The OBD code P0303 for a Chevrolet indicates a misfire in cylinder 3. This affects the engine’s performance, causing symptoms like engine light on, lack of power, hard starting, and engine hesitation.
Common causes include a faulty spark plug, clogged fuel injector, or ignition coil issues.
While not an immediate danger, it can lead to further engine damage if left unresolved.
A possible fix involves inspecting and repairing the components related to cylinder 3.
| Repair Importance Level | 10.0 (Out of 10) |
| Estimated Repair Time | Approximately 1.0 hour |
| Repair Difficulty Level | 10.0 (Out of 10) |
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Symptoms of the Chevrolet p0303 OBD Code
The engine runs rough and there is a noticeable lack of power.
- With Chevrolet OBD code P0303, the Service Engine Soon Warning Light may illuminate.
- Lack/loss of power can be experienced while driving.
- Hard starting the engine might occur.
- Engine hesitation may be noticeable during acceleration.
Causes of the Chevrolet p0303 OBD Code
Fault code P0303 on a Chevrolet typically indicates a misfire in cylinder 3.
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- P0303 can be caused by Faulty Spark Plug #3.
- Clogged or faulty Fuel Injector #3.
- Faulty Ignition Coil #3.
- Fuel Injector #3 harness is open or shorted.
- Fuel Injector #3 circuit poor electrical connection.
- Ignition Coil #3 harness is open or shorted.
- Ignition Coil #3 circuit poor electrical connection.
- Insufficient cylinder 3 compression.
- Incorrect fuel pressure.
- Intake air leak.
Fixing Chevrolet Error Code p0303 Step By Step
Address the misfire in cylinder 3 by checking spark plugs, ignition coil, and fuel injector.
- To fix a Chevrolet OBDII code P0303, start by reviewing the possible causes related to cylinder 3 misfire.
- Visually inspect the ignition system components such as spark plugs, ignition coils, and spark plug wires for any signs of wear or damage.
- Check the fuel injector for proper operation and ensure it is delivering fuel to cylinder 3 correctly.
- Test the compression in cylinder 3 to rule out any internal engine issues causing the misfire.
- If all components check out, consider swapping the ignition coil from cylinder 3 with another cylinder to see if the misfire follows.
- Finally, reset the fault codes and test drive the vehicle to verify if the issue has been resolved.
Cost Of Fixing Chevrolet p0303 Fault Code
Diagnosing and repairing Chevrolet fault code P0303 typically involves addressing cylinder 3 misfire issues.
The cost to diagnose and fix a Chevrolet OBD code P0303 is typically based on an estimated repair time of 1. 0 hour, with labor rates ranging from $75 to $150 per hour.
The total cost will depend on shop rates, complexity of the issue, and any additional parts or services needed.
Details of the Chevrolet p0303 OBD Code
Chevrolet code P0303 indicates a misfire in cylinder 3.
Code P0303 means a misfire was detected in cylinder 3 of a Chevrolet vehicle.
It is triggered by the Engine Control Module (ECM) based on variations in crankshaft speed.
This code indicates that cylinder 3 is not contributing properly to the engine’s power generation.
Misfires can be caused by issues such as faulty spark plugs, ignition coils, fuel injectors, or low compression in the cylinder.
Mechanic’s Tech Notes
For Chevrolet code P0303, cylinder 3 misfire detected, likely due to spark plug, ignition coil, or fuel injector issue.
To diagnose and fix OBDII code P0303 on a Chevrolet, start by checking the ignition system components for cylinder 3, such as spark plugs, ignition coils, and wiring.
Use a voltmeter to test the ignition coil’s primary and secondary circuits for proper voltage and resistance.
Inspect the fuel injector for cylinder 3 for any clogs or malfunctions.
A scan tool can help monitor live data to pinpoint the misfire cause.
Additionally, perform a compression test on cylinder 3 to rule out any internal engine issues.
Address any faulty components found during these tests to resolve the P0303 code.
FAQ
Common causes of OBD code P0303 in a Chevrolet: Faulty Spark Plug #3, Clogged Fuel Injector #3, Faulty Ignition Coil #3, or Ignition Coil #3 circuit/connection issues.
Diagnose P0303 by checking Spark Plug #3, Fuel Injector #3, Ignition Coil #3, compression, fuel pressure, and intake leaks. Inspect wiring and connectors for damage.
It is not safe to continue driving with OBD code P0303 on a Chevrolet. Address the causes like faulty spark plug, fuel injector, or ignition coil immediately.
Wrap Up
If your Chevrolet is experiencing a rough idle or misfiring, along with OBD code P0303, it may be caused by a faulty ignition coil, spark plug, fuel injector, or a vacuum leak affecting cylinder 3. To address Chevrolet OBD code P0303, start by inspecting the ignition coil, spark plug, and fuel injector for cylinder 3. Check for any signs of wear, damage, or malfunction.
Test the components and their respective wiring harnesses for proper operation.
