P0315 on 2001-2006 Chevrolet Silverado 2500HD — Crankshaft Position System Variation Not Learned
1 vehicles · 1 makes · $150-$500 repair
How to diagnose and fix P0315: most-reported vehicles
Ranked by owner reports. Each card gives the symptoms, how to confirm the cause, the fix, parts and sources for that vehicle.
Chevrolet Silverado 2500HD · 2001–2006
The 8.1L Vortec 496 big-block, offered in the 2500HD alongside the Duramax, has a well-known crankshaft position sensor weakness concentrated on the earliest build years. The sensor sends erratic or dropped signals to the PCM, which throws ignition timing off and produces rough idle, hesitation, stalling - often when hot - and eventually a crank-no-start that clears after the engine cools. GM revised the sensor design during the run, so late trucks are far less affected. This is an 8.1L gas issue and has nothing to do with the Duramax diesel sold in the same body.
Common Symptoms
- Engine stalls while driving
- Hard start or no-start when hot
- Rough idle
- Hesitation and loss of power
- Check engine light
- Tachometer drops out momentarily
How to Fix
No recall. Confirm with a scan tool that a crankshaft position correlation or circuit code is stored and that RPM signal drops out during the stall - a fuel pump failing hot presents nearly identically. The repair is replacement of the crankshaft position sensor with the updated AC Delco design, followed by the crankshaft position variation relearn procedure, which the PCM requires or the truck may run poorly or set the code again. Inspect the sensor connector and harness for heat damage while it is accessible.
Sources for this issue (3)
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P0315 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does P0315 mean?
P0315 stands for "Crankshaft Position System Variation Not Learned." The crankshaft position variation (relearn) procedure has not been completed, so the ECM/PCM lacks the reference data it needs to accurately run the misfire monitor. Each crankshaft reluctor wheel has small tooth-spacing variations; the controller must 'learn' these to tell a real misfire from normal mechanical variation. Commonly appears after an ECM replacement/reflash or crankshaft sensor/engine work.
What are the most common causes of P0315?
The most common causes of P0315 are: Crankshaft variation relearn not performed after ECM/PCM replacement or reflash, Crankshaft position sensor replaced without relearn, Damaged crankshaft reluctor/tone ring, Faulty crankshaft position sensor, Low battery voltage interrupting the relearn. The specific cause varies by vehicle.
How much does it cost to fix P0315?
Repair costs for P0315 range from $150 to $500, depending on the vehicle and root cause.
Which vehicles are affected by P0315?
Au7o has documented P0315 across 1 vehicle models from 1 manufacturers: Chevrolet.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.