What Does P1336 Mean?
P1336 indicates an intermittent interruption of the crankshaft speed fluctuation sensor signal. Unlike a complete signal loss, this code means the sensor signal is dropping out briefly and returning, often due to a loose connection, marginal sensor, or minor reluctor ring damage. The ECU uses this signal for misfire detection and knock control calculations.
Safety Warning
Intermittent CKP signal loss can cause momentary engine hesitation or stalling at unpredictable times, creating a hazard in traffic. Repair promptly.
Common Causes
30%
Loose or corroded CKP sensor connector causing intermittent contact
25%
Crankshaft position sensor failing under heat or vibration
20%
Chafed or broken wire strand in the CKP sensor harness
15%
Minor reluctor ring damage or debris on the tone wheel
10%
Excessive crankshaft end play causing variable air gap
Diagnostic Steps
1
Review freeze frame data to identify the engine conditions (RPM, temperature, load) when the intermittent signal loss occurred.
2
Perform a thorough visual inspection of the CKP sensor connector. Disconnect, clean the terminals, and check for spread or damaged pins.
3
Wiggle test the CKP sensor wiring harness while monitoring the sensor signal with a scan tool or oscilloscope. Flex the harness at multiple points near the connector, routing clips, and engine mount contact areas.
4
Measure the CKP sensor air gap and verify it is within specification. An out-of-spec gap can cause signal dropouts at certain RPM ranges.
5
If the sensor passes all checks, inspect the crankshaft reluctor ring for contamination (metal shavings, oil buildup) or minor physical damage.
Estimated Repair Cost
$80 - $350
Parts + labor, varies by vehicle and location
P1336 indicates an intermittent interruption of the crankshaft speed fluctuation sensor signal. Unlike a complete signal loss, this code means the sensor signal is dropping out briefly and returning, often due to a loose connection, marginal sensor, or minor reluctor ring damage. The ECU uses this s...
The most common cause of P1336 (Crankshaft Speed Fluctuation Sensor Intermittant Interruption) is: Loose or corroded CKP sensor connector causing intermittent contact
Typical repair costs for P1336 range from $80 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Intermittent CKP signal loss can cause momentary engine hesitation or stalling at unpredictable times, creating a hazard in traffic. Repair promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1336 to identify the root cause.
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Quick Info
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Powertrain
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Engine Position Sensing
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