Fault Family System: Powertrain (P-Codes) 7 SAE Codes

Transmission Control System Circuit

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.

These 7 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 7 times.

Codes in this family (7)

Code	Definition	Repair coverage
P0700	Transmission Control System (MIL Request)	3 ranked fixes
P0701	Transmission Control System Range/Performance	3 ranked fixes
P0702	Transmission Control System Electrical	3 ranked fixes
P07FF	Cold Start Transmission Performance	3 ranked fixes
P0802	Transmission Control System MIL Request Circuit/Open	3 ranked fixes
P0898	Transmission Control System MIL Request Circuit Low	3 ranked fixes
P0899	Transmission Control System MIL Request Circuit High	3 ranked fixes

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)

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