What does code P1608 mean?

Q: What does code P1608 mean?

Powertrain Control Module ECM CPU DTC Test Fault. P1608 on Mazda vehicles indicates that the Powertrain Control Module (PCM) has detected an internal fault during its own self-test of the engine control unit's central processing unit (CPU). The PCM runs a diagnostic test on its processor and memory at key-on, and this code sets when that internal check fails, pointing to a problem inside the PCM itself rather than an external sensor or actuator.

DTC codes / Mazda codes / P1608

P1608 · MazdaPowertrain Control Module ECM CPU DTC Test Fault

P1608 on Mazda vehicles indicates that the Powertrain Control Module (PCM) has detected an internal fault during its own self-test of the engine control unit's central processing unit (CPU). The PCM runs a diagnostic test on its processor and memory at key-on, and this code sets when that internal check fails, pointing to a problem inside the PCM itself rather than an external sensor or actuator.

SystemPowertrain

Code typeMazda specific

SeverityHigh

Fix difficultyProfessional

AreaComputer and output circuits

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