P1381 on Acura: How to Diagnose & Fix
P1381 — Acura-specific definition
1 Acura model · 1 documented issue · 1 critical · $250-$600 repair
P1381 on Acura by model: symptoms, diagnosis and fix
The TEC/Hitachi internal-coil distributor on third-generation Integras is a chronic failure point. Heat from the internal ignition coil degrades the coil, igniter (ICM), and bearings, causing intermittent stalling at operating temperature, hot-restart problems, and dead no-starts. Owners also report misfires, and some describe the engine shutting off while driving with no warning light, traced to the distributor.
Common Symptoms
- engine stalls while driving
- hot no-start
- intermittent misfire
- check engine light
- rough idle when warm
- engine cuts out and restarts
How to Fix
Pull DTCs first — codes P1381 (cylinder position sensor) and OBD1 Codes 4, 8 and 9 (crank, TDC and cylinder position sensors) commonly originate inside the distributor. Replace the complete OEM distributor assembly (avoid cheap aftermarket — many fail within months). OBD1 (94-95) and OBD2 (96-99) distributors are not interchangeable; the two generations also use different harness plugs. Budget $250-550 for a quality unit installed.
What you need to fix it
Only diagnosis- and fitment-reviewed repair parts are linked here.
- Non-VTEC 1994–1999
Approved replacement: Non-VTEC 1994–1999 (verify TD-85U/connector).
- GS-R 1994–1995Fits 1994-1995
Verified repair component. Approved replacement: GS-R 1994–1995.
- GS-R 1996–1999 / Type R 1998–1999, 9-pinFits 1996-1999
Verified repair component. Approved replacement: GS-R 1996–1999 / Type R 1998–1999, 9-pin.
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Owner tips & cautions
- TipMark the distributor housing position before removal so you can return to base timing without a timing light.
Sources for this issue (2)
P1381 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 P1381 mean on a Acura?
On Acura, P1381: Honda/Acura define P1381 as "Cylinder Position (CYP) Sensor Intermittent Interruption" (not a variable cam timing fault) - https://ericthecarguy.com/hondaacura-p1200-to-p1586-obd-ii On Acura it is documented across 1 model: Integra.
How much does it cost to fix P1381 on a Acura?
Published repair estimates on Acura range from $250 to $600 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.
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Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.