Subaru Error Code P1602: How to Fix It

Q: What causes Subaru P1602 error code?

P1602 is typically caused by low battery voltage, blown ECM fuses, damaged wiring harness, poor ground connections, failing alternator, or internal ECM failure. The most common causes are battery or charging system issues.

Q: Can I drive with P1602 code?

You should avoid driving with P1602 as it indicates the ECM isn't receiving proper power, which can cause unpredictable engine behavior, stalling, or complete failure to start. Address this issue immediately for safety.

Q: How much does it cost to fix P1602?

Costs vary depending on the root cause: new fuses ($5-10), battery replacement ($100-200), alternator replacement ($300-600), or ECM replacement ($800-1500). Many cases are resolved with simple electrical repairs under $100.

Q: Will P1602 clear itself?

P1602 may clear temporarily if the power issue is intermittent, but it will return until the underlying electrical problem is fixed. Clearing the code without fixing the cause provides only temporary relief.

Q: Does P1602 affect other systems?

Yes, since P1602 indicates ECM power problems, it can affect engine performance, fuel injection, ignition timing, and emissions systems. Other control modules may also be affected if there's a widespread electrical issue.

Abstract

Subaru error code P1602 indicates a problem with the control module power supply circuit, which can cause various engine performance issues including rough idling, stalling, or failure to start. This error typically occurs when the Engine Control Module (ECM) isn't receiving proper voltage or has lost power unexpectedly.