P0915: Gear Shift Position Circuit A Range/Performance
What to do
Ask whether the fault is a shift that times out rather than an electrical problem — on this kind of gearbox that usually means a worn synchroniser, which is a gearbox repair rather than an electronic one, and knowing that early avoids paying for the wrong diagnosis first.
What this code means
The gear shift position signal is present but implausible — most usefully, a position that sits between engaged and neutral rather than decisively at either.
On a synchronised manual gearbox that in-between position has a specific meaning: the mechanism has pushed the collar towards the gear and not completed engagement, which is what happens when a synchroniser can no longer bring the shaft speeds together quickly enough. A human driver feels that as a change that needs a moment of extra pressure. A robot working to a fixed force and a timeout simply records a fault.
Likely causes
Start here
- Worn synchroniser · specialist
- Gearbox actuator calibration lost · moderate
- Faulty gear shift position sensor · specialist
Less common
- Faulty gear shift actuator · specialist
- Worn clutch · 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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- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
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