Auto Shift Manual Control Circuit Malfunction
The P0950 code indicates a fault in the automatic transmission's manual shift control circuit. This circuit allows the driver to manually select gears in an automatic transmission. The powertrain control module (PCM) detects an abnormal voltage or signal from the manual shift control switch or its wiring, preventing proper manual shift operation.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Inability to manually shift gears
- Transmission stuck in a single gear or limp mode
- Erratic shifting behavior
2. Most Common Causes
- Faulty manual shift control switch
- Damaged wiring or connectors in the shift control circuit
- Corrosion or poor electrical connections
- Failed PCM (rare)
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm P0950 and check for other codes.
Step 2: Visually inspect the manual shift control switch and wiring for damage or corrosion.
Step 3: Test the switch and circuit with a multimeter for proper voltage and continuity.
Step 4: If wiring and switch are okay, check PCM for faults or reprogramming needs.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it may cause unpredictable shifting or transmission damage. Limp mode may limit speed and drivability.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the switch, wiring, or PCM needs replacement. Labor and parts vary by vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.