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Getting gearbox fault on xj8.....usually a short time after

Customer Question
i have used reverse. howevr...
getting gearbox fault on xj8.....usually a short time after i have used reverse. howevr after turning car off and restarting...its all fine. don't think gearbox but perhaps electrical fault ?
JA: What year is your XJ8?
Customer: 2001
JA: Are you hoping to fix this yourself? What have you tried so far?
Customer: nothing....mechanics say gearbox wiring is like a telephone box and nobody in right mind would loom at it...lol
JA: Anything else you think the mechanic should know?
Customer: did get engine safe mode once after the gearbox, no tracs etc appeareed...diagnostics said 7 and 8 cylinder not firing...but mechanic said not the case as all were firing just fine
JA: How many miles are on the car? Is it an automatic or a manual transmission?
Customer: 131000 auto 3.2 xj8 sport with lpg conversion
Submitted: 1 year ago.Category: Jaguar
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Answered in 2 minutes by:
7/28/2016
Jaguar Mechanic: Richard, Jaguar Technician replied 1 year ago
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 15,575
Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.
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We're any fault codes stored in the Transmission Control Module? Did you see a gearbox over temp warning?
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Customer reply replied 1 year ago
what would the over temp warning be ?
Customer reply replied 1 year ago
no idea about fault codes...mechnic said diagnostic said 7 and 8 cylinder not firing
Customer reply replied 1 year ago
no idea about fault codes...mechanic said diagnostic said 7 and 8 cylinder not firing
Jaguar Mechanic: Richard, Jaguar Technician replied 1 year ago
The over temp warning is usually caused by a failed temp sensor which is actually part of the internal harness. The cylinder 7 and 8 misfire can cause a restricted performance warning but not the gearbox fault. We need a compatible tool that can retrieve fault codes from the TCM. Let me know.
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Customer reply replied 1 year ago
spoke to mechanic...he forgot to write down codes...normally does...but he said one had to do with injector wiring and something to do with circuit board ...they thought it might have something to do with the splicing in of the lpg wiring ???
Jaguar Mechanic: Richard, Jaguar Technician replied 1 year ago
OK those codes could be caused by the ignition coils on those cylinders but will not be the cause of the gearbox fault. We really need a code number for the transmission fault codes
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Customer reply replied 1 year ago
ok....so will these still be on the TCM ..or would they have dissappeared when they reset it ? ive not had the engine management light come on again since...just the gearbox fault once
Jaguar Mechanic: Richard, Jaguar Technician replied 1 year ago
It will depend on the tool used to clear the faults. If it does not communicate with the TCM there still may be a code.
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Richard
Richard
Richard, Jaguar Technician
Category: Jaguar
Satisfied Customers: 15,575
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Experience: 12 years at a Ford/Lincoln Mercury and Jaguar dealer as technician and shop foreman.

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