Pinpoint Test G : DTCS P177B, P177D
WARNING: This page is about a different variant/trim than selected.
- G1 RETRIEVE AND RECORD MODULE DTCS
- Using the diagnostic scan tool, retrieve all DTCs.
Are DTCs P177B and/or P117D present?
Yes GO to G2 No The system is operating correctly at this time. - G2 CHECK THE TRANSMISSION MANUAL CONTROL LEVER
- Make sure the transmission manual control lever is in the park position.
- Apply the park brake.
- Disconnect the selector lever cable from the transmission manual control lever.
- Manually move the manual control lever from the park position to the low position.
Does the transmission manual valve move through each range without restriction?
Yes GO to G3 No INSPECT the transmission manual valve and the transmission rooster comb spring, REFER to: Main Control Valve Body . - G3 CHECK THE SELECTOR LEVER CABLE
- Disconnect the selector lever cable from the TRCM output arm.
- Manually move the selector lever cable.
Does the selector lever cable slide without restriction?
Yes GO to G4 No INSTALL a new selector lever cable. REFER to: Selector Lever Cable . - G4 PERFORM THE TRCM (TRANSMISSION RANGE CONTROL MODULE) SELF-TEST
- Connect the selector lever cable to the TRCM output arm and the transmission manual control lever.
- Perform the TRCM self-test.
Are DTCs P177B and/or P117D present?
Yes INSTALL a new TRCM. REFER to: Transmission Range Control Module (TRCM) . No The system is operating correctly at this time.