What Does P07A8 Mean?
Transmission friction element "D" is not engaging properly or is stuck in the released (off) position. The TCM has detected that this clutch pack or band fails to apply when commanded, resulting in slipping or inability to achieve the intended gear ratio. This affects specific gear combinations that depend on element D for torque transfer. Symptoms typically include flare on shifts, RPM surges without corresponding acceleration, or delayed gear engagement.
Safety Warning
Driving is not recommended. A non-engaging friction element can cause sudden loss of drive power during acceleration or at highway speeds. The transmission may enter limp mode limiting the vehicle to one gear. Have the vehicle towed for diagnosis.
Common Causes
35%
Worn or burnt friction element D clutch pack with insufficient friction material remaining
25%
Low hydraulic pressure to friction element D due to valve body wear or blockage
20%
Defective shift or pressure control solenoid for element D apply circuit
12%
Servo piston seal failure allowing pressure bypass and insufficient clutch apply force
8%
Contaminated or degraded transmission fluid reducing clutch friction coefficient
Diagnostic Steps
1
Check transmission fluid level and condition for burnt odor, dark color, or particulate contamination indicating internal clutch wear.
2
Monitor gear ratio data via scan tool to identify which specific shift transitions show slipping when element D should be applied.
3
Perform line pressure tests at element D's apply circuit test port and compare against manufacturer specifications.
4
Command solenoid functional tests and monitor current draw patterns to verify the control solenoid for element D operates within spec.
5
Drop the transmission pan and inspect for excessive friction material, metallic debris, or clutch lining fragments.
Estimated Repair Cost
$1,800 - $4,500
Parts + labor, varies by vehicle and location
Transmission friction element "D" is not engaging properly or is stuck in the released (off) position. The TCM has detected that this clutch pack or band fails to apply when commanded, resulting in slipping or inability to achieve the intended gear ratio. This affects specific gear combinations that...
The most common cause of P07A8 (Transmission Friction Element "D" Performance/Stuck Off) is: Worn or burnt friction element D clutch pack with insufficient friction material remaining
Typical repair costs for P07A8 range from $1,800 to $4,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Driving is not recommended. A non-engaging friction element can cause sudden loss of drive power during acceleration or at highway speeds. The transmission may enter limp mode limiting the vehicle to one gear. Have the vehicle towed for diagnosis.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P07A8 to identify the root cause.
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Quick Info
Category
Powertrain
System
Automatic Transmission
Difficulty
Type
Generic (SAE)
Recommended Tools
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