P1023 Camshaft Position Signal Output B Circuit

Category: Powertrain - Ignition
Severity: Check Engine Light
Applies to: Camry, Corolla, RAV4 with dual cam sensing

What does P1023 mean on a Toyota?

P1023 — Camshaft Position Signal Output B Circuit. This Toyota-enhanced code applies to Camry, Corolla, RAV4 with dual cam sensing.

Common causes of P1023

Open cam signal B output circuit
Failed cam sensor B
Corroded sensor B connector
Damaged tone wheel
ECM input fault

How to fix P1023

Compare cam A and B signals on a scanner
Test B circuit continuity
Inspect the tone wheel
Check the connector
Replace sensor B after circuit proof