Faulty camshaft position timing solenoid (oil control valve) with an open or shorted internal coil; Damaged or corroded wiring harness or connector at the solenoid; Open or shorted circuit between the solenoid and the powertrain control module; Contaminated engine oil or sludge blocking the solenoid's oil passages, causing mechanical binding; Failed powertrain control module driver for the solenoid circuit (uncommon)

DTC codes / Mazda codes / P1382

P1382 · MazdaCamshaft Position Timing Solenoid 1 Circuit

Q: What does code P1382 mean?

Camshaft Position Timing Solenoid 1 Circuit. P1382 on Mazda vehicles indicates that the powertrain control module has detected an electrical fault in the circuit for the camshaft position timing solenoid, which is the oil control valve that adjusts camshaft phasing. The computer monitors the solenoid's electrical current and flags this code when the measured current falls outside the expected range for the commanded duty cycle, pointing to an open, short, or excessive resistance in the solenoid circuit.

P1382 on Mazda vehicles indicates that the powertrain control module has detected an electrical fault in the circuit for the camshaft position timing solenoid, which is the oil control valve that adjusts camshaft phasing. The computer monitors the solenoid's electrical current and flags this code when the measured current falls outside the expected range for the commanded duty cycle, pointing to an open, short, or excessive resistance in the solenoid circuit.

SystemPowertrain

Code typeMazda specific

SeverityMedium

Fix difficultyIntermediate

AreaIgnition system and misfire

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
Rough idle or unstable engine speed, especially when cold
Reduced engine power or sluggish acceleration due to incorrect camshaft timing
Poor fuel economy or increased emissions
In rare cases, a no-start condition if the camshaft is stuck in an unfavorable position

Common causes, most likely first

Faulty camshaft position timing solenoid (oil control valve) with an open or shorted internal coil
Damaged or corroded wiring harness or connector at the solenoid
Open or shorted circuit between the solenoid and the powertrain control module
Contaminated engine oil or sludge blocking the solenoid's oil passages, causing mechanical binding
Failed powertrain control module driver for the solenoid circuit (uncommon)

How to diagnose and fix it

Connect a scan tool and verify P1382 is the only related code; check for other camshaft or crankshaft codes that could indicate a different root cause.
Inspect the solenoid connector and wiring for corrosion, chafing, or loose pins, and repair as needed.
Measure the resistance of the camshaft position timing solenoid with a multimeter and compare to the manufacturer's specification; replace if out of range.
Check for battery voltage at the solenoid connector with the key on and engine off, and verify the ground side of the circuit; repair open or shorted wires.
Remove the solenoid and inspect for sludge or debris; clean the oil passages and replace the solenoid if mechanical binding is evident.
Clear the code and perform a road test to confirm the repair; if the code returns, perform a bidirectional test of the solenoid with a scan tool to verify PCM control.
If all electrical and mechanical checks pass, suspect a faulty PCM and perform pinpoint diagnostics before replacement.

Oil quality and hidden circuit faults

A dirty or sludged engine oil system is a leading cause of this code on Mazdas, as the solenoid's fine oil passages clog and cause the valve to stick, which the PCM interprets as an electrical fault.
The code can be set by a momentary glitch in the wiring, such as a rubbed-through insulation that only shorts when the engine moves under load, so a wiggle test of the harness while monitoring solenoid current is essential.
Many technicians replace the solenoid without checking the oil control valve filter screen, which can be clogged and cause the new solenoid to fail in the same way.
P1382 does not always mean the solenoid is defective; a weak battery or poor ground can cause the PCM to misread the solenoid current and set a false code.
On some Mazda engines, the camshaft timing solenoid shares a power circuit with other solenoids, so a blown fuse or relay can set P1382 along with other codes.

Can I keep driving with P1382?

You can usually continue driving with P1382, but avoid heavy acceleration and prolonged idling because incorrect camshaft timing can cause poor performance and increased emissions. If the engine runs roughly or stalls, have the vehicle inspected promptly to prevent damage to the catalytic converter.

Tools that help

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Guidance is general and written for Mazda vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.