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Symptom Driven Power Liftgate System Diagnosis

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.
CONDITION POSSIBLE CAUSES CORRECTION
LIFTGATE WILL NOT INITIATE POWER OPEN/POWER CLOSE WITH EITHER FOBIK OR OVERHEAD CONSOLE SWITCH 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
2. Power Liftgate Input/Output status incorrect. 2. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
3. Binding or sticking of components. 3. Establish location of binding or sticking components. Repair or replace if required.
4. Wiring problems (system or vehicle). 4. Refer to the appropriate wiring information. Repair if required.
5. Ineffective Power LiftGate Module (PLGM). 5. Test the PLGM using a diagnostic scan tool. Replace if required.
6. Ineffective power liftgate latch assembly. 6. Check for foreign matter or damaged components preventing proper latch operation. Use diagnostic scan tool to cycle the latch. Replace if required.
7. Ineffective liftgate Power Drive Unit (PDU). 7. Use a diagnostic scan tool to cycle the PDU. Replace if required.
FOBIK DOES NOT OPERATE POWER LIFTGATE, BUT OVERHEAD CONSOLE SWITCH DOES 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  2. Power Liftgate Input/Output status incorrect. 2. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  3. Key in ignition. 3. FOB with Integrated Key (FOBIK) buttons do not function while key is in ignition by design. Remove key from ignition and retry.
  4. Ineffective FOBIK. 4. Reprogram FOBIK and retry. Replace if required.
  5. Ineffective Keyless Ignition Node (KIN). 5. Test the KIN using a diagnostic scan tool. Replace if required.
  6. Wiring problems (system or vehicle). 6. Refer to the appropriate wiring information. Repair if required.
  7. Ineffective Controller Area Network (CAN) data bus. 7. Test the CAN data bus using a diagnostic scan tool. Repair if required.
  8. Ineffective PLGM. 8. Test the PLGM using a diagnostic scan tool. Replace if required.
OVERHEAD CONSOLE SWITCH DOES NOT OPERATE POWER LIFTGATE - BUT FOBIK DOES 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  2. Power Liftgate Input/Output status incorrect. 2. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  3. Ineffective power liftgate overhead console switch. 3. Test the overhead console switch. Replace if required.
  4. Wiring problems (system or vehicle). 4. Refer to the appropriate wiring information. Repair if required.
  5. Ineffective PLGM. 5. Test the PLGM using a diagnostic scan tool. Replace if required.
LATCH WILL NOT RELEASE WITH EXTERIOR HANDLE, POWER-OPEN CYCLE MAY OR MAY NOT INITIATE 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  2. Power Liftgate Input/Output status incorrect. 2. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  3. Ineffective power liftgate exterior handle switch. 3. Test the exterior handle switch. Replace if required.
  4. Ineffective power liftgate latch assembly. 4. Check for foreign matter or damaged components preventing proper latch operation. Use diagnostic scan tool to cycle the latch. Replace if required.
  5. Wiring problems (system or vehicle). 5. Refer to the appropriate wiring information. Repair if required.
  6. Binding or sticking of components. 6. Establish location of binding or sticking components. Repair or replace if required.
  7. Ineffective PLGM. 7. Test the PLGM using a diagnostic scan tool. Replace if required.
LIFTGATE REVERSES DIRECTION DURING POWER OPEN - POWER CLOSE CYCLE 1. FOBIK button being hit more than the two times, or overhead console switch being hit more than once. 1. By design, the liftgate will reverse direction if the FOBIK button is depressed more than twice or the overhead console switch button is depressed more than once.
  2. Power Liftgate System Inhibitors preventing operation. 2. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  3. Power Liftgate Input/Output status incorrect. 3. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  4. Binding or sticking of components. 4. Establish location of binding or sticking components. Repair or replace if required.
  5. Wiring problems (system or vehicle). 5. Refer to the appropriate wiring information. Repair if required.
  6. Ineffective liftgate PDU. 6. Use a diagnostic scan tool to cycle the PDU. Replace if required.
  7. Ineffective PLGM. 7. Test the PLGM using a diagnostic scan tool. Replace if required.
LATCH WILL NOT POWER-CINCH TO PRIMARY POSITION DURING MANUAL OR POWER OPERATION 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  2. Pinch sensor activated or opened shorted circuit. 2. Check pinch sensor status using a diagnostic scan tool. Repair or replace if required.
  3. Power Liftgate Input/Output status incorrect. 3. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  4. Binding or sticking of components. 4. Establish location of binding or sticking components. Repair or replace if required.
