OBD
P2373
Fuel Volume Regulator B Control Circuit High
What it means
P2373 stands for Fuel Volume Regulator B Control Circuit High. P2373 is a P code, so the fault sits in the engine, transmission and emissions systems. For P2373, the second digit places it in ignition and misfire. For P2373, work through the cause list below, cheapest checks first.
What to check first
For P2373, pull the connector and inspect the terminals for spread, corrosion or backed-out pins before testing anything else.
Check these first
- P2373: Failing ignition coil, spark plug, or spark plug wire
- P2373: Faulty crankshaft or camshaft position sensor
- P2373: Wiring or connector damage in the ignition circuit
- P2373: Low compression or engine mechanical wear
- P2373: Incorrect ignition timing or a stretched timing chain
What to do next
P2373 belongs to the ignition and misfire system. These are the general steps for P2373, and the exact cause on your vehicle can differ.
- P2373: Read misfire counts and freeze frame data with an OBD-II scanner
- P2373: Test spark output and inspect spark plugs and coils
- P2373: Check crankshaft and camshaft position sensor signals while cranking
- P2373: Swap suspect ignition parts between cylinders to see if the fault moves
- P2373: Compression test if the issue persists on the same cylinder
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.