P1421 Nissan Code - Cold Start Control
Quick Answer
The P1421 Nissan code refers to an issue with the Cold Start Control system in the vehicle. Common causes include Faulty cold start injector, Malfunctioning coolant temperature sensor, Issues with the air intake system. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1421 Nissan indicates Cold Start Control.
- Common causes
- Common causes include Faulty cold start injector, Malfunctioning coolant temperature sensor, Issues with the air intake system.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
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Code P1421 Nissan Description
The P1421 Nissan code refers to an issue with the Cold Start Control system in the vehicle. This system is responsible for controlling the engine's performance during cold starts, ensuring proper fuel delivery and ignition timing for a smooth start-up. When this code is triggered, it indicates that there is a malfunction or fault within the Cold Start Control system, which can lead to issues with starting the vehicle, rough idling, poor fuel efficiency, and overall decreased engine performance.
Common Causes of P1421 Nissan
- Faulty cold start injector
- Malfunctioning coolant temperature sensor
- Issues with the air intake system
- Faulty engine control module (ECM)
- Wiring or electrical problems within the Cold Start Control system
Symptoms of P1421 Nissan
- Difficulty starting the engine, especially in cold weather
- Rough idling or stalling when the engine is cold
- Decreased fuel efficiency
- Engine misfires
- Illumination of the Check Engine Light on the dashboard
How to Fix P1421 Nissan
- Diagnose the specific cause of the issue by using a diagnostic scanner to retrieve the fault codes and performing a thorough inspection of the Cold Start Control components.
- Replace the faulty cold start injector, coolant temperature sensor, or any other damaged components as needed.
- Check for any loose or damaged wiring in the Cold Start Control system and repair or replace as necessary.
- Clear the fault codes from the ECM and reset the system to ensure the issue has been resolved.
- Test drive the vehicle to confirm that the Cold Start Control system is functioning properly and that the symptoms have been eliminated.
Cost to Fix P1421 Nissan
The cost of repairing a P1421 Nissan code can vary depending on the specific cause of the issue and the labor rates in your area. On average, you can expect to pay anywhere from $150 to $500 for parts and labor. Keep in mind that prices may be higher at dealerships or in metropolitan areas, while independent shops may offer more affordable rates. It's recommended to get quotes from multiple repair shops to find the best price for your situation.
Tech Notes for P1421 Nissan
2007-2009 Nissan Versa
2007-2009 Nissan Versa Factory Service Bulletin OBDII Code P1421
2009-2010 Nissan CUBE
2009-2010 Nissan CUBE Factory Service Bulletin OBDII Code P1421
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Information for Specific Nissan Models
- P1421 2006 Nissan Altima Sedan — Cold Start Control
- P1421 2008 Nissan Altima Sedan — Cold Start Control
- P1421 2009 Nissan Altima Sedan — Cold Start Control
- P1421 2007 Nissan Maxima — Cold Start Control
- P1421 2008 Nissan Maxima — Cold Start Control
- P1421 2008 Nissan Rogue — Cold Start Control
- P1421 2009 Nissan Rogue — Cold Start Control
- P1421 2007 Nissan Sentra — Cold Start Control
- P1421 2008 Nissan Sentra — Cold Start Control
- P1421 2009 Nissan Sentra — Cold Start Control
- P1421 2010 Nissan Sentra — Cold Start Control
- P1421 2011 Nissan Sentra — Cold Start Control
- P1421 2012 Nissan Sentra — Cold Start Control
Frequently Asked Questions about P1421 Nissan Code
1. What is OBDII code P1421 on a Nissan related to?
Code P1421 on a Nissan is known as the Cold Start Control error. It typically indicates a problem with the cold start control system.
2. What are common symptoms of OBDII code P1421 in a Nissan?
Common symptoms of code P1421 in a Nissan may include rough idling at startup, difficulty starting the engine when cold, and decreased fuel efficiency.
3. What are the possible causes of OBDII code P1421 in a Nissan?
The most common causes of code P1421 in a Nissan are a faulty cold start control valve, a malfunctioning cold start injector, or issues with the cold start control circuit.
4. How can I diagnose the issue related to OBDII code P1421 in my Nissan?
To diagnose the problem related to code P1421, you can use an OBDII scanner to retrieve the code and then inspect the cold start control valve, injector, and associated wiring for any visible damage or signs of wear.
5. Can I continue to drive my Nissan with OBDII code P1421 present?
It is not recommended to continue driving your Nissan with code P1421 present, as it can lead to poor engine performance and potential damage over time. It is best to address the issue promptly.
6. Are there any DIY repair tips for fixing OBDII code P1421 in a Nissan?
DIY repair tips for addressing code P1421 in a Nissan include checking for loose or damaged wiring connections, cleaning the cold start control valve, and testing the cold start injector for proper function.
