Whot is the error code p1638 and who to fix it
P1638 Instrument to ECM , CAN (control area network) short circuit failure,this is either the instrument panel at fault or the ECM.Basically its a open wire. between ECM and instrument panel
SOURCE: my s type jaguar dtc
Fault codes are listed in the technical handbook, no good to you as it's a Jaguar service item unless you can get a copy of JTIS from ebay etc.
Fault Code:- P1638 Indicates a Power-train fault
The fault is generally due to a problem in the Computer & Output Circuit area
Fault Description: CAN ECM / INST network malfunction
Action of ECM:- none
After clearing the DTC, complete the Ignition ON 10 seconds
Check for a reoccurrence of fault DTC.
Possible Fault:- CAN open circuit fault - INST to ECM CAN short circuit fault INST failure ECM failure D
SOURCE: how do i fix code po420 & po430 on 2003 jaguar
Both these codes relate to Catalyst efficiency below threshold on banks 1+2. This is normally caused by a combustion fault. This fault may be shown due to a faulty sensor in either air imput or exhaust systems, Get the memory read at a dealers or good garage. If you had a serious problem the car would not drive well.
Hope this helps - good luck.
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