OBD Camshaft B Position Signal Output Circuit Low Bank 1
What it means
P23ED stands for Camshaft B Position Signal Output Circuit Low Bank 1. P23ED is a P code, so the fault sits in the engine, transmission and emissions systems. For P23ED, the second digit places it in ignition and misfire. For P23ED, work through the cause list below, cheapest checks first.
What to check first
For P23ED, check the bank 1 reading against the other bank before buying parts, since if only one side is out of range that side is the fault.
Check these first
- P23ED: Failing ignition coil, spark plug, or spark plug wire
- P23ED: Faulty crankshaft or camshaft position sensor
- P23ED: Wiring or connector damage in the ignition circuit
- P23ED: Low compression or engine mechanical wear
- P23ED: Incorrect ignition timing or a stretched timing chain
What to do next
P23ED reports from the ignition and misfire system. These steps cover P23ED in general, and the exact cause on your vehicle can differ from the cause named above.
- P23ED: Read misfire counts and freeze frame data with an OBD-II scanner
- P23ED: Test spark output and inspect spark plugs and coils
- P23ED: Check crankshaft and camshaft position sensor signals while cranking
- P23ED: Swap suspect ignition parts between cylinders to see if the fault moves
- P23ED: Compression test if the issue persists on the same cylinder
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.