What Does P099F Mean?
The TCM has detected that the shift solenoid 'H' control circuit is reading high, indicating an open circuit, disconnected solenoid, or short to battery voltage. Without proper solenoid control, the transmission cannot engage the gear associated with solenoid H, potentially resulting in limp mode or limited gear selection.
Common Causes
35%
Open circuit in shift solenoid H coil winding
25%
Broken wire or open connection in the solenoid H harness
25%
Disconnected or damaged connector at the transmission case or TCM
15%
Short to battery voltage in the control wire
Diagnostic Steps
1
Step 1: Measure solenoid H resistance at the transmission case connector. OL reading confirms a burned-out solenoid requiring replacement.
2
Step 2: If solenoid resistance is within spec (10-25 ohms), verify wire continuity from the transmission connector to the TCM. Both control and ground wires should read under 1 ohm.
3
Step 3: Inspect all connectors in the circuit for backed-out pins, broken locking tabs, or terminal corrosion. Reseat and verify engagement.
4
Step 4: With the solenoid disconnected, check for any unexpected voltage on the control wire that would indicate a short to a power source.
5
Step 5: Command solenoid H via bidirectional controls and monitor current draw. Zero current with a good solenoid indicates an open between the TCM and the solenoid.
Estimated Repair Cost
$200 - $850
Parts + labor, varies by vehicle and location
The TCM has detected that the shift solenoid 'H' control circuit is reading high, indicating an open circuit, disconnected solenoid, or short to battery voltage. Without proper solenoid control, the transmission cannot engage the gear associated with solenoid H, potentially resulting in limp mode or...
The most common cause of P099F (Shift Solenoid "H" Control Circuit High) is: Open circuit in shift solenoid H coil winding
Typical repair costs for P099F range from $200 to $850, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Affected gear will not engage; limp mode is likely. Vehicle can be driven short distances at reduced speed. Schedule repair immediately.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P099F to identify the root cause.
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Quick Info
Category
Powertrain
System
Transmission Shift Control
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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