What it means
Same as P05E3 with the signal shorted to supply. 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.
At a glance
- Usually lights the check-engine light
How it works
The park-brake switch or position sensor reports brake status through a signal circuit monitored by the control module. This high-circuit code sets when the signal voltage is higher than expected, often because the signal is shorted to a supply or the circuit connection is faulty.
Common causes
Most likely first.
- Signal shorted to supply
- Connector pins corroded - high contact resistance
- Supply wire pinched against B+ source
Symptoms
- Park-brake warning light or message may behave incorrectly
- Check-engine or brake warning light may illuminate
How to diagnose it
- Save freeze-frame data and monitor live park-brake status while applying and releasing the brake to confirm the signal remains high.
- Inspect the sensor connector for corrosion, damaged terminals, or pins pushed back, and check for signs of water ingress.
- Follow the signal wire and look for chafing or pinching where it could contact a supply wire or other powered circuit.
- Using the wiring diagram and the specified isolation procedure, test for a short to supply and compare readings with the manufacturer's specification.
- If the wiring is intact, test the switch or sensor and circuit connections against the manufacturer's specification.
Common fixes
- Secure a loose park-brake sensor connector.
- Clean or repair corroded or damaged connector terminals.
- Repair the signal wire where it is pinched or shorted to a supply.
- Replace a park-brake switch or position sensor that fails testing.
Can I keep driving?
The park-brake status may be wrong, so verify the brake is fully released before driving and do not rely on hill-hold or stop-start to indicate its state. Stop if the brake warning stays on or you feel the brake dragging.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.