P0336 on GMC: How to Diagnose & Fix
Crankshaft Position Sensor 'A' Circuit Range/Performance
1 GMC model · 1 documented issue · 1 critical · $80-$300 repair
P0336 on GMC by model: symptoms, diagnosis and fix
The 4.2L LL8 inline-6 engine in the 2002-2009 GMC Envoy is notorious for crankshaft position sensor failures that cause intermittent stalling and no-start conditions. The sensor is located on the side of the engine block and is exposed to heat soak from the exhaust manifold, accelerating its failure. A failing sensor causes the PCM to lose track of crank position, resulting in the engine cutting out without warning — often at highway speed. The issue tends to be intermittent at first, making diagnosis challenging. Replacement is straightforward and the part is inexpensive.
Common Symptoms
- Engine stalls without warning at any speed
- Hard start or no-start after hot soak
- Check engine light with code P0335 or P0336
- Engine cranks but won't fire when hot
- Intermittent stall that restarts after cooling down
- Rough idle followed by stall
How to Fix
Replace crankshaft position sensor (ACDelco 213-3521 or Delphi SS11378). Clear codes and test. If stalling continues, inspect camshaft position sensor (ACDelco 213-3522) as secondary cause. Verify PCM software is current — older PCM calibrations make the engine overly sensitive to sensor signal dropout.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Engine Crankshaft Position SensorCross-ref235-1078
Fitment confirmed against the ShowMeTheParts catalog for this vehicle's year and engine.
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Sources for this issue (1)
P0336 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 P0336 mean on a GMC?
P0336 stands for "Crankshaft Position Sensor 'A' Circuit Range/Performance." P0336 means the engine control module detected a crankshaft position sensor signal that is present but outside the expected range or pattern — for example, intermittent dropouts, an erratic waveform, or extra/missing pulses. The crankshaft position sensor tells the computer the exact position and speed of the crankshaft, which is essential for timing fuel injection and ignition. When this signal is unreliable, the engine may stumble, stall, hesitate, or be hard to start. Because it underpins basic engine operation, this code should be addressed promptly. On GMC it is documented across 1 model: Envoy.
What are the most common causes of P0336?
The most common causes of P0336 are: Failing crankshaft position sensor, Damaged or contaminated reluctor/tone ring (debris, missing teeth), Wiring damage, chafing, or corroded connectors, Incorrect air gap or loose sensor mounting, Electrical interference from nearby high-voltage components, Metal shavings on the sensor tip, ECM/PCM fault (less common). The specific cause varies by vehicle.
How much does it cost to fix P0336 on a GMC?
Published repair estimates on GMC range from $80 to $300 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 P0336 on a different make?
View P0336 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.