P1621 Buick Control Module Long Term Memory Performance Condition
Possible causes
– Faulty Powertrain Control Modules (PCM)
– Low car battery voltage
– Low car battery voltage
What about the obd code?
If the checksum of the Electronically Erasable Programmable Read Only Memory (EEPROM) does not match a predetermined value by the Powertrain Control Modules (PCM), DTC P1621 Buick will set.
Symptoms
– Engine Light ON (or Service Engine Soon Warning Light)
P1621 Buick Description
The Powertrain Control Modules (PCM) Electronically Erasable Programmable Read Only Memory (EEPROM) contains data essential to running the engine and transmission. The PCM stores critical preprogrammed data within the EEPROM, this data remains even if the vehicles’ battery is disconnected. At power up the PCM checks the integrity of this data.
Buick Vehicle:Buick Regal – ?Buick Riviera – ?Buick LaCrosse – ?David Dunbar Buick – Buick Century – Buick LaCrosse – Buick LeSabre – Buick Lucerne – Buick Park Avenue – Buick Regal – Buick Verano – Buick Enclave – Buick Encore – Buick Rainier – Buick Rendezvous – Buick Terraza – Buick Riviera