Skip the auto shop - Our mechanics make house calls

Q: Engine noise when cranking. P0011 and P0021 codes

asked by on

I have a 2004 Nissan Altima 3.5. I had an obd code p0011 & p0021 I believe. I did some online research and changed my oil and reset the check engine light. Now on a cold crank my engine rattles (or knocks) for like 3 seconds then stops. I never hear it again until the next morning when i get ready to go to work. Can you tell me the problem and what course I need to take to repair it

My car has 104000 miles.
My car has an automatic transmission.

A: Hi there. The P0011 OBD-II error code indic...

Hi there. The P0011 OBD-II error code indicates that you have an over advanced timing issue, which might be the reason why your engine stumbles for a brief moment when it's cold and first starts. Ignition timing is typically monitored by the crankshaft position sensor, which may be the source of this error code and the cold starting issues. However, it could be multiple electrical or even fuel-related issues that are causing the rough starting problem. To know for certain, it's a good idea to contact a professional mechanic to complete an engine is hard to start inspection so that this can be properly addressed.

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: loud hum coming from the front tires when driving on highway

Hello. The brake caliper hanging up can cause the noise you are hearing. If the caliper is causing the brake pads to drag, this will occur. It can also be caused by a bearing failing, which will cause the noise...

Q: When I fuel up, my car will not start, it takes about 3 tries and I have to pump the gas

Can you hear the fuel pump prime when you turn the key to "On" before cranking it over? Before starting, turn the key to "On" for a few seconds. Listen carefully for a faint "whirling" sound. Have you had the...

Q: Transmission is hard to change over after overheating due to a ruptured radiator hose.

There are 2 unrelated issues going on here. The poor idling may well reflect a blown headgasket from the overheating event you mention. This would show up as rough idling and spark plug firing issues/codes. The harsh shifting can be...

Related articles

How Do Power Car Windows Increase Passenger Safety?
Power windows are responsible for approximately 2,000 emergency room visits every year. When a power window closes, it exerts enough force to bruise or break bones, crush fingers, or restrict an airway. Though...
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...