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?

A: This is a common problem with Hybrid Highla...

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・Save up to 30%

Get a quote

What others are asking

Q: Car shakes at 40-6- mph and brakes squeak

Many different things can cause a vibration at speeds. The most common causes of this would be warped brake rotors, a damaged suspension component, or tire that is damaged or out of balance. It is possible for this fault to...

Q: Hard to put the car into 1st and 2nd,a tiny bit hard in 3rd, rest are fine.

The transmission internal gears have these special rings that synchronizes the gears using a special blocking ring that work together to help the gears line up and make them go together without grinding. If these special rings are worn out,...

Q: Warranty information from Your Mechanic

Question sent to CS about extended warranty honored.

Related articles

How to Renew Your Car Registration in Oklahoma(DELETED)
Having your car registered with the Oklahoma Tax Commission is an important part of driving legally in this state. You will need to do this within 30 days of moving to Oklahoma...
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 P0052 code means This code is seen when the Engine Control Module (ECM) tries to control 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...