What does it mean?
C1507 is a Chassis (ABS, traction control, steering) fault code. It indicates: Left Rear Tire Pressure Trigger Module Performance .
Symptoms
- Tyre pressure system fault message with the warning lamp lit
- Left rear position missing from the display or shown with dashes
- Wheel positions displayed in the wrong order after a tyre rotation
- Relearn fails at the rear of the vehicle
- No genuine pressure loss in the tyres
Likely causes
- Trigger module failure at the left rear wheel arch
- Corroded or water filled connector at the trigger module, common at the rear where spray collects
- Damaged wiring between the trigger module and the receiver, often chafed against a body seam
- Poor ground connection for the trigger circuit
- Module dislodged or refitted incorrectly after suspension, exhaust or liner work
- Left rear wheel sensor with a weak battery that responds inconsistently
- Receiver module fault or an incomplete configuration after replacement
How to fix it
- Attempt a relearn and observe at which wheel the procedure fails
- Trigger the left rear sensor with a TPMS tool to confirm it still transmits and has battery life
- Inspect the rear wheel arch for a damaged, wet or unplugged trigger module
- Measure power, ground and signal at the trigger module connector
- Test the wiring back to the receiver for open circuits, shorts and corrosion
- Verify the receiver module configuration if it or the trigger module was recently replaced
- Replace the trigger module, redo the relearn and confirm all positions report correctly