AW4 Archives - Transmission Digest
Toot Your Own Horn!

As Denny Gipe from Dennis Gipe Transmissions in Chambersburg, Pa., mentioned in this month’s Shift Pointers article, ATSG has experienced the P0123 code in late-model Jeeps using the 2.5- or 4.0-liter engines and the AW4 transmission. P0123 indicates TPS voltage high, and in these vehicles it produces a complaint of no upshift. One cause for this condition is the horn’s 12-volt clock spring inside the steering wheel short-circuiting with the cruise-control’s switch-sense wire (Figure 1).