P1630 ISUZU – System Voltage Error Conditions

P1630 ISUZU Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1630 ISUZU Possible Causes

The PCM in learn mode is a DTC for the vehicle at the assembly plant, dealership, and outside garage personnel as an indication that the learn mode is enabled. This means the PCM is now ready to learn a new password.

P1630 ISUZU Description

Engine running, then the Powertrain Control Module (PCM) detected the system voltage was under 9v or over 17v, either condition met for over 10 seconds.