P07AA

Code

Generic P — Powertrain

Transmission Friction Element E Performance/Stuck Off

Brand: Generic

Type: P — Powertrain

Views: UK: 18 EN: 42 RU: 23

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Faulty or stuck shift/pressure control solenoid
Hydraulic valve or spool in valve body stuck or clogged
Low, dirty, or overheated transmission fluid
Internal hydraulic leak in the clutch pack or piston
Damaged clutch pack, piston, or seals
Wiring or connector fault to solenoid or pressure sensor

Symptoms

Malfunction Indicator Lamp (MIL) illuminated
No torque converter lockup or a clutch pack failing to engage
Harsh, delayed, or slipping shifts
Reduced fuel economy and drivability
Transmission may fail to hold a gear under load
Possible limp-home mode or reduced performance

What to check

Read and record all transmission-related DTCs and freeze frame data with a scan tool
Visual inspection of transmission fluid level, color, smell and contamination
Check transmission fluid temperature when running tests (perform some tests at normal operating temp)
Inspect wiring harness and connectors for damage, corrosion, or poor pins to the suspected solenoid/pressure sensor
Monitor live data: solenoid duty cycles, requested vs actual clutch status, line pressure, input and output speeds
Measure solenoid coil resistance and compare to spec

Signal parameters

Commanded solenoid duty cycle (%)
Actual solenoid current (A) or resistance (Ω)
Transmission line pressure (kPa or psi)
Clutch apply pressure (kPa or psi) or accumulator pressure
Torque converter clutch (TCC) commanded/actual (on/off)
Input (turbine) speed (RPM)

Diagnostic algorithm

Retrieve freeze frame and all stored codes. Note conditions when fault set (temp, gear, load).
Visually inspect transmission fluid level and condition. Top up or replace if low/contaminated. Clear codes and retest.
Inspect wiring and connectors for the affected solenoid(s) and pressure sensors. Repair any damage and check for secure connections.
Using a scan tool, monitor commanded vs actual solenoid duty/current and clutch status while reproducing the symptom. Look for lack of response or abnormal values.
Measure solenoid coil resistance at the connector (engine off). Compare to spec; check for short to ground or open circuit.
Perform a controlled solenoid actuation test with a bi-directional scan tool (if available). Confirm valve movement and response in live data.
Conduct a hydraulic line pressure test at idle and during commanded apply. Compare to specifications to identify low pressure or failure to build pressure.
If electrical and pressure checks are good but the element still does not engage, remove and inspect valve body/solenoid assembly for sticking spools, debris, or worn components. Clean or replace as required.
Inspect clutch pack, piston, and seals for wear or leaks if internal pressure loss is suspected. Replace worn hydraulic components or friction elements as necessary.
After repairs, clear codes, perform road test and recheck live data and for reappearance of the code. Update TCM/PCM software if a manufacturer update is available and relevant.

Likely causes

Solenoid electrical fault (open, short, poor ground, corroded connector)
Valve body contamination restricting spool movement
Low line pressure due to pump wear or external/internal leaks
Clutch friction material worn or piston seals leaking
Incorrect solenoid duty cycle from TCM (software or TCM fault)
Fluid degraded causing slow apply or drag on friction element

Fault status

⚠️ Status

Transmission friction element commanded ON but did not engage (Performance/Stuck Off). Verify solenoid, hydraulic pressure, fluid condition, and valve body integrity.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 1-3 hours