What Does P0919 Mean?
The TCM has detected a gear shift position control error, meaning the actual shift fork position does not match the TCM's commanded gear position. The TCM commanded a forward or rearward shift but the position sensor feedback indicates the mechanism did not reach the target gear. This is a closed-loop control error rather than a simple sensor or circuit fault.
Safety Warning
Failure to fully engage gears can cause the transmission to pop out of gear under load or fail to engage entirely. Do not drive; this is a serious safety concern.
Common Causes
35%
Shift actuator mechanical binding or worn shift forks preventing full gear engagement
25%
Shift actuator motor losing strength, unable to fully engage gears
20%
Gear shift position sensor calibration drift giving false position feedback
20%
Worn synchronizer rings requiring excessive force for gear engagement
Diagnostic Steps
1
Step 1: Using a bidirectional scan tool, command each gear individually and compare the commanded position vs. actual position sensor reading — note which gears show the largest error.
2
Step 2: Measure the shift actuator motor current draw during gear engagement — compare to specification; high current indicates mechanical resistance; low current indicates a weak motor.
3
Step 3: Disconnect the shift actuator and manually attempt to engage each gear through the shift rail — excessive resistance indicates worn synchros, damaged shift forks, or internal transmission issues.
4
Step 4: Verify the gear shift position sensor calibration by checking output at known mechanical positions.
5
Step 5: If internal transmission damage is suspected (worn synchros, damaged forks), a transmission teardown inspection may be required.
Estimated Repair Cost
$300 - $3,000
Parts + labor, varies by vehicle and location
The TCM has detected a gear shift position control error, meaning the actual shift fork position does not match the TCM's commanded gear position. The TCM commanded a forward or rearward shift but the position sensor feedback indicates the mechanism did not reach the target gear. This is a closed-lo...
The most common cause of P0919 (Gear Shift Position Control Error) is: Shift actuator mechanical binding or worn shift forks preventing full gear engagement
Typical repair costs for P0919 range from $300 to $3,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Failure to fully engage gears can cause the transmission to pop out of gear under load or fail to engage entirely. Do not drive; this is a serious safety concern.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0919 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automated Manual Transmission (Shift Control)
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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