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Code

P0012

Variable valve timing

Intake camshaft timing over-retarded — Bank 1

The intake cam is retarded beyond the commanded range.

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Most likely causes

Faulty VVT solenoid
Low oil pressure
Wiring fault
Stuck phaser

Symptoms you may notice

Check engine light
Lack of power
Rough idle

Checks to run

Test the VVT solenoid
Check oil pressure
Inspect the cam phaser

Tools you may need

OBD-II scanner Multimeter

Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.

Related codes in Variable valve timing

Intake camshaft timing over-advanced — Bank 1

Crankshaft / camshaft position correlation — Bank 1

Crankshaft / camshaft position correlation — Bank 1 Sensor B

Intake camshaft timing over-advanced — Bank 2

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