P27A0
Four Wheel Drive (4WD) Range Signal Circuit High
Voltage on the 4WD range signal line is above the expected window. Wiring faults of this kind typically come from chafing, water ingress at connector seals, or pin push-back — a wiggle test on the harness while the code is active often confirms the location.
- Check engine light: Yes
- Emissions related: No
- Repair difficulty: medium
Common causes
Ordered by how often each turns out to be the cause.
- Signal wire shorted to B+Common
- Open sensor elementPossible
- Connector pins corroded - high contact resistanceLess likely
Parts involved
- Four Wd Range Sensor
- Wiring Harness
P27A0 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.