What does code P0872 mean?
What does code P0872 mean?
A P0872 trouble code refers to a problem detected by the Powertrain Control Module (PCM) with the fluid pressure within the transmission. Some vehicle PCMs place the transmission into Limp-in mode in addition to storing a code and illuminating the Check Engine light.
How to troubleshoot an Allison transmission fault code?
ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL P0711 Transmission Fluid Temperature Sensor Circuit Performance P0712 Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature)
What does p0872 transmission fluid pressure sensor switch C circuit low?
If all prior tests have passed and you continue to get a P0872, this would most likely indicate a failed TFPS sensor, although a failed PCM/TCM could not be ruled out, nor could internal transmission malfunctions until the TFPS sensor had been replaced. If unsure, seek assistance from a trained automotive diagnostician.
Which is the low voltage sensor on a Allison Transmission?
PS voltage sensor low voltage 1. Pressure Sensor High Voltage PS 1. The voltage at the control unit is below normal. Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –
What to do if the p0872 code returns?
If the P0872 code does return, we will need to test the TFPS sensor and its associated circuits. With the Key Off, disconnect the electrical connector at the TFPS sensor. Connect a Digital Voltmeter (DVOM) black lead to the ground or low reference terminal at the TFPS sensor wiring harness connector.
ALLISON 1000/2000/24000 SERIES ELECTRONIC CONTROLS TROUBLESHOOTING MANUAL P0711 Transmission Fluid Temperature Sensor Circuit Performance P0712 Transmission Fluid Temperature Sensor Circuit Low Input (High Temperature)
What causes a transmission fluid pressure code of p0872?
Related trouble codes include a P0870, P0871, P0873, and P0874 code. A P0872 trouble code means that the transmission fluid pressure has exceeded or fallen below limits set by the manufacturer. What causes the P0872 code? A transmission leak causing a low fluid condition is one cause of a P0872 trouble code.
If the P0872 code does return, we will need to test the TFPS sensor and its associated circuits. With the Key Off, disconnect the electrical connector at the TFPS sensor. Connect a Digital Voltmeter (DVOM) black lead to the ground or low reference terminal at the TFPS sensor wiring harness connector.
PS voltage sensor low voltage 1. Pressure Sensor High Voltage PS 1. The voltage at the control unit is below normal. Remains in the selected gear, monitors the signal for changing the direction of movement. The display goes blank for 10 seconds, then shows – / – – / –
