What Does P0786 Mean?
The TCM has detected that Shift Timing Solenoid A is operating outside its expected performance range. The solenoid is responding to commands but not achieving the desired timing accuracy for gear shifts. This range/performance code indicates the solenoid is mechanically degraded or operating in conditions (fluid contamination, excessive wear) that prevent precise timing control.
Common Causes
30%
Worn shift timing solenoid A with degraded mechanical response
25%
Contaminated or degraded transmission fluid reducing solenoid precision
20%
Valve body wear affecting the timing solenoid hydraulic circuit
15%
Internal transmission wear affecting shift timing feedback
10%
TCM adaptive values out of acceptable range
Diagnostic Steps
1
Check transmission fluid level and condition — degraded fluid is the primary cause of timing solenoid performance issues.
2
Monitor live data for shift timing solenoid A duty cycle and actual shift timing to quantify the performance deviation.
3
Perform a transmission fluid and filter service, reset adaptive values, and retest to see if performance improves.
4
If the issue persists after fluid service, inspect the valve body for wear in the timing solenoid bore.
5
Bench-test the timing solenoid for response accuracy and compare to new-solenoid specifications.
6
Check for TCM software updates that may recalibrate timing solenoid control parameters.
Estimated Repair Cost
$200 - $1,200
Parts + labor, varies by vehicle and location
The TCM has detected that Shift Timing Solenoid A is operating outside its expected performance range. The solenoid is responding to commands but not achieving the desired timing accuracy for gear shifts. This range/performance code indicates the solenoid is mechanically degraded or operating in con...
The most common cause of P0786 (Shift Timing Solenoid A Range/Performance) is: Worn shift timing solenoid A with degraded mechanical response
Typical repair costs for P0786 range from $200 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
The vehicle is drivable with slightly degraded shift quality. Shifts may feel slightly off in timing — not as smooth as expected. This is not an immediate safety concern but should be addressed to prevent progressive transmission wear.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0786 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
