Keep ignition timing and fuel delivery precisely synchronized with the Standard Ignition Engine Crankshaft Position Sensor PC503. It drops in as a direct-fit replacement for the 2004-2006 Cadillac SRX, 2005-2006 Cadillac STS, and 2004-2006 Cadillac XLR.
This sensor reads the position and rotational speed of the crankshaft and reports that signal to the engine control module, which uses it to time spark and fuel injection. When the original sensor's signal drifts or drops out, the engine can lose that reference and run poorly.
- Core function: monitors crankshaft position and rotational speed and sends a reference signal to the engine control module for ignition and fuel-injection timing.
- Direct-fit design: made to replace the original crankshaft position sensor on the listed applications.
- Signs it may need replacing: hard starting, intermittent stalling, engine misfires, a no-start condition, or an illuminated check engine light — if a failed crankshaft position sensor is the cause. Diagnose the root cause before replacing.
Interchange: Manufacturer part number PC503.
Frequently Asked Questions
What does the PC503 crankshaft position sensor do?
It monitors the crankshaft's position and rotational speed and sends that signal to the engine control module, which uses it to time ignition spark and fuel injection.
Which vehicles does the PC503 fit?
It's a direct-fit replacement for the 2004-2006 Cadillac SRX, 2005-2006 Cadillac STS, and 2004-2006 Cadillac XLR. Check the Buyer's Guide tab to confirm your vehicle.
What are signs a crankshaft position sensor may be failing?
Common signs include hard starting, intermittent stalling, engine misfires, a no-start condition, or a check engine light. Diagnose the cause before replacing, as other components can produce these symptoms.
Is this the same as a camshaft position sensor?
No. The crankshaft position sensor tracks the crankshaft, while the camshaft position sensor tracks the camshaft. They are separate components with different jobs.
What is the manufacturer part number?
This is Standard Ignition part number PC503.
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