Question about 1992 Jaguar XJ6

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P1621 - 1992 Jaguar XJ6

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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 PARAMETERS
DTC P1621 will set if the TCM cannot communicate internally for a proper shut down.

DIAGNOSTIC AIDS
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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Se me presenta este problema p1621 y lo soluciono?


C?digo P1621 Problema significa : control del motor de inmovilizaci?n del motor m?dulo de mal funcionamiento del circuito de entrada.

Mar 03, 2015 | 1991 Jaguar XJR

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Have a 2001 gmc sonoma has code p1621 control modle long term menory perfprmace what is the fix for this code


I would disconnect the battery for a few min then hook it back up to see if it resets itself. if not you have bad cell in the battery and needs to be replaced. good luck

Dec 07, 2013 | 2001 GMC Sonoma Extended Cab

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P1621 immoblizir commnication line error


1: suzuki dealer.
2: read the FSM.
3: take it to any ASE shop.
pick one, this is a 100% suzuki ECU blocking device, (security)
id never own one, and 10x that now that suz is chapter 11.
I have a suz, would sell it but its not worth squat, due to above.
so will run mine to the ground. then junk it. No more suz, for me.

Mar 04, 2013 | 2002 Suzuki Grand Vitara

1 Answer

I have a 2001 pontiac sunfire the check engine light is on. when someone tried to reset it this code came up P1621 what does that mean?


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.

Jun 05, 2010 | 2001 Pontiac Sunfire

1 Answer

Jx6,x300 erro Cod P1621p1621


That code is for Engine control module engine immobilization input circuit malfunction. Ignition coil is ok.

Apr 09, 2010 | 1995 Jaguar XJ6

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95 jag problem diagnostic code is p1621 anybody know


The code means the engine control module imobilisation function is active.
can you describe what the car is doing and after you scanned the code did you try to reset it?
If so and there is no difference it may be a dealer reset only and you may have a bad ecu (water ingress?)
JPTCAT

Feb 16, 2009 | 1995 Jaguar XJ6

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