P0212
Fix within a few daysThe engine computer detected a low voltage condition in the electrical circuit for the fuel injector on cylinder 12.
Code P0212 means the engine computer detected low voltage in cylinder 12's fuel injector circuit. Common causes: Faulty injector (70%), wiring issues (25%). Drivability: Limit driving, fix within a few days. Repair cost: $50-$200 DIY, $150-$500 professional.
Can I Drive With P0212?
Limit driving, fix within a few days
Essential trips under 10 miles, avoid highways and heavy acceleration. Prioritize repair to prevent further damage.
Stop driving immediately if: Flashing Check Engine Light, loud engine noises, burning smell, significant power loss, or rotten egg smell from the exhaust.
Symptoms of P0212
- 1Check Engine Light is on
- 2Engine misfires or runs rough
- 3Reduced engine power
- 4Poor fuel economy
- 5Engine hesitation or stumbling
- 6Rough idle
Common Causes of P0212
Parts most likely causing this code, ranked by probability
An internal electrical fault within the injector itself, such as a short or open circuit, causes the low voltage condition.
70% of P0212 cases are fixed by replacing this part
Damaged wires, corroded terminals, or a loose connection in the injector's electrical circuit can cause a low voltage reading.
25% of P0212 cases are fixed by repairing this wiring
A faulty driver circuit within the engine computer responsible for controlling injector 12 can send an incorrect voltage signal.
5% of P0212 cases are fixed by replacing this part
Check These First (Before Buying Parts)
- Visually inspect the electrical connector at the cylinder 12 fuel injector for any looseness, corrosion, or damage.
- Check the wiring leading to the cylinder 12 injector for any obvious cuts, chafing, or signs of rodent damage.
How to Diagnose P0212
- 1Visually inspect the wiring harness and connector for cylinder 12's fuel injector for any damage, corrosion, or loose connections.
- 2Using a multimeter, check the resistance of the fuel injector on cylinder 12; compare it to specifications and other injectors.
- 3With the engine running, use a noid light or multimeter to check for proper voltage and pulse at the injector 12 connector.
- 4If possible, swap the cylinder 12 injector with an injector from another cylinder and see if the P0212 code moves to the new cylinder location.
P0212 on Popular Vehicles
Toyota Camry
2007-2024P0212 is not applicable to Toyota Camry models as they do not have 12 cylinders. This code would not appear on these vehicles.
N/A
Honda Accord
2003-2024P0212 is not applicable to Honda Accord models as they do not have 12 cylinders. This code would not appear on these vehicles.
N/A
Ford F-150
2004-2024P0212 is not applicable to most Ford F-150 models as they typically do not have 12 cylinders. This code would not appear on these vehicles.
N/A
Chevrolet Silverado
2007-2024P0212 is not applicable to most Chevrolet Silverado models as they typically do not have 12 cylinders. This code would not appear on these vehicles.
N/A
General Note for V12 Engines
AllP0212 is specific to cylinder 12 and is typically found on vehicles equipped with V12 engines (e.g., some BMW, Mercedes-Benz, Audi, Rolls-Royce models) or certain heavy-duty V10/V8 applications where cylinder 12 is part of the engine's firing order. Diagnosis on these vehicles requires careful attention to the specific cylinder numbering and complex electrical systems.
95% fixed by injector or wiring repair
Frequently Asked Questions
What does P0212 mean?
P0212 indicates that the engine's computer has detected a low voltage condition in the electrical circuit that controls the fuel injector for cylinder 12. This means the injector is not receiving or processing the correct electrical signal.
Can I drive with P0212?
Limit driving, fix within a few days. Driving with a P0212 code means cylinder 12 is misfiring. This sends unburned fuel into your exhaust, which can quickly overheat and damage your catalytic converter. Short, essential trips are acceptable, but avoid extended driving.
Will P0212 clear itself?
No, P0212 will not clear itself. The engine computer will keep the Check Engine Light on until the underlying electrical fault with the cylinder 12 injector circuit is diagnosed and repaired. You will need to clear the code with a scan tool after the repair.
How do I fix P0212 myself?
