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2010 Toyota Camry VSC and Check Engine Lights On: P0607, P0012, C1201, C1231 Diagnosis and Fixes

Model: 2010 Toyota Camry Fault Code: C1201 Posted: 2019-09-13 13:42

The VSC and check engine lights are currently on, but the vehicle is running smoothly. Diagnostic trouble codes retrieved include P0607, P0012, C1201, and C1231. P0012 indicates a potential issue with the variable valve timing (VVT) system, possibly due to: - Incorrect camshaft timing - Wiring faults in the intake timing control valve solenoid circuit - Continuous oil flow to VCT piston chamber - A failed or stuck-open timing valve control solenoid P0607 relates to a fault in the engine control module (ECM) communication, while C1201 and C1231 are related to sensor or actuator signal integrity. Recommended steps: 1. Verify battery voltage, ground connections, and engine oil condition — poor oil can affect VVT operation. 2. Confirm whether the VVT solenoid has been replaced (note: 2010 Toyota Camry 2.4L engines have one primary VVT solenoid; some sources may incorrectly reference a second). 3. Inspect the oil filter for blockages in the oil flow path to the VVT system — this is critical as restricted flow can cause P0012 and related codes. 4. Test circuit integrity using a digital multimeter (DVOM) to verify signal from PCM to VVT solenoid. 5. Perform a functional test by applying 12V directly to the VVT solenoid while idling — if engine stumbles or stalls, it indicates the actuator is working properly. 6. If codes persist after these checks, consider replacing the camshaft position sensor (though this typically generates distinct error codes). Note: The oil filter location for the 2.5L engine may not be widely documented; refer to head assembly diagrams or consult OEM wiring schematics from BBBind.com or Toyota parts databases.

Related fault codes
C1201C1231P0012P0607
Comments (10)
Anonymous 2019-09-13 14:04

Begin with P0012 and confirm that the battery, ground connections, and engine oil are in good condition. A P0012 code may stem from one of these causes: incorrect camshaft timing, wiring faults in the VVT solenoid circuit, continuous oil flow to the VCT chamber, or a failed control solenoid. For more details, see official documentation on p0012.

Anonymous 2019-09-29 10:29

I replaced both variable valve timing (VVT) solenoids and have been advised that it may take several driving cycles for the codes to clear. I’ll monitor the situation over time.

Anonymous 2019-09-29 11:23

Allow the vehicle to complete multiple drive cycles. To accelerate clearing, use a code reader to erase the stored codes or disconnect the battery for 15 minutes. Report back if the codes clear or return after this process.

Anonymous 2019-10-04 08:13

The VSC and check engine lights remain on even after consistent driving. I’ve been told that P0012 might also relate to the camshaft position sensor — should I consider replacing that component next?

Anonymous 2019-10-04 11:42

Just to confirm: does the 2010 Toyota Camry 2.4L engine have two VVT solenoids? If so, which one was replaced and where is it located?

Anonymous 2019-10-04 13:03

Based on official parts diagrams (e.g., https://parts.toyota.com/a/Toyota_2010_...-1104.html), the 2.4L engine has only one primary VVT solenoid. I attempted to embed the image directly but was unable to do so.

Anonymous 2019-10-04 15:35

Another key point: inspect the oil filter for blockages in the flow path to the VVT system. While the exact location may vary, it’s typically found on the engine head assembly — consult a parts layout diagram. Before replacing the camshaft position sensor (which usually shows its own error codes), verify circuit integrity between the PCM and VVT solenoid using a DVOM. A quick test: disconnect the VVT intake solenoid and apply 12V at idle. If the engine stumbles or stalls, it confirms the actuator is functional.

Anonymous 2019-10-04 20:24

Thanks for the detailed guidance — I’ll implement these steps step by step.

Anonymous 2019-10-08 10:09

I located the second VVT solenoid (though it appears to be a common misidentification). Both have been replaced. Still working on identifying the oil filter location specific to the 2.5L engine — I found many videos for the 2.4L model, but not the 2.5L variant.

Anonymous 2019-10-08 11:18

I have a 2.4L engine, so my filter location is limited in relevance. A practical test: disconnect the VVT intake solenoid connector and apply 12V directly to it while idling. If the engine stumbles or stops, this confirms that oil pressure through the solenoid was sufficient — indicating the filter may not be blocked.