Gearbox Controller Fault After Water Enters a Connector

Visible moisture near transmission wiring needs an inspection of the installation, not just a request to dry a controller. Record where water was found, which functions failed and whether the vehicle was operated afterwards. Avoid repeated powering of visibly damaged equipment.

Preserve the evidence

Photograph accessible external damage without opening unfamiliar assemblies. Include recent washing, flooding, fluid leaks or repairs as factual context. A connector that looks dry later may not describe its earlier condition, so keep the first garage report.

Find the entry route as well as the damage

The repair plan should address how the contamination reached the area and which circuits were affected. Replacing a TCU without resolving an entry path can leave the underlying problem. The extent of damage cannot be established from a single photograph.

Send AXION the vehicle and transmission details before posting a unit. Explain whether connectors, wiring or seals have already been repaired. Agree the supported electronics assessment and any transmission or body work needed separately. The completed repair should include the applicable circuit and vehicle checks, with clear limitations if an intermittent or installed condition could not be reproduced on the bench.

Related help

Browse all fault guides or use the vehicle module finder to prepare your enquiry. Include the vehicle, symptoms, complete fault codes and any previous test results. Assessment scope and compatibility must be confirmed before booking or sending a unit.

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