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Trouble shoot error code P1621 - Cars & Trucks

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Posted on Jan 02, 2017

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SOURCE: 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

Posted on Feb 17, 2009

  • 1608 Answers

SOURCE: have trouble code P1621

This code is for an internal problem with the powertrain control module.(pcm)The PCM is located on the passengers side fender under the front.The plastic wheel well cover has to be removed to see it.This is a bad area and the pcm gets dirt,wet,and dust on it.There was a recall for installing a cover on it and you can check if your has one.This could be the problem with your vehicle and you might have to replace the pcm.Hope this helps.Good luck.

Posted on Feb 01, 2010

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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.

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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


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P1621


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


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Apr 09, 2010 | 1995 Jaguar XJ6

1 Answer

Have trouble code P1621


This code is for an internal problem with the powertrain control module.(pcm)The PCM is located on the passengers side fender under the front.The plastic wheel well cover has to be removed to see it.This is a bad area and the pcm gets dirt,wet,and dust on it.There was a recall for installing a cover on it and you can check if your has one.This could be the problem with your vehicle and you might have to replace the pcm.Hope this helps.Good luck.

Feb 01, 2010 | 1998 Pontiac Sunfire

1 Answer

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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