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 (e.g., via paddle shifters or a manual mode on the shifter). The Powertrain Control Module (PCM) detects an abnormal voltage or signal from the manual shift control switch or related wiring, preventing proper manual gear selection.
01. Most Common Causes
- Faulty manual shift control switch
- Damaged wiring or connectors in the manual shift circuit
- Corroded or loose electrical connections
- Faulty PCM (rare)
02. Symptoms You Will Notice
- Inability to manually shift gears
- Transmission stuck in automatic mode
- Check Engine Light illuminated
- Transmission may default to a fail-safe mode
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the manual shift control switch and wiring for damage or corrosion.
Step 3: Test the manual shift control switch resistance and continuity per manufacturer specs.
Step 4: Check for voltage and ground at the switch connector; repair as needed.
Step 5: If all else is fine, test the PCM for proper signal reception.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but you will lose manual shift capability. The transmission will operate in automatic mode. However, if the transmission enters fail-safe mode, it may limit speed and gear range, so have it diagnosed soon.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on whether it's a simple wiring fix or switch replacement. Labor rates vary by shop.