P0794: Intermediate Shaft Speed Sensor A Circuit Intermittent
What to do
If the gearbox briefly goes wrong and then recovers, that is this fault rather than imagination. Note whether it happens when hot or over rough surfaces — both point somewhere different.
What this code means
The intermediate shaft speed signal drops out briefly and returns, prompting a protective shift each time. The result is a transmission that misbehaves for a few seconds and recovers, repeatedly.
The internal harness is the leading suspect, as it is for every sensor inside the case: it lives in hot fluid, moves with the valve body, and passes through a sealed fitting where fluid can wick into the wire strands and part a crimp from within. None of that is visible from outside.
Likely causes
Start here
- Damaged transmission wiring harness · moderate
- Corroded transmission connector · moderate
- Faulty intermediate shaft speed sensor · specialist
Less common
- Metal debris on the sensor tip · specialist
Symptoms
Components involved
Information, not instruction
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Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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