Code 14 23 is programmed out of all calibrations. Allison WTEC II Fault Code: 14 PID: SPN: 12 FMI: Oil level sensor, failed low Allison WTEC II Fault Code: 13 PID: SPN: 23 FMI: ECU input voltage, high Allison WTEC II Fault Code: 13 PID: SPN: 13 FMI: ECU input voltage, medium low Allison WTEC II Fault Code: 13 PID: SPN: 12 FMI: ECU input voltage, low Detroit DD13 EPA07 (2007-09) Fault Code: SPN 5444 FMI 1 (MCM) Engine Crankcase Breather Oil Separator Speed Too Low Detroit DD13 EPA07 (2007-09) Fault Code: SPN 4259 FMI 4 (MCM) Injector Amplifier Control...

Main code 21 indicates the throttle position sensor has been retracted or extended by its linkage into an error zone. Code 21 23 is set when the ECU senses TPS counts of 233?255. Whenever a Code 21 XX condition is detected, the system defaults to 100 percent throttle and part throttle shifts will be abrupt. Possible causes:1. Sensor2. Wiring to the sensor or the ECM3. PWM signal problem Allison WTEC II Fault Code : 21 PID: SPN: 12 FMI: Throttle position sensor, failed low Allison WTEC II Fault Code: 14 PID: SPN: 23 FMI: Oil level sensor, failed high (not...

Main code 22 indicates a fault within a speed sensor, the wiring to a speed sensor, incorrect speed sensor gap, or damaged bumps or teeth which create the speed signal. This fault is determined by the reasonableness of a speed sensor signal when compared with the other two speed sensors and the commanded range. A speed sensor will not pass the reasonableness test if there is no signal at all from that sensor when a signal should be present. Allison WTEC II Fault Code: 21 PID: SPN: 23 FMI: Throttle position sensor, failed high Allison WTEC II Fault Code :...

Main code 22 indicates a fault within a speed sensor, the wiring to a speed sensor, incorrect speed sensor gap, or damaged bumps or teeth which create the speed signal. This fault is determined by the reasonableness of a speed sensor signal when compared with the other two speed sensors and the commanded range. A speed sensor will not pass the reasonableness test if there is no signal at all from that sensor when a signal should be present. Allison WTEC II Fault Code: 22 PID: SPN: 14 FMI: Engine speed sensor reasonableness test Allison WTEC II Fault Code: 21...

Main code 22 indicates a fault within a speed sensor, the wiring to a speed sensor, incorrect speed sensor gap, or damaged bumps or teeth which create the speed signal. This fault is determined by the reasonableness of a speed sensor signal when compared with the other two speed sensors and the commanded range. A speed sensor will not pass the reasonableness test if there is no signal at all from that sensor when a signal should be present. Allison WTEC II Fault Code: 22 PID: SPN: 15 FMI: Turbine speed sensor reasonableness test Allison WTEC II Fault Code: 22...