Transmission Control System Range/Performance
The P0701 code indicates that the Transmission Control Module (TCM) has detected a malfunction in the transmission control system's range or performance. This typically means the TCM is receiving signals from sensors (like the transmission range sensor or speed sensors) that are out of expected parameters, or the TCM itself is failing to properly control shift solenoids or other actuators. This can lead to erratic shifting, limp mode, or transmission damage if ignored.
01. Most Common Causes
- Faulty transmission range sensor (TRS) or neutral safety switch
- Wiring or connector issues in the transmission control circuit
- Failed shift solenoids or internal transmission mechanical problems
- Defective Transmission Control Module (TCM) or PCM
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Transmission stuck in limp mode (e.g., only 2nd gear)
- Harsh or delayed shifting
- Vehicle may not shift properly or at all
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and record freeze frame data.
Step 2: Inspect transmission fluid level and condition; check for leaks.
Step 3: Test the transmission range sensor and its circuit for proper voltage and continuity.
Step 4: Check wiring and connectors for damage, corrosion, or loose connections.
Step 5: If all else is okay, test the TCM/PCM and replace if necessary.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. The transmission may enter limp mode, limiting speed and potentially causing further damage. Have it diagnosed promptly.
How much does it cost to fix?▼
Diagnosis typically costs $50-$150. Repairs vary: a range sensor replacement can be $100-$300, while a TCM replacement may cost $500-$1000 or more.