  5. Liftgate weather seal force too high. 5. Inspect weather seals for damage, improper installation, foreign matter or other possible obstructions. Repair if required.
  6. Wiring problems (system or vehicle). 6. Refer to the appropriate wiring information. Repair if required.
  7. Ineffective power liftgate latch assembly. 7. Check for foreign matter or damaged components preventing proper latch operation. Use diagnostic scan tool to cycle the latch. Replace if required.
  8. Ineffective PLGM. 8. Test the PLGM using a diagnostic scan tool. Replace if required.
LIFTGATE SAGS AFTER COMPLETION OF POWER OPEN CYCLE OR MANUAL OPENING 1. Loose or damaged PDU or strut mounts. 1. Check for loose or broken PDU (left side) or strut (right side) ball stud attachments. Repair or replace if required.
  2. Ineffective liftgate gas-charged strut (prop rod). 2. Check gas-charged strut (prop rod) on right side of liftgate. Replace if required.
HIGH OPENING EFFORT - LIFTGATE OPENS VERY SLOWLY DURING MANUAL OR POWER OPERATION 1. Power Liftgate System Inhibitors preventing operation. 1. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  2. Loose or damaged PDU or strut mounts. 2. Check for loose or broken PDU (left side) or strut (right side) ball stud attachments. Repair or replace if required.
  3. Ineffective liftgate gas-charged strut (prop rod). 3. Check gas-charged strut (prop rod) on right side of liftgate. Replace if required.
  4. Binding or sticking of components. 4. Establish location of binding or sticking components. Repair or replace if required.
  5. Wiring problems (system or vehicle). 5. Refer to the appropriate wiring information. Repair if required.
  6. Vehicle located on too steep of a grade for power liftgate operation. 6. Operate liftgate manually.
  7. Ineffective liftgate PDU. 7. Use a diagnostic scan tool to cycle the PDU. Replace if required.
LIFTGATE CONTINUES TO POWER-CLOSE AFTER REACHING FULL-CLOSED POSITION 1. Power Liftgate Input/Output status incorrect. 1. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  2. Wiring problems (system or vehicle). 2. Refer to the appropriate wiring information. Repair if required.
  3. Binding or sticking of components. 3. Establish location of binding or sticking components. Repair or replace if required.
  4. Ineffective power liftgate latch assembly. 4. Check for foreign matter or damaged components preventing proper latch operation. Use diagnostic scan tool to cycle the latch. Replace if required.
  5. Ineffective PLGM. 5. Test the PLGM using a diagnostic scan tool. Replace if required.
LIFTGATE CONTINUES TO POWER-OPEN AFTER REACHING FULL-OPEN POSITION - MAY PULSE SEVERAL TIMES 1. Power Liftgate Input/Output status incorrect. 1. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  2. Wiring problems (system or vehicle). 2. Refer to the appropriate wiring information. Repair if required.
  3. Ineffective full open switch (liftgate PDU). 3. Use a diagnostic scan tool to check the switch status and cycle the PDU. Replace if required.
  4. Ineffective PLGM. 4. Test the PLGM using a diagnostic scan tool. Replace if required.
SQUEAKS, NOISES AND RATTLES 1. Foreign material within liftgate panel. 1. Remove foreign material from within liftgate if required.
  2. Worn or loose liftgate components. 2. Inspect and tighten or replace loose liftgate components if required.
LIFTGATE UNLATCHES OR INITIATES POWER OPEN OR POWER CLOSE CYCLE UNEXPECTEDLY 1. Inadvertent power liftgate activation. 1. Use a diagnostic scan tool to read and record PLGM activation history.
  2. Power Liftgate System Inhibitors preventing operation. 2. Check Inhibit Monitors using a diagnostic scan tool. Refer to POWER LIFTGATE SYSTEM INHIBIT MONITORS  Repair if required.
  3. Power Liftgate Input/Output status incorrect. 3. Check power liftgate input - output status using a diagnostic scan tool. Refer to POWER LIFTGATE INPUT - OUTPUT TABLE  Repair if required.
  4. Wiring problems (system or vehicle). 4. Refer to the appropriate wiring information. Repair if required.
  5. Ineffective power liftgate overhead console switch. 5. Test the overhead console switch. Replace if required.
  6. Ineffective FOBIK. 6. Reprogram FOBIK and retry. Replace if required.
  7. Ineffective power liftgate latch assembly. 7. Check for foreign matter or damaged components preventing proper latch operation. Use diagnostic scan tool to cycle the latch. Replace if required.
  8. Ineffective PLGM. 8. Test the PLGM using a diagnostic scan tool. Replace if required.
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