OBD-II Code
P1366
Severity
Not yet reviewed
Nobody on our side has assessed this code yet, so we are not going to guess at how serious it is.
Can you drive it
We cannot say
Treat it as unknown until a shop reads it with live data. If the check-engine light is FLASHING, stop driving as soon as it is safe to — that means an active misfire, whatever the code.
Indicative cost (USD)
$80–$450
From this code's diagnostic notes. Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
$80 (sensor only DIY) to $450 (sensor + VCG + plenum R&R).
P1366 is Acura's TDC Sensor 2 Intermittent code — the companion to P1361.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then follow the diagnostic notes further down this page, in the order they are written.
They are written in the order a shop works this code, cheapest checks first. Where they name a component, inspect its wiring and connector before replacing it.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Check engine light
Read the full diagnostic procedureP1366 is Acura's TDC Sensor 2 Intermittent code — the companion to P1361.
P1366 is Acura's TDC Sensor 2 Intermittent code — the companion to P1361. The J35 V6 runs two TDC sensors for redundancy and for resolving which stroke each cylinder is on during sequential injection; sensor 2 typically lives a few inches from sensor 1 on the same target wheel housing or on the opposite cam, and the ECM compares the two signals to detect timing errors. P1366 means sensor 2 is dropping signal intermittently.
Shop ladder, cheapest first
- Same as P1361 — inspect the TDC2 connector for oil intrusion from a weeping valve cover gasket, clean with contact cleaner, fix the gasket leak.
- Scan live data and snap-throttle while watching the TDC2 Hall pulse on a scope — should be a clean 0-5V square wave with sharp edges at every cam-target tooth. Dropouts, ragged edges, or missing pulses confirm the sensor or harness.
- Compare TDC1 and TDC2 signals side-by-side on a dual-trace scope — if TDC1 is clean and TDC2 is ragged, the problem is isolated to sensor 2 (most cases); if both are ragged, you're looking at a shared ground or 5V reference fault upstream.
- Replace the TDC2 sensor ($45-85 aftermarket) and the valve cover gasket together if the gasket shows any weeping. The expensive misdiagnosis caveat: don't chase P1366 as a cam-timing problem unless you also see P0341/P0344 or knock/misfire codes — the ECM will throw cam-position codes if the actual mechanical timing has slipped, and a standalone P1366 is almost always a sensor or harness issue, not a timing-belt or chain problem.
Vehicle-specific patterns2005-2014 Acura TL/MDX/RL with the J35 V6 throws P1366 in the same VCG-leak scenarios as P1361, often as a paired code (P1361 + P1366 together = both…
- 2005-2014Acura TL/MDX/RL with the J35 V6 throws P1366 in the same VCG-leak scenarios as P1361, often as a paired code (P1361 + P1366 together = both connectors oil-fouled, which is the smoking gun for a leaking valve cover).
- 2003-2008Acura TL (J32) shows the same architecture.
- 2007-2014Acura RDX with the J35 picks up the same failure mode. Honda Odyssey/Pilot/Accord V6 (J35 sister engine) shares the sensor and the gasket-leak root cause across all VCM and non-VCM trims — a P1366 on a Pilot diagnoses identically to a P1366 on an MDX.
Estimated repair$80 (sensor only DIY) to $450 (sensor + VCG + plenum R&R).
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