Code 28, Illegal Transaxle Range Switch Input: Notes

Code will set if Codes 21, 22, 24, 56, 75, 86 and 91 are not set, vehicle speed is greater than 7 MPH, throttle angle is greater than 15.7 degrees, all conditions are present for at least 5 seconds and any one of the following: PCM detects an illegal input from transaxle range pressure switch, PNP switch indicating not in P/N but transaxle range pressure switch is indicating P/N with a valid drive transaxle gear ratio of 3.11 or less, transaxle range pressure switch indicating reverse with a transaxle gear ratio not within the recognized range (between 2.01 and 2.24), or transaxle range pressure switch indicating D1, D2, D3 or D4 with a transaxle gear ratio within the recognized reverse range (between 2.01 and 2.24).

1. Checks all range circuits for shorts to ground.
2. Checks for open circuits. If more than one range signal display is on when circuit is shorted to ground, inspect those circuits for shorts to each other.
3. These steps check internal transaxle harness for shorts to ground. If a short to ground is found, replace transaxle harness.
4. Checks internal transaxle harness for opens. If open is found, replace transaxle harness.