Fault Family System: Powertrain (P-Codes) 14 SAE Codes

Crank Position Sensor Circuit

Diagnostic & Technical Explanation

Code P0320 (Ignition/Distributor Engine Speed Input Circuit) sets when the ECM sees an open circuit, out-of-range voltage, no signal, or an erratic pulse pattern from a crankshaft position sensor (or, on older distributor-based ignition systems, the distributor's engine-speed pickup that serves the same function). Common causes are a sensor with too large an air gap to the reluctor wheel, metal debris bridging the sensor tip, a corroded connector, or chafed wiring between the sensor and the ECM.

These 14 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 14 times.

Codes in this family (14)

Code	Definition	Repair coverage
P0320	Ignition/Distributor Engine Speed Input Circuit	4 ranked fixes
P0321	Ignition/Distributor Engine Speed Input Circuit Range/Performance	4 ranked fixes
P0322	Ignition/Distributor Engine Speed Input Circuit No Signal	4 ranked fixes
P0323	Ignition/Distributor Engine Speed Input Circuit Intermittent	4 ranked fixes
P0335	Crankshaft Position Sensor A Circuit	4 ranked fixes
P0336	Crankshaft Position Sensor A Circuit Range/Performance	4 ranked fixes
P0337	Crankshaft Position Sensor A Circuit Low	4 ranked fixes
P0338	Crankshaft Position Sensor A Circuit High	4 ranked fixes
P0339	Crankshaft Position Sensor A Circuit Intermittent	4 ranked fixes
P0385	Crankshaft Position Sensor B Circuit	4 ranked fixes
P0386	Crankshaft Position Sensor B Circuit Range/Performance	4 ranked fixes
P0387	Crankshaft Position Sensor B Circuit Low	4 ranked fixes
P0388	Crankshaft Position Sensor B Circuit High	4 ranked fixes
P0389	Crankshaft Position Sensor B Circuit Intermittent	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)

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