Crankshaft Position - Camshaft Position Correlation
What it means
This is a Chevrolet (GM) manufacturer-specific code, and the same number can mean something different on other makes. On Vortec engines with a distributor, the camshaft position sensor sits inside the distributor, so if the distributor is not indexed correctly or has moved, its signal no longer lines up with the crankshaft signal and the computer sets this code. The most common cause is a distributor installed or disturbed without being aligned with a scan tool.
Models covered: Chevrolet (GM) models with Vortec V6/V8 engines and a distributor, mainly around 1996–2004 (e.g. Silverado, Tahoe, Express).
Symptoms4
- Check engine light on, often right after the distributor was removed or replaced.
- Shaking or misfire under acceleration when alignment is far off.
- Hard starting or occasional stumbling in some cases.
- Loss of power, sometimes with misfire codes.
Possible causes6
- Distributor installed out of alignment after a repair or replacement.
- A loose distributor hold-down bolt that lets the distributor rotate.
- A worn distributor gear or bushing that makes the signal unstable.
- A faulty camshaft position sensor inside the distributor or its wiring.
- A stretched or jumped timing chain (less common, more expensive).
- A faulty crankshaft position sensor or connector.
How to diagnose5
- Ask whether the distributor was recently removed or replaced, which points to alignment.
- Read the cam retard (offset) value on a GM-capable scan tool at a steady rpm and compare it with the manufacturer specification.
- Confirm the hold-down bolt is tight and the distributor cannot be turned by hand.
- Inspect the distributor cap and rotor for signs of crossfire between terminals.
- If the value cannot be adjusted by turning the distributor or keeps drifting, check the distributor gear and timing chain.
How to fix5
- Tighten the distributor hold-down bolt if it is loose.
- Align the distributor by rotating it slightly while watching the cam retard value until it is within specification, then tighten it.
- Replace the cap and rotor if they show crossfire marks.
- Replace the distributor or camshaft sensor if the gear is worn or the signal drops out.
- Repair the timing chain if it is stretched, then clear the codes and confirm they do not return.
Repair cost
In Saudi riyals; the highlighted part is the expected range for this fault.
The cost is low when the fix is alignment or tightening the bolt, higher when the distributor is replaced, and at the top of the range if the engine needs a timing chain job.
Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026
Frequently asked questions
The code appeared right after a distributor change. Why?
On these engines the distributor carries the cam sensor, so its rotational position sets how the cam signal lines up with the crank. Installing it by eye without a scan tool often causes this code.
Does turning the distributor change ignition timing like on older engines?
No. The computer controls ignition timing here. Turning the distributor changes rotor alignment and the cam signal, and poor alignment can cause crossfire inside the cap and misfires.
What code do newer engines use?
Newer engines without a distributor usually set the generic code P0016 for crank and cam correlation.
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What was wrong? (optional)
This guide is for information only and does not replace an inspection by a qualified technician. If the fault involves brakes, steering, engine temperature, electrics or refrigerant, do not attempt the repair yourself.
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