P2805
Transmission Range Sensor A/B Correlation
The two range sensor channels A and B do not agree on the same gear selector position. Plausibility check fails after debounce.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Common causes
Ordered by how often each turns out to be the cause.
- One sensor mechanically misalignedCommon
- Aged switch contacts on one channelPossible
Parts involved
- Transmission Range Sensor A
- Transmission Range Sensor B
- TCM
P2805 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.