What does code P1702 mean?

Q: What does code P1702 mean?

Auto Trans Diagnosis Input Signal Circuit. P1702 on Subaru vehicles means the Transmission Control Module (TCM) has detected an abnormal signal from the automatic transmission diagnosis input circuit, which is the data line that carries the transmission's self-diagnostic status to the TCM. The TCM monitors this circuit for expected voltage or continuity and flags the code when the signal is missing, erratic, or outside its normal range.

DTC codes / Subaru codes / P1702

P1702 · SubaruAuto Trans Diagnosis Input Signal Circuit

P1702 on Subaru vehicles means the Transmission Control Module (TCM) has detected an abnormal signal from the automatic transmission diagnosis input circuit, which is the data line that carries the transmission's self-diagnostic status to the TCM. The TCM monitors this circuit for expected voltage or continuity and flags the code when the signal is missing, erratic, or outside its normal range.

SystemPowertrain

Code typeSubaru specific

SeverityMedium

Fix difficultyIntermediate

AreaTransmission

Guidance is general and written for Subaru vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.