Bad ground... hope this helps
check engine light with transmission control module (TCM) diagnostic trouble code (DTC) P06B8 or P0884.
ACTION:
Follow the Service Procedure steps to correct the condition.
SERVICE PROCEDURE
Remove attaching bolts for the G100 battery ground and G106 powertrain control module (PCM) ground. Remove the paint under the ground eyelet mounting locations. Apply Motorcraft® Electrical Grease to the bolts to prevent corrosion and reinstall. Torque bolts to 115 lb-in (13 Nm). (Figure 1)
Figure 1 - Article 10-19-6
Using digital volt ohm meter (DVOM), measure battery voltage. Battery voltage must be between 12.5 and 14 volts. If below, charge and retest. Refer to Workshop Manual (WSM), Section 414-01.
Using DVOM, with key on engine off (KOEO), measure voltage from battery positive terminal to G106 PCM ground bolt. Compare to battery voltage measurement in step 2. Voltage drop must be less than 0.5 volt difference. Refer to WSM, Section 414-00.
Using IDS, verify VPWR and B positive are between 12.5 and 14 volts. If not, refer to WSM for low voltage diagnostics.
Verify vehicle transmission:
Manual Transmission.
Do not continue with this procedure.
Automatic Transmission.
Proceed to Step 6.
Reprogram the TCM by reprogramming the PCM to the latest calibration using IDS release 69.02 and higher. The PCM and TCM are a matched set. The TCM can only be updated by updating the PCM. This new calibration is not included in the VCM 2010.9 DVD. Calibration files may also be obtained at Buy Motorcraft Parts Online | Official Motorcraft Auto Parts Site | FordParts.com.
Perform all three TCM clutch adaptive learning routines (TRS, Shift Drum and Clutch). Refer to TCM Adaptive Learning in WSM, Section 307-11.
NOTE: IF A DRIVE CYCLE IS NOT COMPLETED, THE CUSTOMER MAY FEEL ERRATIC SHIFTS AND DRIVEABILITY
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