Shift Solenoid E Stuck On
The P0772 code indicates that the transmission control module (TCM) has detected that shift solenoid E is stuck in the 'on' position. This solenoid controls hydraulic pressure to engage a specific gear. When stuck on, it can cause erratic shifting, harsh engagement, or transmission slippage. The issue is often due to electrical faults, contaminated transmission fluid, or mechanical failure within the solenoid.
1. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission stuck in a single gear
- Reduced fuel economy
2. Most Common Causes
- Faulty shift solenoid 'E' (mechanically stuck open)
- Short circuit to battery positive in the solenoid 'E' control circuit
- Internal solenoid driver failure in the TCM/PCM
- Stuck hydraulic control valve in the valve body
- Low transmission fluid level or contaminated fluid preventing plunger return
3. Step-by-Step Diagnosis
Step 1: Scan for codes and verify P0772 is present.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors to shift solenoid E for damage or corrosion.
Step 4: Test solenoid resistance with a multimeter; compare to manufacturer specs.
Step 5: If solenoid is faulty, replace it; if wiring is bad, repair as needed.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause further transmission damage. Limited driving to a repair shop is acceptable.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY solenoid replacement, but professional labor can increase the total to $200-$400.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.