What causes P0012 on a Toyota Tacoma?

Common causes of P0012 on Toyota Tacoma: VVT-i system over-retarded due to worn OCV solenoid or clogged oil passages; Low engine oil level or degraded oil unable to actuate VVT-i cam phaser; Timing chain stretch on high-mileage 2AZ-FE or 1GR-FE engines; Failed camshaft position actuator allowing excessive play.

P0012

P0012 Toyota Tacoma

Q: How much does it cost to fix P0012 on a Toyota Tacoma?

Fixes for P0012 on Toyota Tacoma include: Replace Denso OCV (intake camshaft timing control solenoid), Change engine oil and filter with Toyota 0W-20 — verify oil level is correct, Inspect timing chain for stretch using a timing chain gauge — replace if beyond spec, Clean oil passages to VVT-i actuator.

Intake Camshaft Position Timing Over-Retarded (Bank 1) · Powertrain Code · High · Repair: Moderate

What is P0012?

The intake camshaft timing on bank 1 is more retarded than the ECM commanded.

When the Toyota Tacoma triggers code P0012 (intake camshaft position timing over-retarded (bank 1)), it typically points to an issue in the powertrain system. This is a high severity code, so address it promptly to avoid further damage or safety concerns. Below you'll find the most common causes, symptoms, and repair options specific to the Toyota Tacoma.

This repair is rated moderate, meaning some experience and specialty tools required.

Diagnostic data on this page is compiled from publicly available repair resources and technical service bulletins. Always have a qualified mechanic confirm the diagnosis before authorizing repairs on your Toyota Tacoma.

Common Causes on Toyota Tacoma

VVT-i system over-retarded due to worn OCV solenoid or clogged oil passages
Low engine oil level or degraded oil unable to actuate VVT-i cam phaser
Timing chain stretch on high-mileage 2AZ-FE or 1GR-FE engines
Failed camshaft position actuator allowing excessive play

Symptoms

Check Engine Light, especially after cold starts
Poor idle quality and occasional stalling
Reduced power at low RPM
Increased fuel consumption

Recommended Fixes

Replace Denso OCV (intake camshaft timing control solenoid)

Change engine oil and filter with Toyota 0W-20 — verify oil level is correct

Inspect timing chain for stretch using a timing chain gauge — replace if beyond spec

Clean oil passages to VVT-i actuator

Notes for Toyota Tacoma

Toyota recommends 0W-20 synthetic oil for optimal VVT-i operation — thicker oils can cause sluggish cam phasing, especially in cold weather.

P0012 Toyota Tacoma

What is P0012?

Common Causes on Toyota Tacoma

Symptoms

Notes for Toyota Tacoma

Check Toyota Tacoma Specs