What Does P1366 Mean?
The engine control module has detected an intermittent signal from the Top Dead Center (TDC) sensor for cylinder bank 2. This sensor helps the ECM determine precise piston position for fuel injection and ignition timing.
Common Causes
35%
Faulty TDC/CKP sensor with internal intermittent failure
30%
Damaged or corroded wiring harness and connectors to TDC sensor
20%
Loose or damaged reluctor ring on crankshaft
15%
ECM internal circuit fault
Diagnostic Steps
1
Step 1: Inspect TDC sensor wiring and connector for damage, corrosion, or looseness
2
Step 2: Monitor TDC sensor signal with oscilloscope during engine operation to identify intermittent dropout
3
Step 3: Check air gap between TDC sensor and reluctor ring (typically 0.5-1.5mm)
4
Step 4: Test sensor resistance and compare to manufacturer specifications
5
Step 5: Inspect reluctor ring for damage, missing teeth, or debris buildup
Estimated Repair Cost
$150 - $450
Parts + labor, varies by vehicle and location
The engine control module has detected an intermittent signal from the Top Dead Center (TDC) sensor for cylinder bank 2. This sensor helps the ECM determine precise piston position for fuel injection and ignition timing.
The most common cause of P1366 (Intermittent Interruption In TDC 2 Sensor Circuit) is: Faulty TDC/CKP sensor with internal intermittent failure
Typical repair costs for P1366 range from $150 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause intermittent stalling, rough running, or no-start conditions. Vehicle may be unreliable but typically safe to drive short distances to repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1366 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System / Engine Timing
Difficulty
Type
Manufacturer
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