P1DB1 JEEP - Transmission Control Module System Voltage Excessively Low
- Open fuse
- Low battery voltage
- Engine charging system
- Faulty Transmission Control Module (TCM)
- Engine Light ON (or Service Engine Soon Warning Light)
P1db1 Jeep DescriptionThe Transmission Control Module (TCM) monitors the system voltage level at the TCM supply voltage terminal for the following failure conditions:
- System Voltage Excessively Low
- System Voltage Low
- System Voltage High
If the TCM supply voltage is below a threshold that is lower than the System Voltage Excessively Low threshold, the TCM will not supply power to the solenoid valves and pressure regulators. A Diagnostic Trouble Code (DTC) is set when one of the diagnostic voltage thresholds is reached for a calibrated amount of time.
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