System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Transmission Control System Circuit
Code P0700: Transmission Control System (MIL Request)
Diagnostic & Technical Explanation
Code P0700 (Transmission Control System (MIL Request)) sets when the TCM's overall self-check strategy — as opposed to any single sensor — requests the MIL, finds an electrical fault on its main harness, or judges its adaptive shift strategy is out of range. Causes are low or contaminated transmission fluid, a TCM software issue, an aftermarket electrical accessory disrupting the TCM's power/ground, or a wiring fault on the main TCM harness connector.
First-listed procedure
Rank #1
Check transmission fluid level and condition
Easy DIY
This is the first procedure in the authored
consideration order, not a measured cause likelihood. Execute it only when its prerequisites
and diagnostic findings support it. Its cost and labor estimates (where known), the step-by-step procedure and the
remaining 2 procedure(s) are in the licensed dataset. Ordering context.
Full family: Transmission Control System Circuit
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)