Transmission Mode Switch Circuit Low
The P071E code indicates that the transmission control module (TCM) has detected a low voltage condition in the transmission mode switch circuit. This switch, often part of the manual shift lever assembly, tells the TCM which gear position (Park, Reverse, Neutral, Drive) is selected. A low circuit condition can be caused by a faulty switch, damaged wiring, or a poor electrical connection, leading to incorrect gear selection or transmission performance issues.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in limp mode or fails to shift properly
- Incorrect gear position indicated on dashboard
- Vehicle may not start or shift out of Park
2. Most Common Causes
- Faulty transmission mode switch
- Damaged or corroded wiring/connectors in the switch circuit
- Short to ground in the switch signal wire
- Failed transmission control module (TCM)
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Visually inspect the transmission mode switch and wiring for damage, corrosion, or loose connections.
Step 3: Test the switch resistance and voltage using a multimeter; compare to manufacturer specifications.
Step 4: Check for shorts to ground or open circuits in the wiring harness.
Step 5: If all else is fine, test the TCM for proper operation or replace if necessary.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as the transmission may not shift correctly or could get stuck in a gear, leading to unsafe driving conditions or further transmission damage.
How much does it cost to fix?▼
The cost to fix P071E typically ranges from $50 to $150 for diagnosis and repair, but can be higher if the TCM needs replacement.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.