P1601 Injector Correction Circuit Malfunction (Diesel)
What does P1601 mean on a Toyota?
P1601. Injector Correction Circuit Malfunction (Diesel). This Toyota-enhanced code applies to Hilux, Land Cruiser Prado with D-4D common rail.
Common causes of P1601
- Injector compensation codes never programmed
- Replacement injector without code registration
- Corrupted correction data
- ECM memory fault
- Low voltage during programming
How to fix P1601
- Read injector compensation codes with a scanner
- Register each injector code to the ECM
- Verify programming stores after key cycles
- Stabilize battery voltage during registration
- Replace the ECM only if codes will not store
Sources and review
- Last updated 2026-09-06.