Q: Cold weather makes the motor knock

asked by on

My 2008 Toyota Highlander has a problem basically every time it starts up. The vehicle just passed 70,000 miles and there is a kind of knocking noise from the engine when I start it cold. It is more of a rattle than a violent knocking noise and it goes away once the motor is warm. Is this something I should get checked out or is my vehicle just showing its age?

This is a common problem with Hybrid Highlanders. Does the Check Engine Light illuminate when the knocking occurs? If so, Toyota released a technical service bulletin (TSB) related to cold start misfires. The associated TSB (T-SB-0210-11) covers the inspection, diagnosis and repair of the cold start misfire. However, coverage under this TSB is only applicable during the 96 month/100,000 mile hybrid warranty period. Your local Toyota dealer can provide further information. If the unit is not covered under warranty, a local mechanic (like those with YourMechanic) can diagnose the problem with a scan tool.

Was this answer helpful?
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details
  1. Home
  2. Questions
  3. Cold weather makes the motor knock

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Changing the front struts as a complete assembly

When I looked up the parts, the struts should be the same on both sides. When installing the struts, you need to make sure the top mount is in the same position as the removed one before you try and...

Q: Drive belt keeps popping off

The first thing to check is whether all of the pulleys are in the same plane. Imagine a flat surface applied up against the pulley edges. Do all pulleys touch the flat surface? If a pulley, for instance, on the...

Q: Will I Void My Warranty if I Change My Car's Exhaust System?

As a general rule of vehicle warranty, you cannot modify your vehicle's exhaust system if it involves any smog-related component, such as catalytic converters, while your vehicle is still under an emissions warranty. Emissions warranties are valid for a longer...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...