P0884

P0884-POWER UP AT SPEED





For a complete wiring diagram, refer to the Wiring Information.

Theory of Operation

If a vehicle loses power to the Transmission Control System, the solenoids (L/R, 2C, OD, UD, 4C) will go to their respective power off state. Some solenoids are normally vented and some are normally applied in their power off state. The transmission is designed to be in 3rd gear with all of the solenoids in this state. However, if power is restored, the Transmission Control System will power-up and normal operation will be restored.

This code identifies that power to the Transmission Control System was restored when the gear selector was in a "Drive" position while the vehicle was moving at speeds above 32 Km/h (20 mph). This DTC does not indicate a problem with the transmission or Transmission Control System, instead, it suggests intermittent problems in the fused ignition switch output, fused B(+), or ground circuits to the TCM. Alternately, if a person performs a rolling restart maneuver, the DTC can be set. Therefore it is critical that this DTC be investigated if the vehicle is experiencing intermittent 3rd gear operation and a subsequent return to normal operation.

- When Monitored:
When Powertrain Control Module initially powers up. Due to the integration of the Powertrain and Transmission Control Modules, the transmission part of the PCM has its own specific power and ground circuits.

- Set Condition:
This DTC will set if the Powertrain Control Module (PCM) powers up and senses the vehicle in a valid forward gear, with no PRNDL DTCs, and an output speed above 800 rpm, approximately 32 Km/h (20 mph).





Always perform the Pre-Diagnostic Troubleshooting Procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.
CHECK THE POWER AND GROUND CIRCUITS
1. This DTC is set when the Transmission portion of the Powertrain Control Module is initialized while the vehicle is moving down the road in a valid forward gear.
2. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors.
3. Check all of the Fused B(+), Fused Ignition Switch Output, and ground circuits to the PCM for an intermittent open or short to ground.
4. With the scan tool, check the Event Data to help identify the conditions in which the DTC was set.

Repair

- Check all power and ground circuits to the PCM and repair as necessary.
- Perform the 545RFE TRANSMISSION VERIFICATION TEST. . 545RFE Transmission Verification Test