Transmission Transfer Case Counter Clockwise Shift Relay Coil Short Circuit To Battery
The transmission's counter-clockwise shift relay coil has shorted directly to battery voltage, causing excessive current flow. Think of it like a light switch that's stuck in the 'on' position, draining power continuously.
The ECU monitors the relay coil circuit voltage and resistance during shift commands. When the coil shorts to battery voltage, the circuit current exceeds normal operating thresholds, triggering a fault condition. The ECU detects this abnormal electrical signature and sets the code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Relay coil voltage | 12V pulse during shift, controlled current draw | Continuous 12V or excessive current detected |
| Circuit resistance | 80-120 ohms coil resistance | Near-zero resistance indicating short to battery |
Code P1835 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1835 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.