Pinpoint Test B : DTC P187B: Notes
WARNING: This page is about a different car, the 2018 Ford Edge. However, it is still accessible from the selected car via links, so may be relevant.
DTC P187B
Normal Operation and Fault Conditions
The AWD system uses input data from the ABS module wheel speed sensor inputs to the PCM. A dissimilar spare tire size (other than the spare tire provided) or major dissimilar tire sizes or improperly inflated tires between the front and rear axles could cause the AWD system to stop functioning correctly.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Conditions |
|---|---|---|
| P187B | Tire Size Out of Acceptable Range - AWD Disabled/Limited Function | When the PCM detects an inappropriate size wheels/tires (greater than 5% difference in size across the front and rear axle or greater than 14% difference in size at one wheel on either the front or rear axle) installed. |
Possible Causes
- Wiring, terminals or connectors
- Wheels/tires
- ABS system
Visual Inspection and Diagnostic Pre-checks
- Inspect for correct tire size and inflation.
WARNING:
When directed to drive the vehicle as part of this test, drive the vehicle on a hard surface in an area without traffic to prevent a crash. Failure to follow these instructions may result in personal injury.