P2806: Transmission Range Sensor Alignment
What to do
Apply the parking brake every time you park, and treat the selector display with suspicion. The transmission has lost one of the two witnesses it uses to confirm which range it is in — check the car is truly holding before stepping away, and expect the occasional refused shift or reluctant start while it protects itself. Repair promptly; the second sensor is now the only one.
What this code means
The transmission range sensor is out of alignment with the gearbox's actual positions.
Alignment is the mechanical half of a range sensor being right. The sensor is bolted on and keyed to the selector shaft; work on the linkage, a rebuilt valve body, or simply loosened bolts leave it reading a fraction off every range at once — the electrical signal is clean, and every position it reports is slightly wrong. The repair is adjustment against the gearbox's true detents, not parts.
A second range sensor exists because the first one guarding park is not enough. The range sensor reports which gear range the transmission is actually in — the fact behind the selector display, the reverse lamps, and the rule that the starter only turns in park or neutral. Shift-by-wire designs duplicate it: with no mechanical cable to fall back on, the module wants two independent reports before it trusts either, especially about park.
Sensor B failing rarely strands the car; it removes the cross-check. The module can usually carry on watchfully using sensor A — but a car that misreports its range is a car that can roll away or start in gear, so expect caution: a flashing or wrong selector display, refusal to leave park, or a start that needs a second try.
These sensors fail the way all position sensors do — wear on the resistive track at the positions used most, water in a connector low on the gearbox, a harness chafed where it flexes. On cable-operated designs the sensor can also simply be out of adjustment, reading between ranges while the gearbox itself is exactly where it should be.
Likely causes
Start here
- Misadjusted transmission range sensor · moderate
- Worn gear selector linkage · specialist
Less common
- Faulty transmission range sensor · specialist
Rare
- Faulty transmission control module · specialist
Symptoms
Components involved
Information, not instruction
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Community experience
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