Allison WTEC II Fault Code: 21 PID: SPN: 23 FMI: Throttle position sensor, failed high
Main code 21 indicates the throttle position sensor has been retracted or extended by its linkage into an error zone.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. Sensor
2. Wiring to the sensor or the ECM
3. PWM signal problem
![MAN MANTIS v666 EPC [09.2021] Spare Parts Catalog](https://www.ecuforcetruck.com/wp-content/uploads/2022/01/MANTIS-V666-300x300.png)
![download Hitachi Construction Machinery MPDr Ver 3.7.0.0 [10.2020] Diagnostic Software](https://www.ecuforcetruck.com/wp-content/uploads/2023/05/MPDR-3.7.00-300x300.png)
Related products
-
-
Allison 1000 & 2000 Gen 4 Fault Codes: P0122 Pedal Position Sensor Circuit Low Voltage
1000 & 2000 Gen 4 $50.00 -
Allison 1000 & 2000 Gen 4 Fault Codes: U1096 J1850 (Class 2) IPC Controller State of Health Failure
1000 & 2000 Gen 4 $50.00 -
-
Bendix ABS EC-30 Fault Code: SID 251 FMI 3
Bendix ABS -
Allison 1000 & 2000 Gen 4 Fault Codes: U1000 Class 2 Loss of Serial Data Communication
1000 & 2000 Gen 4 $50.00 -
-
Allison 1000 & 2000 Gen 4 Fault Codes: P2773 Torque Control Request Ignored – ECM/TCM
1000 & 2000 Gen 4 $50.00 -
-
-
-
-
-
-
Allison 1000 & 2000 Gen 4 Fault Codes: P2771 Four-Wheel Drive Switch Circuit
1000 & 2000 Gen 4 $50.00
