What does it mean?
B1888 is a Body (airbags, seat belts, body electronics) fault code. It indicates: Power Liftgate Pinch Sensor 1 Circuit Low .
Symptoms
- Power liftgate refuses to operate and must be used manually
- Gate reverses immediately after it starts to close, as if something were trapped
- System beeps repeatedly when the close button or handle is used
- Fault may be worse after rain or a car wash
- Hands free or foot activated opening stops working while the code is present
Likely causes
- Pinch sensor strip cut, crushed or pierced along the edge of the liftgate opening
- Water inside the strip terminator or its connector shorting the signal to ground
- Lead chafed where it flexes at the liftgate hinge or grommet
- Corroded connector at the strip after a rear seal or tail lamp gasket leak
- Terminating resistor failed short or the wrong resistor fitted after a repair
- Signal wire shorted to ground where the harness passes a bracket
- Liftgate control module input circuit fault
How to fix it
- Read the module codes and note which pinch sensor circuit is reported, since most gates have one per side
- Inspect the full length of the rubber pinch strip for cuts, crush marks, staples or trim clips driven through it
- Unplug the strip and measure its end to end resistance and its resistance to ground, comparing with the opposite side strip
- Check for water in the connector and the strip terminator, dry them and reassess
- Flex the lead at the hinge and grommet while monitoring the circuit to catch an intermittent short
- Verify the terminating resistor value against specification, especially if the gate has been repaired before
- Consider the liftgate control module only when the strip and harness both test correctly