What Does P0997 Mean?
The TCM has detected that shift solenoid 'F' is not performing within its expected control range. The solenoid's actual response (current draw or pressure output) does not match the commanded value. This solenoid is responsible for controlling fluid flow to a specific clutch pack, and a range/performance issue results in degraded shift quality.
Common Causes
35%
Shift solenoid F sticking or sluggish due to contaminated transmission fluid or internal wear
25%
Restricted or blocked fluid passages to solenoid F valve body bore
20%
Wiring resistance in solenoid F circuit causing incorrect current delivery
20%
Worn valve body bore or solenoid seal allowing pressure bypass
Diagnostic Steps
1
Step 1: Check transmission fluid level and condition. Dark, burnt, or debris-laden fluid is a strong indicator of internal contamination affecting solenoid performance. A fluid and filter change may be the first step.
2
Step 2: Monitor shift solenoid F commanded duty cycle vs. actual pressure PID in live data during various driving conditions. A significant discrepancy confirms the performance issue.
3
Step 3: Measure solenoid F resistance at the transmission case connector (typically 10-25 ohms depending on manufacturer). Values outside specification indicate a faulty solenoid.
4
Step 4: Drop the transmission pan and inspect for excessive metallic debris, clutch material, or sludge. Inspect the solenoid F for physical damage or blockage at the filter screen.
5
Step 5: If solenoid resistance is in spec but performance is still off, remove the valve body and inspect the solenoid F bore for scoring, wear, or stuck check balls.
Estimated Repair Cost
$200 - $900
Parts + labor, varies by vehicle and location
The TCM has detected that shift solenoid 'F' is not performing within its expected control range. The solenoid's actual response (current draw or pressure output) does not match the commanded value. This solenoid is responsible for controlling fluid flow to a specific clutch pack, and a range/perfor...
The most common cause of P0997 (Shift Solenoid "F" Control Circuit Range/Performance) is: Shift solenoid F sticking or sluggish due to contaminated transmission fluid or internal wear
Typical repair costs for P0997 range from $200 to $900, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Harsh, delayed, or flared shifts may occur. The transmission may enter limp mode. Avoid heavy towing or aggressive driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0997 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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