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DTC codes / Toyota codes / P1663

P1663 · ToyotaOCV Circuit Malfunction Bank 2

P1663 on Toyota vehicles indicates that the engine control module has detected an electrical malfunction in the oil control valve circuit for bank 2, which is the valve that manages oil pressure to the variable valve timing system on that cylinder bank. The computer monitors the circuit for open, short, or out-of-range conditions and sets this code when the expected current or voltage is not present.

SystemPowertrain
Code typeToyota specific
SeverityMedium
Fix difficultyIntermediate
AreaComputer and output circuits

Symptoms you may notice

  • Illumination of the check engine light, often with no other noticeable symptoms
  • Rough idle or engine misfire, particularly when the engine is cold
  • Reduced engine power or poor acceleration due to disabled variable valve timing
  • Decreased fuel economy from the engine running in a default timing mode
  • In some cases, a rattling noise from the timing chain area if oil pressure to the phaser is affected

Common causes, most likely first

  1. Faulty oil control valve (OCV) solenoid on bank 2, such as a burned-out coil or stuck plunger
  2. Damaged or disconnected electrical connector at the bank 2 OCV
  3. Corroded, broken, or shorted wires in the OCV circuit between the ECM and the valve
  4. Sludge or debris clogging the OCV screen or oil passages, restricting oil flow
  5. Engine oil level too low or oil pressure insufficient to operate the VVT system
  6. Failed engine control module (ECM) driver for the OCV circuit, though this is rare

How to diagnose and fix it

  1. Check engine oil level and condition; top up or change oil if contaminated or low
  2. Inspect the bank 2 OCV electrical connector for corrosion, tightness, and damaged pins
  3. Measure the resistance of the bank 2 OCV solenoid with a multimeter and compare to specification
  4. Perform a voltage drop test on the OCV circuit while commanding the valve on with a scan tool
  5. Remove and inspect the OCV for sludge or debris; clean or replace as necessary
  6. Verify oil pressure to the VVT system with a mechanical gauge if the valve and circuit test good
  7. If all else checks out, diagnose the ECM driver circuit or replace the ECM as a last resort

What Toyota techs check before replacing the OCV

  • A clogged OCV screen from neglected oil changes is a frequent culprit that mimics a failed solenoid, so always inspect the valve for sludge before condemning it.
  • The bank 2 OCV is often located on the rear cylinder head of transverse V6 engines, making access difficult and increasing the chance of a misdiagnosis due to a pinched wire during previous repairs.
  • This code can be set by a momentary electrical glitch, so always check for stored freeze-frame data and perform a wiggle test on the harness before replacing parts.
  • Low oil pressure from a worn oil pump or a restricted oil filter can trigger P1663 even when the OCV itself is functioning correctly, so verify oil pressure if the valve tests good.
  • On some Toyota models, the same OCV circuit is shared with other VVT-related codes, so a single faulty valve can set multiple codes and lead to unnecessary replacement of other components.

Can I keep driving with P1663?

You can usually drive the vehicle short distances to a repair shop, but avoid aggressive acceleration and heavy loads because the engine may enter a limp mode and variable valve timing will be disabled. Prolonged driving with this code can lead to poor fuel economy and potential catalytic converter damage from rich running.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

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

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