Gear Shift Position Control Error
The P0919 code indicates a malfunction in the gear shift position control system, which includes the shift-by-wire actuator, transmission control module (TCM), or related wiring. This system is responsible for detecting the selected gear position and ensuring proper engagement. When the TCM detects an inconsistency between the commanded and actual gear position, it sets this code. This can lead to erratic shifting, failure to shift, or transmission stuck in a gear.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in one gear or fails to shift
- Erratic or harsh shifting
- Vehicle may not start or shift out of Park
2. Most Common Causes
- Faulty or misadjusted gear shift position switch
- Short, open, or poor connection in shift position sensor wiring or connectors
- Mechanical issues in shift linkage (bent, stretched, or broken cable or rod)
- Low transmission fluid level or degraded fluid condition
- Failed transmission control module (TCM) or PCM (rare)
- Defective shift solenoid or transmission actuator
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Inspect the shift-by-wire actuator and its wiring for damage, corrosion, or loose connections.
Step 3: Check transmission fluid level and condition; top off or replace if necessary.
Step 4: Test the actuator and TCM using a multimeter or scan tool per manufacturer specifications.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
No, it is not safe. The transmission may fail to shift properly, causing loss of power or unexpected vehicle movement, which can lead to an accident.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repair costs vary: a shift actuator replacement can be $200-$600, while TCM replacement may exceed $1000.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.