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

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

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: differential noise

The most common noise that matches that description would be a worn wheel bearing. Your car is front wheel drive. The differential is built into the transmission at the front. Wheel bearing noise can resonate through metal parts to disguise...

Q: Car wont start 1991 Ford

Hi there - regarding the whining noise - your alternator may have bearings that are failing. It may still charge properly (for a while), but will fail at some point. Check your power steering fluid level as well - low...

Q: My car idles rough and surges i

In your case, the most likely cause is that your EGR valve is partly stuck open or your engine has a vacuum leak. Either of these things will cause the engine to run rough at idle but runs okay above...

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...
How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
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...