P1602 mean?

Power Supply Terminal No 30 Low Voltage. P1602 on Volkswagen vehicles means the engine control module (ECM) has detected that the voltage on terminal 30, the constant battery power feed, has dropped below a safe threshold. Terminal 30 is the circuit that should always have battery voltage even with the key off, so a low reading tells the ECM its memory or power supply is being starved. This is a power-supply fault, not a sensor or engine-management fault.

DTC codes / Volkswagen codes / P1602

P1602 · VolkswagenPower Supply Terminal No 30 Low Voltage

P1602 on Volkswagen vehicles means the engine control module (ECM) has detected that the voltage on terminal 30, the constant battery power feed, has dropped below a safe threshold. Terminal 30 is the circuit that should always have battery voltage even with the key off, so a low reading tells the ECM its memory or power supply is being starved. This is a power-supply fault, not a sensor or engine-management fault.

SystemPowertrain

Code typeVolkswagen specific

SeverityMedium

Fix difficultyIntermediate

AreaComputer and output circuits

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