Transmission Mode Switch Circuit Low
The P071E code indicates that the powertrain control module (PCM) has detected a low voltage condition in the transmission mode switch circuit. This switch tells the PCM which gear range (Park, Reverse, Neutral, Drive) the driver has selected. A low circuit can be caused by a faulty switch, damaged wiring, or a poor electrical connection. This may prevent the transmission from shifting properly or engaging the correct gear.
01. Most Common Causes
- Faulty transmission range switch
- Damaged or corroded wiring/connectors
- Low battery voltage or charging system issue
- PCM software or hardware failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in limp mode or one gear
- Incorrect gear display on dashboard
- Harsh or delayed shifting
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and freeze frame data.
Step 2: Visually inspect the transmission range switch and wiring for damage or corrosion.
Step 3: Test the switch resistance and voltage at the PCM connector per service manual.
Step 4: Check battery voltage and charging system output.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may not shift correctly, potentially causing unsafe driving conditions or further damage.
How much does it cost to fix?▼
Typically between $50 and $150 for diagnosis and replacement of the switch or repair of wiring, depending on labor rates and parts.