Code P091, Transaxle Range Switch Problem: Notes

This test monitors the park/neutral input from transaxle range switch to PCM (PD72). Transaxle range switch also sends information relative to gear selection to instrument panel cluster (ID41). PCM compares the two decoded signals and if PCM detects a fault in one of the decoded signals or engine starts with no park/neutral input, or if vehicle is in forth gear and engine speed divided by vehicle speed is between 23 RPM/MPH, and park/neutral input indicates park/neutral Code P091, then Code I027 will set.