Djidji
Automatic transmission problem on Audi A8
(Translated from French)
Summary of the thread
The owner of a 1998 Audi A8 is experiencing an automatic transmission issue where the car enters emergency mode, slips, and loses reverse gear unless the computer is reset. Initial suggestions include checking the transmission fluid, but since maintenance has been completed, the focus shifts to inspecting the transmission control module (TCM) for fault codes. However, the diagnostic tool cannot connect, prompting advice to check the wiring and connections to the TCM for damage or corrosion.
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7 comment(s)
Djidji (community.author)
community_quotation:
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Start by checking the transmission fluid level and condition. Low or dirty fluid can cause slipping and gear issues. Make sure the fluid is at the correct level and is clean. If the fluid is low, top it up and see if the problem persists. If the fluid is dirty, consider a transmission fluid change. Let us know how it goes or if you have any further questions!
Hello, thank you for your reply. I forgot to specify that I did complete maintenance of the gearbox.
(community_translated_from_language)
CarlyMechanic
community_quotation:
community_author_wrote_on
Hello, thank you for your reply. I forgot to specify that I did complete maintenance of the gearbox.
Since you've already completed maintenance on the gearbox, the next step is to inspect the transmission control module (TCM) for any fault codes using a diagnostic scanner. Fault codes can provide specific information about what might be causing the issue. If you find any codes, they can guide you on the next steps. Let us know what you find or if you have any further questions!
Djidji (community.author)
community_quotation:
community_author_wrote_on
Since you've already completed maintenance on the gearbox, the next step is to inspect the transmission control module (TCM) for any fault codes using a diagnostic scanner. Fault codes can provide specific information about what might be causing the issue. If you find any codes, they can guide you on the next steps. Let us know what you find or if you have any further questions!
My calculator is working, but when I try to run a diagnostic, it says no connection is possible, refusing all communication.
(community_translated_from_language)
CarlyMechanic
community_quotation:
community_author_wrote_on
My calculator is working, but when I try to run a diagnostic, it says no connection is possible, refusing all communication.
Check the wiring and connections to the transmission control module (TCM) for any signs of damage or corrosion. A poor connection could prevent communication with the diagnostic tool. If everything looks fine, it might be necessary to have a professional inspect the TCM and its connections. Let us know if you need further assistance!
Djidji (community.author)
community_quotation:
community_author_wrote_on
Check the wiring and connections to the transmission control module (TCM) for any signs of damage or corrosion. A poor connection could prevent communication with the diagnostic tool. If everything looks fine, it might be necessary to have a professional inspect the TCM and its connections. Let us know if you need further assistance!
What do you mean by checking the wiring? I've already checked my calculator, it's ok.
(community_translated_from_language)
CarlyMechanic
community_quotation:
community_author_wrote_on
What do you mean by checking the wiring? I've already checked my calculator, it's ok.
Inspect the wiring harness and connectors leading to the transmission control module (TCM) for any visible damage, loose connections, or corrosion. Pay special attention to any signs of wear or fraying. If you find any issues, repairing or replacing the affected wiring might resolve the communication problem. Keep us updated on your progress or if you have more questions!
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AUDI
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A8
CarlyMechanic
Start by checking the transmission fluid level and condition. Low or dirty fluid can cause slipping and gear issues. Make sure the fluid is at the correct level and is clean. If the fluid is low, top it up and see if the problem persists. If the fluid is dirty, consider a transmission fluid change. Let us know how it goes or if you have any further questions!