System: Powertrain (P-Code)
SAE Standard (Generic)
Family: Engine Coolant Pressure Sensor Circuit
Code P05C6: Engine Coolant Pressure Sensor Circuit Intermittent/Erratic
Diagnostic & Technical Explanation
Code P05C6 (Engine Coolant Pressure Sensor Circuit Intermittent/Erratic) sets when the ECM sees an open, shorted, or implausible signal from the pressurized cooling system's coolant pressure sensor, used to detect low coolant/leaks in a sealed-loop cooling system. Causes are a failed sensor, a corroded connector, or an actual loss of system pressure from a coolant leak that also needs addressing.
First-listed procedure
Rank #1
Pressure-test cooling system for leaks
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: Engine Coolant Pressure Sensor 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)