7. How much does it typically cost to repair OBDII code P1421 in a Nissan?
The cost of repairing code P1421 in a Nissan can vary depending on the exact cause of the issue and whether you choose to do the repairs yourself or take your vehicle to a mechanic. Costs can range from a simple fix to a more involved repair.
8. Can a faulty cold start control system cause other issues in a Nissan?
Yes, a faulty cold start control system can lead to other issues in a Nissan, such as poor engine performance, stalling, and increased emissions. It is important to address the problem promptly to prevent further damage.
9. How long does it typically take to repair OBDII code P1421 in a Nissan?
The repair time for code P1421 in a Nissan can vary depending on the complexity of the issue and the repair method chosen. Simple fixes may take a short amount of time, while more involved repairs may require more time.
10. Is it possible to prevent OBDII code P1421 from appearing in my Nissan?
While some causes of code P1421 may be unavoidable, regular maintenance of your Nissan, including checking the cold start control system components, can help prevent this code from appearing.
Discuss the causes and fixes for P1421 Nissan OBDII Code
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i changed the filter and it still stays on, wondering how long it will reset the code automatically, or how to erase the code?
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What model and year is your Nissan? try disconnecting the car battery to clear the code.
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I have a 2009 nissan Versa with a P1421 code were should i start to get rid of code
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See "Tech Notes"
There is a factory service bulletin for the 2009 Nissan Versa, the bulletin recommends reprogramming the Engine Control Module (ECM) to fix the problem.
You should start by having the dealer reprogramming the ECM for you.
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Hello, I just recently got this problem now and can not figure out what is wrong. I have a 2009 Nissan Cube. I have cleared the code once before in 2013 (November), and it has reappeared. Any suggestions on what I should look for or what to do? [Note: I don't think the weather can be a factor, it has got as low as 20 degrees Fahrenheit last month and no Service Engine light has came up.]
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There is factory service bulletin for the 2009-2010 CUBE. The bulletin suggest reprogramming the Engine Control Module (ECM) to resolve the problem. See "Tech Notes" above.
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I have a 2010 cube and this is the second time my 'service engine soon' light came on with this code. The first time I replaced the air filter and it hasnt come on in a year. Its back and I already replaced the air filter so its probably the ECM. when you say theres a 'factory service bulletin' does that mean its a recall of some sort? should I not be charged for this service? (I'm not trying to sound cheap but the nissan dealer nearest to me is super shady. They raked me over the coals for the last part I needed and I was without my cube for 23 days.)
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A service bulletin is just information from the factory to help techs fix the vehicles. If there was a recall for this problem, then the repair could be cover under warranty. You may not need to replace the ECM, just reprogram the ECM with the latest software.
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I have an 09 Nissan versa I just had an electronic start put on and now my check engine light is on. I had it checked and the code comes up as cold start control. Could this have anything to do with the electronic start?
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Did the engine light came ON right after the installation? It shouldn't be related. You should have them check the installation just in case.
There is factory service bulletin for the 2007-2009 Versa. The bulletin suggest reprogramming the Engine Control Module (ECM) to resolve the problem. See "Tech Notes" above. -
Hello I have a 2009 nissian cube and this the second time I have this p1421 code come up. The first time I replaced the cabin air filter and it went off. That was about 4 months ago. Now it's back same code. I have seen the bulitan we are suppose to do. Does that have to be done at dealer ? What are my options ?
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The control unit of your Nissan Cube has to be reprogram, you can have that done at the dealer or any independent repair shop that specialized on Nissan.
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Hello I have a 2009 nissian cube and this the second time I have this p1421 code come up. The first time I replaced the cabin air filter and it went off. That was about 4 months ago. Now it's back same code. I have seen the bulitan we are suppose to. Does the dealer have to do the bulitan ? What are my options ?
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No, you need an special OBDII scanner to perform the reprogram and the new program can only be access by the dealer.
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was just wondering if anyone can help?got a 2010 Nissan versa with 1.8 engine..showing p1421 code..i just changed alternator and next morning code /service engine soon light came on..checked gas cap ,air filter. no driveability issues.. disconnected battery for about 15 min,but code came on right away.. any suggestions??
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The code has nothing to do with the alternator. I suggest to double check the all the connector you disconnect during the alternator installation.
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Hi, I have a 2010 Nissan versa with 1.8 L engine. Recently I got the P1421 $07e8 code (manufacturer control). I have no idea where is issue is. The air filter was changed 6 months ago, could you please give some suggestion? Should I reprogram ECM? thank you
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Try using high octane gas for a couple of weeks and if possible add a fuel additive. Also, make sure you check the filter and there is nothing blocking the air flow, even if you change the filter 6 months ago.
If after using high octane gas, checking the air filter and clearing the code, the codes still comes back, then the next step is to reprogram the ECM.
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