Shift Timing Solenoid A Range/Performance
The P0786 code indicates that the Powertrain Control Module (PCM) has detected a malfunction in the shift timing solenoid A circuit. This solenoid controls hydraulic pressure to engage and disengage clutches and bands for gear shifts. The 'range/performance' aspect means the solenoid's response time or electrical characteristics are outside expected parameters, often due to internal wear, contamination, or electrical issues.
01. Most Common Causes
- Faulty shift solenoid A
- Low or contaminated transmission fluid
- Wiring or connector issues in solenoid circuit
- Internal transmission mechanical failure
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Harsh or delayed shifts
- Transmission slipping
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Check transmission fluid level and condition; top off or replace if necessary.
Step 3: Inspect wiring and connectors for damage, corrosion, or loose connections.
Step 4: Test solenoid A resistance and operation using a multimeter and scan tool.
Step 5: If solenoid is faulty, replace it; if wiring is bad, repair as needed.
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 it can cause further transmission damage and unsafe driving conditions.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, including parts and labor, depending on the vehicle and shop rates.