P1DB6 FIAT – Vehicle Speed Signal Performance

P1DB6 FIAT Possible Symptoms

Engine Light ON (or Service Engine Soon Warning Light)

P1DB6 FIAT Possible Causes

Check for Powertrain Control Module (PCM) codes,Faulty Transmission Control Module (TCM)

P1DB6 FIAT Description

The Transmission Control Module (TCM) can detect rationality failures of the input (turbine) speed sensor and output speed sensor signals as well as the wheel speed and engine speed signals received through the Controller Area Network (CAN). The TCM performs three diagnostic checks that include: – Multi sensor comparisons of up to three speed signals (input, output and wheel speed). – Monitoring of the gradient of the input speed signal. – Double failure monitoring to determine unique failure situations which could require unique limp-in functionality.