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18258 - Powertrain Data Bus: Missing Message from ECU...........What Does This Code Mean? TIA!

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Old 01-22-2008, 10:30 AM
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Default 18258 - Powertrain Data Bus: Missing Message from ECU...........What Does This Code Mean? TIA!
P1850 - 35-10 - - - Intermittent
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Old 01-22-2008, 10:46 AM
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Default 18258 - Ignition has been switched on while transmission control module -J217- was disconnected.....
Wiring open circuit or short between engine and transmission control module. Incorrect or faulty Transmission Control Module (TCM).

Kai, 2nd Google hit, answer was from PassatWorld forum, but it should apply.
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Old 01-22-2008, 10:49 AM
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It means your sig crashed your ECU
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Old 01-22-2008, 11:07 AM
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Default Somebody didn't clear the codes after the ECU was reflashed. Happens if you have the key on
with the ECU in reflash mode.
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Old 01-22-2008, 11:08 AM
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Default Kai, did you turn the ignition off before completing a vag scan?
<ul><li><a href="https://forums.audiworld.com/s4/msgs/1369419.phtml">click and read</a></li></ul>
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Old 01-22-2008, 11:14 AM
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Thanks! You know..maybe the 10 degree coldness confused something in the ECU/TCU
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Old 01-22-2008, 11:15 AM
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Default I don't remember doing so..CEL popped on last night, I just scanned it and came up with that code..
on the Auto Trans Control module.
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Old 01-22-2008, 11:17 AM
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Default That code wasn't there before when I scanned last week =>
I didn't clear it, still there..

Should I clear it?
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Old 01-22-2008, 11:22 AM
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Go into your TCU and clear it... then the ECU. Should remain off unless you have an issue.
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Old 01-22-2008, 11:24 AM
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It doesn't show up on the Engine control module, only on the Auto Trans module
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