P1347 is a manufacturer-specific OBD-II diagnostic trouble code. Its exact definition depends on the vehicle application, commonly relating to a cylinder 3 misfire with fuel cut-off or a camshaft/crankshaft timing correlation fault on Bank 2.
Because definitions vary by manufacturer, the exact diagnostic path requires verifying your specific vehicle’s factory service information. The code identifies a detected condition, not necessarily a failed part.
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Key Takeaways
- P1347 is a manufacturer-specific code indicating a fault such as a cylinder 3 misfire with fuel cut-off or a Bank 2 timing correlation issue.
- Possible causes include failed ignition components, faulty camshaft/crankshaft sensors, mechanical timing wear, or valve lift system faults.
- Symptoms vary by application but may include an illuminated check engine light, rough idling, reduced power, or limp mode activation.
- Diagnosis requires verifying the exact factory definition and testing the relevant ignition, sensor, or mechanical timing circuits.
P1347 Code Description and Implications
P1347 is a manufacturer-specific code, meaning its exact definition varies by automaker. The powertrain control module uses this code to flag an anomaly within a specific engine management or ignition system.
Some BMW and MINI applications: P1347 indicates a misfire detected in cylinder 3 that is severe enough to trigger fuel cut-off to protect the catalytic converter.
Certain Volkswagen, Audi, and Porsche applications: This code may point to a Bank 2 crankshaft/camshaft position sensor signal out of sequence, a valve lift control fault, or a camshaft timing correlation issue.
Because the code is manufacturer-specific, you must verify the exact factory definition for your vehicle before beginning diagnosis. The specific trouble code meaning dictates the test.
Common Causes of the P1347 Code
Misfire faults (BMW/MINI applications): A failed ignition coil, worn spark plug, or clogged fuel injector on cylinder 3 can prevent proper combustion. Low compression or a vacuum leak may also contribute.
Timing correlation faults (VW/Audi/Porsche applications): A stretched timing chain, worn tensioner, failed camshaft/crankshaft position sensor, or a malfunctioning variable valve lift actuator can cause the camshaft and crankshaft signals to fall out of sequence.
Symptoms Associated With P1347
Because this code affects either the ignition system or the valve timing, symptoms vary significantly by application.
On misfire applications, you may experience rough idling, severe hesitation, lack of power, or the engine entering a limp mode as the module cuts fuel to cylinder 3.
On timing correlation applications, you may notice poor engine performance, extended cranking times, or an illuminated check engine light.
Diagnosing the P1347 Trouble Code
Diagnosis must begin by confirming the exact factory definition and wiring diagram for your specific make, model, and year. Retrieve freeze frame data to understand the conditions when the code set.
For BMW/MINI misfire applications, swap the ignition coil and spark plug from cylinder 3 to another cylinder. If the misfire moves, the component is faulty. Perform a compression test if the ignition system tests correctly.
For VW/Audi/Porsche timing applications, inspect the timing chain for stretch and verify the mechanical timing marks. Use a scan tool to monitor the camshaft and crankshaft sensor data for correlation errors.
Repairing the P1347 Issue
Repairs must follow confirmed diagnostic testing. Do not replace the timing chain or ignition components without verifying the root cause first.
If an ignition coil or spark plug fails testing, replace it with a component meeting the exact vehicle specification.
If the timing chain is stretched or the tensioner is failed, replace the mechanical timing components according to the manufacturer’s procedures.
Cost Considerations for P1347 Repairs
Repair costs depend on the confirmed root cause, component accessibility, and local labor rates. Replacing an ignition coil or spark plug is generally straightforward.
If the timing chain, tensioners, or valve lift actuators require replacement, parts and labor costs will increase due to the extensive engine disassembly required.
Prevention Strategies for Future Occurrences
Maintaining the correct engine oil level and adhering to strict oil change intervals helps prevent premature wear on timing chain tensioners and variable valve lift components.
Replacing spark plugs and ignition coils at the manufacturer’s recommended intervals helps prevent severe misfires that can trigger fuel cut-off.
Troubleshooting Tips and Best Practices
Always verify the exact definition of P1347 for your specific vehicle. Assuming it is always a cylinder 3 misfire can lead to misdiagnosis when a timing chain fault is the actual cause on an Audi application.
Do not ignore related codes. If P1347 is accompanied by other misfire or camshaft position codes, it strongly supports a shared mechanical timing issue or a systemic component failure.
Check for technical service bulletins related to updated timing chain tensioners or revised ignition coil designs for your specific model year.
More OBD-II Codes
| P1346 | P1345 | P1344 | P1325 |
| P1324 | P1323 | P1348 | P1349 |
| P1350 | P1351 | P1352 | P1353 |
| P0300 | P0301 | P0302 | P0303 |
| P0304 | P0305 | P0012 | P0010 |
| P1580 | P1542 | P1529 | P1525 |
Frequently Asked Questions
Is P1347 a generic or manufacturer-specific code?
No. P1347 is a manufacturer-specific code. Its exact definition and diagnostic procedure vary depending on the vehicle make, model, and year. Always consult the factory service information.
Can a bad ignition coil cause a P1347 code?
Yes. On BMW and MINI applications, a failed ignition coil on cylinder 3 can cause a severe misfire, prompting the module to cut fuel and store this code.
Is it safe to drive with a P1347 code?
Driving is not recommended if the engine is misfiring severely or in limp mode. A severe misfire can quickly overheat and destroy the catalytic converter, while timing faults can cause internal engine damage.
Will replacing the camshaft position sensor always fix P1347?
Not always. On VW/Audi applications, P1347 can indicate a stretched timing chain or a failed valve lift actuator. The root cause could be mechanical wear rather than an electrical sensor failure.
Can low engine oil cause a P1347 code?
Yes. On applications using hydraulic valve lift or variable valve timing, low oil pressure can prevent the system from operating correctly, triggering a timing correlation or valve lift fault.
What Should You Do About the P1347 Code?
Confirm the exact factory definition and wiring diagram for your specific vehicle application. Inspect the relevant ignition components, timing chains, and sensors for physical damage or circuit faults.
Perform targeted electrical and mechanical testing on the relevant system and components to isolate the fault. Repair the confirmed root cause, then verify the repair by clearing the codes and monitoring live data.
