Auto Shift Manual Control Circuit Range/Performance
The P0951 code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the auto shift manual control circuit, which is responsible for allowing the driver to manually select gears in an automatic transmission. This circuit includes the shift lever position sensor, wiring, and the PCM itself. The 'Range/Performance' aspect means the signal from the sensor is outside the expected range or the circuit performance is degraded, often due to electrical issues or mechanical wear.
01. Most Common Causes
- Faulty shift lever position sensor
- Damaged or corroded wiring/connectors in the manual shift circuit
- Malfunctioning PCM
02. Symptoms You Will Notice
- Inability to manually shift gears
- Transmission stuck in a single gear or limp mode
- Check Engine Light illuminated
03. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the shift lever wiring and connectors for damage or corrosion.
Step 3: Test the shift lever position sensor resistance and voltage per manufacturer specs.
Step 4: If sensor and wiring are okay, check for PCM software updates or replace PCM.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as the transmission may not shift properly, potentially causing unsafe driving conditions or further damage.
How much does it cost to fix?▼
Typically $50-$150 for diagnosis and repair, but costs can vary if the PCM needs replacement.