Pinpoint Test R: DTCS P27B2, P2806
- Normal Operation and Fault Conditions
The park pawl motor moves a park pawl rod when energized, moving the park pawl out of the Park position. When the park pawl is in the out of park position, the park pawl motor turns off and a hold out of park (HOOP) solenoid energizes and holds the park pawl out of Park. When power is turned off to the HOOP solenoid a spring returns the park pawl to the Park position. The park pawl actuator uses dual PWM output (at 1000 Hz) park pawl position sensors where sensor A increases as the park pawl moves out of Park and sensor B decreases. Together the sum of the two PWM signal duty cycles should add up to approximately 100%. A rotary sensor measures the position of a cam actuator that moves the linear park pawl rod and determines whether the park pawl actuator is in the "Stay out of Park" mode.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition SOBDMC P27B2:00 Internal Control Module Transmission Range Control Performance: No Sub Type Information This DTC indicates the actual park pawl position does not match the indicated park pawl position. SOBDMC P2806:79 Transmission Range Sensor Alignment: Mechanical Linkage Failure This DTC indicates the park pawl position sensors indicate the park pawl is in Park but the park pawl is actually out of Park. Possible Sources
- Park pawl linkage worn or damaged.
- Park lock actuator fasteners loose.
- Internal park pawl actuator linkage worn or damaged
- R1 RETRIEVE AND RECORD ALL DTCS
- Using the diagnostic scan tool, retrieve all diagnostic trouble codes (DTCs).
Are diagnostic trouble codes (DTCs) P27B2 and/or P2806:79 present?
Yes CHECK for an applicable TSB, GSB, SSM, or FSA. If a service bulletin exists for this concern, discontinue this test and follow bulletin instructions. If none address this concern, GO to R2 No The system is operating correctly at this time. The concern may be intermittent. - R2 CHECK THE PARK PAWL ACTUATOR FASTENERS
- Remove the transmission case end cover. REFER to: Park Lock Actuator .
- Check the park lock actuator fasteners for correct torque. REFER to: Park Lock Actuator .
Are the park lock actuator fasteners correctly torqued?
Yes GO to R3 No TIGHTEN the park lock actuator fasteners. REFER to: Park Lock Actuator . - R3 INSPECT THE PARK LOCK ACTUATOR LINKAGE FOR DAMAGE
- Remove the park lock actuator. REFER to: Park Lock Actuator .
- Inspect the park lock actuator park rod, park rod guide, spring and park pawl for wear or damage.
Are any components worn or damaged?
Yes INSTALL new components as necessary. No The park lock actuator may be damaged internally. INSTALL a new park lock actuator. REFER to: Park Lock Actuator .