P0952: Auto Shift Manual Control Circuit Low
The P0952 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the auto shift manual control circuit, which is responsible for communicating the driver's manual shift commands (e.g., paddle shifters or manual mode selector) to the transmission control module. This circuit typically operates at a reference voltage of 5V; when the signal voltage drops below the expected threshold (usually below 0.5V), the PCM sets this code. Common causes include a short to ground in the wiring, a faulty shift selector or paddle shifter, a damaged connector, or a malfunctioning PCM.
01. Most Common Causes
- Short to ground in the auto shift manual control circuit wiring
- Faulty shift selector or paddle shifter assembly
- Corroded or damaged connector in the circuit
- Failed PCM (rare)
02. Symptoms You Will Notice
- Transmission stuck in automatic mode; manual shift function inoperative
- Check Engine Light illuminated
- Reduced fuel economy or performance
- Transmission may shift erratically or default to a limp mode
03. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm P0952 and check for related codes.
Step 2: Visually inspect the wiring and connectors for damage, corrosion, or loose connections.
Step 3: Test the circuit voltage at the shift selector/paddle shifter connector; should be near 5V with key on.
Step 4: If voltage is low, isolate the short by disconnecting components and checking resistance to ground.
Step 5: Replace the faulty component (selector, paddle, or wiring) and clear the code.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is generally safe to drive, but the manual shift function will be disabled. The transmission will operate in automatic mode, which may affect performance. It's best to diagnose and repair promptly to avoid potential transmission issues.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for diagnosis and repair, depending on the cause. If the shift selector or paddle shifter needs replacement, parts can add $100-$300. Labor is usually 1-2 hours.