The transmission control module receives power from the electrical system, which is fitted with a number of relays and fuses to protect it from voltage fluctuations. If there is an intermittent power situation on the power circuit, a P0884 DTC will be saved.
How Serious is the Code?
Although it might not seem like it, the P0884 diagnostic trouble code is actually pretty serious. Not only does it mean that the TCM won’t have enough power to operate properly, this issue can also cause a number of drivability problems that include unexpected engine stalling.
Symptoms of a P0884 include:
- Rough gear changes
- Delayed or erratic shifting
- Engine stalling
- Shift interlock failure
- Malfunctioning speedometer
- Failure of the power relay for the TCM
- Corroded or failed fuse
- Fusible link failure
- Damaged wiring and/or connectors
How to Diagnose the Code?
In order to properly diagnose a P0884 OBDII trouble code, a technician should start by checking the voltage output of the battery and alternator. Provided both of those are working properly, then all of the fuses, fusible links and power relay should be checked. If everything looks good up to this point, did the wiring and connectors will have to be checked for signs of damage and corrosion.
What Repairs Will Fix P0884?
- Repair or replace damaged wiring/connectors
- Replace the power relay
- Replace the blown fuse(s)
- Replace the fusible link
- P0880 – TCM Power Input Signal
- P0881 – TCM Power Input Signal Range/Performance
P0882 – TCM Power Input Signal Low
P0883 – TCM Power Input Signal High