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What does DTC P1621 mean on a 2001 Chevy cavlier mean and how to fix it?
Wiki User
∙ 12y ago
A vehicle control module (VCM) or powertrain control modules' (PCM) electronically erasable programmable read only memory (EEPROM) contains data essential to running the engine and transmission. The VCM/PCM stores critical preprogrammed data within the EEPROM, this data remains even if the vehicles' battery is disconnected. At power up the VCM/PCM checks the integrity of this data. If the checksum of the EEPROM does not match a predetermined value, DTC P1621 will set. The DTC will also set if the VCM/PCM is unable to correctly read or finds corrupt data from the EEPROM. GM recommends testing/replacement of the VCM/PCM using required equipment by a qualified technician for this type of VCM/PCM memory performance fault condition.
I hope this has shed some light on the matter of P1621 GM manufacturer specific diagnostic trouble code (DTC).
Answer: This answer was heplful but I had the same problem on my 99 cavailer and i went to the junkyard got another pcm for $50 and got it installed and reprogamed for only $174 (including taxes) that's your best way to go about it...unless you have the speacial comptuer to program the pcm to your vehcile...which is unlikely.
Wiki User
∙ 12y ago
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