Question about 1992 Jaguar XJ6
Trouble code P1621 means: Engine control module engine immobilization input circuit malfunction
The Transmission Control Module (TCM) contains various types of memory to gather and share information internally. At shut down, the TCM stores information in memory to prepare for the next ignition cycle. When the TCM cannot communicate internally, DTC P1621 sets. DTC P1621 is a type A DTC.
DTC P1621 will set if the TCM cannot communicate internally for a proper shut down.
The suggested repair is TCM replacement. Remember to program the replacement TCM with the correct software and calibration. however Ive know loose positive battery cable to toss out that code, so check your connections
Posted on May 21, 2011
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Posted on Jan 02, 2017
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