Car Codes diagnostic trouble code
This bulletin announces availability of a new CVT electric oil pump developed to address DTC P173B: ELECTRIC FLUID PUMP (CVT) PERFORMANCE. The related customer concern describes the Auto Start Stop warning lamp flashing and the system becoming inoperative under certain circumstances. When Auto Start/Stop is inoperative, the vehicle operates like a traditio…
Code interpretation
What P173B means
This code indicates Vehicle fault code with verified manufacturer evidence Its precise meaning depends on the reporting control module, complete failure-type suffix, model year, powertrain and software level.
Driver experience
Symptoms you may notice
A stored diagnostic trouble code or a related system warning.
Test, do not guess
Possible causes
The precise cause depends on the reporting module, vehicle specification, circuit condition and software level.
Evidence-led checks
Recommended diagnostic route
Save the complete scan and confirm the code against model-specific technical information before testing.
- Capture the evidenceSave the complete all-module scan, code suffixes and freeze-frame data.
- Prove the basicsTest battery condition, system voltage, power and grounds.
- Identify the reporterConfirm the module that logged the code and check circuit integrity.
- Compare live dataReview commanded and actual values under the conditions that set the code.
- Test before replacingUse model-specific wiring diagrams, pin tests and technical information.
- Verify the repairClear the code only after recording evidence, then confirm it does not return.
Vehicle fitment
Vehicle applicability
Subaru Forester
Before clearing
Can the code be cleared?
Clearing a code without fixing the cause removes useful evidence and may only switch the warning off temporarily. Save the full scan first; a permanent or repeatedly returning code needs testing.
Confirm the suffix, reporting module, model, year, engine and live data before replacing a component.
Verified public evidence
Manufacturer and model coverage
1 public manufacturer record match this search. These records support applicability research but do not replace VIN-specific workshop information.
FORESTER · 2019 · Powertrain
This bulletin announces availability of a new CVT electric oil pump developed to address DTC P173B: ELECTRIC FLUID PUMP (CVT) PERFORMANCE. The related customer concern describes the Auto Start Stop…
Source