Fault Family System: Powertrain (P-Codes) 18 SAE Codes

Turbo Boost Sensor Circuit

Diagnostic & Technical Explanation

Code P0235 (Turbocharger/Supercharger Boost Sensor A Circuit) sets when the ECM sees an open, shorted, out-of-range, or erratic signal from the turbo/supercharger boost pressure sensor. Causes are a failed sensor element, an oil-fouled or blocked pressure port, or damaged sensor wiring.

These 18 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 18 times.

Codes in this family (18)

Code	Definition	Repair coverage
P0235	Turbocharger/Supercharger Boost Sensor A Circuit	3 ranked fixes
P0236	Turbocharger/Supercharger Boost Sensor A Circuit Range/Performance	3 ranked fixes
P0237	Turbocharger/Supercharger Boost Sensor A Circuit Low	3 ranked fixes
P0238	Turbocharger/Supercharger Boost Sensor A Circuit High	3 ranked fixes
P0239	Turbocharger/Supercharger Boost Sensor B Circuit	3 ranked fixes
P0240	Turbocharger/Supercharger Boost Sensor B Circuit Range/Performance	3 ranked fixes
P0241	Turbocharger/Supercharger Boost Sensor B Circuit Low	3 ranked fixes
P0242	Turbocharger/Supercharger Boost Sensor B Circuit High	3 ranked fixes
P025E	Turbocharger/Supercharger Boost Sensor A Intermittent/Erratic	3 ranked fixes
P025F	Turbocharger/Supercharger Boost Sensor B Intermittent/Erratic	3 ranked fixes
P25F2	Turbocharger/Supercharger Boost Sensor C Circuit	3 ranked fixes
P25F3	Turbocharger/Supercharger Boost Sensor C Circuit Range/Performance	3 ranked fixes
P25F4	Turbocharger/Supercharger Boost Sensor C Circuit Low	3 ranked fixes
P25F5	Turbocharger/Supercharger Boost Sensor C Circuit High	3 ranked fixes
P2CD6	Turbocharger/Supercharger Boost Sensor D Circuit	3 ranked fixes
P2CD7	Turbocharger/Supercharger Boost Sensor D Circuit Range/Performance	3 ranked fixes
P2CD8	Turbocharger/Supercharger Boost Sensor D Circuit Low	3 ranked fixes
P2CD9	Turbocharger/Supercharger Boost Sensor D 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)

Need All 15,886 Codes as Data?

Pipe-delimited CSV, Apache Parquet and a relational SQLite database, with commercial application rights and instant download. Built for scan tools, shop software and research - not assembled one web page at a time.

License OEM Complete · $149 Standard (SAE only) · $49

$49 Standard: 9,249 SAE codes · $149 OEM Complete: all 15,886 codes, including 6,637 OEM codes across 32 makes · $149 Heavy Duty: 4,212 fault pairs (J1939) · one-time · compare tiers