P0335 on Chevrolet: How to Diagnose & Fix
Crankshaft Position Sensor A Circuit Malfunction
2 Chevrolet models · 2 documented issues · $80-$500 repair
P0335 on Chevrolet by model: symptoms, diagnosis and fix
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)
The crankshaft position sensor fails due to heat exposure, causing intermittent stalling and no-start conditions. The sensor is located behind the harmonic balancer and is exposed to engine heat and oil contamination. Failure is often intermittent, making diagnosis difficult until complete failure occurs.
Common Symptoms
- Intermittent stalling
- No-start condition
- Engine dies and restarts after cooling
- Check engine light with crank sensor code
How to Fix
Replace the crankshaft position sensor. The harmonic balancer must be removed for access. Inspect the balancer for rubber separation while it is removed. Use a quality OEM-equivalent sensor. Apply anti-seize to the sensor bolt threads. Clear any stored DTCs after installation.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Engine Crankshaft Position SensorCross-ref235-1021
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
P0335 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 P0335 mean on a Chevrolet?
P0335 stands for "Crankshaft Position Sensor A Circuit Malfunction." This code means the engine computer has lost or detected a faulty signal from the crankshaft position sensor (sensor A), which tells the computer exactly how fast and in what position the crankshaft is rotating. That signal is essential for timing the spark and fuel injection, so a problem here can cause hard starting, stalling, or a no-start condition. The computer sets this code when the crank sensor signal is missing, erratic, or out of its expected pattern. Causes range from a failed sensor or damaged wiring to a problem with the reluctor (tone) ring the sensor reads. On Chevrolet it is documented across 2 models: Silverado 2500HD, Lumina.
What are the most common causes of P0335?
The most common causes of P0335 are: Failed crankshaft position sensor, Damaged, corroded, or loose sensor wiring/connector, Metal debris or oil contamination on the sensor tip, Damaged or misaligned reluctor (tone) ring, Excessive air gap between sensor and tone ring, Wiring shorted or open in the sensor circuit, Faulty PCM/ECM (rare). The specific cause varies by vehicle.
How much does it cost to fix P0335 on a Chevrolet?
Published repair estimates on Chevrolet range from $80 to $500 depending on the model and root cause. If an issue mentions a recall or campaign, check your VIN with the manufacturer or NHTSA and confirm eligibility and coverage with a dealer.
Looking for P0335 on a different make?
View P0335 across all makes →Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.