Allison 1000 & 2000 Gen 4 Fault Codes: P0880 TCM Supply Voltage. CIRCUIT DESCRIPTION: DTC P0880 sets if an abnormal power-down sequence has occurred. This condition means the Transmission Control Module (TCM) has lost supply voltage (wire 103) before it has finished saving information from that drive cycle. This process is usually completed in.. - Battery disconnect will not clear the codes on an Allison. - P0880 will not limp the trans or put it in a default mode I can't comment on the edge, my guess is they are doing a targeted code clear to just the ECM.. it will eventually clear itself. The P0880 means the TCM lost power for whatever reason unnaturally, this goes along with the.
P0880: Transmission control module (TCM) -power input signal malfunction (Buy Part On Amazon) Wiring, poor connection, TCM: We recommend Torque Pro.. I have a 2009 Peterbilt with a gen 4 Allison that displays 2 plus signs after being illuminated for a couple of minutes or sooner; if I turn the key off for a few minutes & then back on, the.. P0880 Disappearance of power supply control unit during operation engine Off. - P0881 The voltage at the control unit is too low or jump Off. - P0882 ONThe voltage at the control unit below normal . DNS, SOL OFF hydraulic control active P0883 The voltage at the control unit above the norm Off. - P088A Oil filter clogged Off.