Start by inspecting the wiring and connector for cylinder 12's fuel injector. If the wiring is good, test the injector's resistance with a multimeter. If the resistance is out of specification, replace the cylinder 12 fuel injector. If the injector tests good, further electrical diagnosis of the circuit is needed.
How much does it cost to fix P0212?
A DIY fix for P0212, typically involving a new fuel injector, costs $50-$200 for the part. Professional repair at a shop will cost $150-$500, including parts and labor, depending on the vehicle and shop rates.
P0212 keeps coming back - why?
If P0212 keeps returning, it indicates the initial repair did not address the root cause. Common reasons include a faulty wiring repair, a new injector that is also defective, or an undiagnosed issue with the Engine Control Module (ECM/PCM) that controls the injector.
Will P0212 fail emissions/smog test?
Yes, P0212 will cause your vehicle to fail an emissions or smog test. The Check Engine Light being on is an automatic failure in most jurisdictions. Additionally, a misfiring cylinder increases harmful emissions.
What's the difference between P0212 and P030C?
P0212 specifically indicates an electrical circuit problem with the fuel injector for cylinder 12 (low voltage). P030C, on the other hand, indicates a general misfire detected in cylinder 12, which could be caused by an injector issue, but also by a spark plug, ignition coil, or compression problem.
P0212 on Mercedes-Benz S600?
P0212 on a Mercedes-Benz S600 (which often features V12 engines) points directly to an electrical issue with the fuel injector for cylinder 12. These vehicles are known for complex wiring and sensitive electronics. Diagnosis should focus on the injector itself, its wiring harness, and the engine control unit, which can be more involved on these high-performance engines.
Questions to Ask Your Mechanic
Did you check the resistance of the cylinder 12 fuel injector and compare it to specifications?
Good answer: Yes, the injector resistance was [X ohms], which is outside the factory specification of [Y-Z ohms]. We confirmed it's an internal fault.
What did you find when inspecting the wiring harness and connector for injector 12?
Good answer: We found some corrosion on the connector pins, which we cleaned, but the code returned. We then traced the wiring and found a small break near the firewall.
Repair Cost Estimate
DIY Repair
Parts only
$50-$200
Shop Repair
Parts + labor
$150-$500
Save $100-$300 by doing it yourself
Difficulty
intermediate
Time
1-3 hours
Intermediate - requires a multimeter for electrical testing and potentially specialized tools for injector removal, but is manageable for a DIYer with some mechanical experience.
Cost of Waiting
Continued driving with a P0212 code means cylinder 12 is misfiring. This sends unburned fuel into your catalytic converter, causing it to overheat and melt internally. A $50-$200 fuel injector replacement now prevents a $800-$2,500 catalytic converter replacement later.
While You're In There...
These seals are removed and often damaged during injector replacement; replacing them prevents fuel leaks and vacuum leaks.
If the intake manifold needs to be removed to access the injectors, replacing the gasket prevents vacuum leaks and repeat labor.
Tools You'll Need
- OBD-II scan tool
- Multimeter
- Basic hand tools (sockets, wrenches)
- Fuel injector puller (may be needed for some vehicles)
- Noid light (optional, for checking injector pulse)
P0212 is a common electrical fault for a specific fuel injector. It's a fixable problem, and addressing it promptly will prevent more expensive repairs down the road.
- Family-owned since 1957
- 990,000+ happy customers
- Fast nationwide shipping
- Easy returns
Your Next Steps
Step 1: Visually inspect the wiring and connector for cylinder 12's fuel injector. Look for any signs of damage, corrosion, or loose connections. Ensure the connector is fully seated.
Step 2: If the visual inspection reveals no issues, use a multimeter to test the resistance of the cylinder 12 fuel injector. Compare the reading to the manufacturer's specifications. If the resistance is outside the specified range, the injector is faulty.
Step 3: If the injector resistance is good, use a noid light or multimeter to check for proper voltage and pulse at the injector 12 connector while the engine is cranking or running. If there's no pulse or incorrect voltage, the issue is likely in the wiring harness or the engine computer.