Fault Family System: Powertrain (P-Codes) 4 SAE Codes

Upshift Skip Shift Solenoid Circuit

Diagnostic & Technical Explanation

Code P0803 (Upshift/Skip Shift Solenoid Control Circuit) sets when the TCM detects an open circuit, out-of-range voltage, or an implausible signal while driving the skip-shift (1-4 upshift) solenoid used on manual transmissions to force an early upshift for fuel economy compliance. Causes are a failed solenoid coil, a corroded connector, or damaged control wiring.

These 4 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 4 times.

Codes in this family (4)

Code	Definition	Repair coverage
P0803	Upshift/Skip Shift Solenoid Control Circuit	4 ranked fixes
P080B	Upshift/Skip Shift Solenoid Control Circuit Range/Performance	4 ranked fixes
P080C	Upshift/Skip Shift Solenoid Control Circuit Low	4 ranked fixes
P080D	Upshift/Skip Shift Solenoid Control Circuit High	4 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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