Code 71, Internal DERM Fault: Description

WARNING: This page is about a different car, the 1991 Geo Storm, 1991 Geo Metro, 1990 Geo Storm, and 1990 Geo Metro. However, it is still accessible from the selected car via links, so may be relevant.

Code 71 is an internal DERM fault and will set if any of following conditions are detected:

DERM power supply reserve voltage charge or discharge time fails.
DERM power supply reserve voltage is less than 13 volts or greater than 19.6 volts for 500 milliseconds.
DERM is unable to read from or write to Electrically Erasable Programmable Read Only Memory (EEPROM).
36VLR is greater than 44 volts for 500 milliseconds.