Fault Family
System: Powertrain (P-Codes)
1 SAE Codes
Trans Fluid Thermostat Performance
Diagnostic & Technical Explanation
Code P07CB (Transmission Fluid Thermostat Performance) sets when the transmission fluid thermostat/bypass valve fails to regulate fluid temperature into its expected warm-up curve, keeping fluid too cold (or too hot) for normal shift-quality control. Causes are a thermostat/bypass valve stuck open or closed, or a failed cooler bypass valve restricting flow through the transmission cooler.
These 1 diagnostic trouble codes share one
detection mechanism and one repair path, which is why MechanicDB groups them into a single
authored fault family rather than repeating the same explanation 1 times.
What this page does not show
This page publishes the fault mechanism and the code index. The licensed dataset adds, for
every one of the 15,886 codes, the full authored repair set (56,729 procedures in total)
with the fields deliberately withheld here:
- Procedures 2..n after the first-listed procedure
- Aftermarket parts cost ranges in USD (
est_parts_cost_min/max_usd)
- Professional labor-hour estimates (
est_labor_hours)
- Step-by-step diagnostic and repair instructions
- Replacement-part mappings and catalog lookups
- 6,637 manufacturer-specific OEM codes across 32 makes ($149 tier)