System: Powertrain (P-Code)
SAE Standard (Generic)
Family: PCM Internal Processor Fault
Code P0606: Control Module Processor
Diagnostic & Technical Explanation
Code P0606 (Control Module Processor) sets when a control module's (ECM, PCM, or TCM) internal self-test finds its memory (RAM/ROM/EEPROM/NVRAM/checksum), processor, or an internal signal-processing channel is not functioning correctly. Unlike a sensor circuit fault, this points at the module's own hardware, so the fix path is reflashing the module's software first and, if the fault returns, replacing the module rather than chasing external wiring.
First-listed procedure
Rank #1
Verify battery/charging voltage before further diagnosis
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: PCM Internal Processor Fault
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)