Cause
Drive cycle for learning not completed
The learning drive cycle begun but never finished, so adaptation is incomplete. The reset is only half the procedure — the module then has to observe the new components across a defined range of speeds, loads and temperatures before its values mean anything.
A partly-learned transmission shifts badly and stores performance codes, which reads as a failed repair rather than an unfinished one. The cycle is specific: a range of gears at defined throttle openings, often from cold and often over several miles, and a vehicle handed back after a short road test has not done it. Check the module's own learning status where the tool exposes it, which distinguishes an incomplete cycle from a genuine fault and is far quicker than re-diagnosing.
Typically an easy fix. Often worth checking before paying anyone to look.
Codes this can cause (1)
Codes where this is a likely explanation first, rather than merely a possible one.
Information, not instruction
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- The car — make, model, year and engine. The same fault behaves differently on each.
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