Can you keep driving?
Can you keep driving?
Stop driving if any of these apply
- !The transmission slips, bangs into gear, or will not shift correctly.
- !The vehicle loses drive, enters limp mode, or the warning light is paired with obvious transmission trouble.
What to check first
Step-by-step checks
- 1
Free - no tools
Check the transmission connector and harness for damage or fluid intrusion
- 2
Free - no tools
Check the transmission fluid level and condition before replacing parts
- 3
Basic tool needed
Notice whether shifts are harsh, delayed, or slipping with the code
- 4
Basic tool needed
If scan data is available, compare commanded line-pressure behavior with how the transmission actually shifts
- 5
Basic tool needed
Treat other transmission codes as part of the same diagnosis rather than separate one-off faults
If the code returns
- -If the circuit checks out but the problem stays, the solenoid or valve-body side becomes more likely.
- -If the code returns after connector repair, look again under heat and load.
- -If the transmission is slipping or banging into gear, do not treat it like a minor electrical nuisance.
Background
What this code means
P0745 is a generic OBD-II code for the torque converter clutch circuit or performance path.
Treat it as a starting point rather than a guaranteed converter replacement. Upstream engine-running faults, fluid issues, wiring, or valve-body control problems can all influence the result.
Diagnosis
Common causes
Pressure control solenoid fault
The solenoid may not regulate pressure the way the ECU expects.
Valve-body hydraulic issue
Hydraulic leakage or sticking can mimic a bad solenoid.
Connector or harness issue
A poor connection can interrupt the control signal.
Fluid or pressure problem
Low or degraded fluid can drive the pressure-control test out of range.
Avoid these mistakes
What not to do
- xDo not assume the converter is dead before checking for engine-running faults, fluid condition, or related transmission codes.
- xDo not keep driving if the transmission starts slipping, shuddering badly, or failing to stay in gear.
Parts
Parts that may need replacing
See also
Related OBD codes
Source notes
Generic OBD-II (SAE J1979 / ISO 15031-5). P0745 was expanded around pressure control solenoid faults, including hydraulic, wiring, and fluid-related issues.
This guide is written as a generic multi-make reference, so bulletin history, sensor locations, and repair order can still change by manufacturer and engine family.
This is generic OBD-II guidance and should not override vehicle-specific service information. Exact diagnosis and repair steps vary by make, engine family, and model year.
Last reviewed: 2026-04-10
Reference: Open reference