Skip the auto shop - Our mechanics make house calls

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?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
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

Q: Temperature gadget goes up while in traffic

This can be caused by a number of things such as low coolant levels, a faulty thermostat, or a failing coolant fan switch. As you may know the coolant fan switch helps to maintain the proper coolant temperature by turning...

Q: Car lost power and stalled

Hello there. It's kind of odd that your 2011 Mazda2 is exhibiting this issue with so few miles on it. However, many different faults can cause the vehicle to stall. The most common would be the fuel pump, fuel filter,...

Q: Maintenence warranty

As you know, with any car the life expectancy of it depends largely on the maintenance schedule the owner has maintained, the driving conditions it is subjected to, the driving habits of the owner and many other factors. As with...

Related articles

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...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...