Transmission Shift Solenoid Malfunction
The P0780 code indicates a shift malfunction in the automatic transmission. This typically means the powertrain control module (PCM) has detected an error in the shift solenoid circuit or the transmission is not shifting properly. Common causes include faulty shift solenoids, low or contaminated transmission fluid, wiring issues, or internal transmission damage.
01. Most Common Causes
- Faulty shift solenoid
- Low or dirty transmission fluid
- Wiring or connector issues in the solenoid circuit
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Harsh or erratic shifting
- Transmission slipping
- Check Engine Light illuminated
- Vehicle stuck in one gear or fails to shift
03. Step-by-Step Diagnosis
Step 1: Scan for additional codes and check freeze frame data.
Step 2: Inspect transmission fluid level and condition; top off or replace if necessary.
Step 3: Test shift solenoid resistance and power/ground circuits with a multimeter.
Step 4: Perform a transmission pressure test to identify internal issues.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the transmission may fail completely, leaving you stranded. Limited local driving may be possible if shifting is still functional, but immediate diagnosis is advised.
How much does it cost to fix?▼
Repair costs vary widely: replacing a shift solenoid can cost $150-$400 including labor, while a full transmission rebuild or replacement can exceed $2,000.