Q: Cold weather makes the motor knock

asked by on November 07, 2015

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

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

Do I need to replace the alternator?

You will need to have the alternator replaced. Older versions of alternators were serviceable at one point, and some still are. Todays parts are starting to be designed to be non-serviceable. You may find a mechanic that can service your...

Car stalling at first start, black smoke from exhaust

Hello. There are a few possibilities for why your car is stalling when you first start it. Your car’s coolant temperature sensor could be sending the wrong information to the PCM, which will cause the PCM to send the wrong...

How do you start the engine?

While starting the engine in your car is as simple as turning the key, there are a few steps that must be followed to make sure that it will actually crank. Here’s what you should do: Make sure the...

Related articles

P0018 OBD-II Trouble Code: Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A)
P0018 code definition Crankshaft Position - Camshaft Position Correlation (Bank 2 Sensor A) What the P0018 code means P0018 is the OBD-II...
P0089 OBD-II Trouble Code: Fuel Pressure Regulator 1 Performance
P0089 trouble code definition P0089 is Fuel Pressure Regulator 1 Performance, indicating a problem in the fuel pressure regulator system. This code...
P0097 OBD-II Trouble Code: Intake Air Temperature Sensor 2 Circuit Low Input
P0097 P0097 code definition Intake Air Temperature Sensor 2 Circuit Low Input What the P0097 code means P0097 is the OBD-II generic code indicating the engine control module (ECM) has determined that the intake air temperature sensor 2 (IAT2) input...