Diagnostic trouble code P1372 is a manufacturer-specific powertrain fault code. Because it is manufacturer-specific, its exact definition depends entirely on the vehicle make, model, and application.
Exact vehicle application must be verified before diagnosis. The code identifies a detected condition in a specific subsystem, but further testing is required to identify the root cause.
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Key Takeaways
- P1372 is a manufacturer-specific code, meaning its definition varies between automakers like General Motors, Honda, and Volkswagen.
- On GM and Cadillac applications, it indicates a crankshaft position sensor A-B correlation or segment time fault.
- On Honda and Acura applications, it points to an ignition coil cylinder 2 early activation fault.
- On VW applications, it indicates a cylinder 6 ignition circuit short to ground.
- Diagnosis requires verifying the exact factory definition and testing the relevant sensor or ignition circuits.
P1372 Code Description and Implications
Because P1372 is manufacturer-specific, there is no single universal definition. This error code identifies a detected condition, but the exact monitored system depends on the vehicle make and model.
Some General Motors and Cadillac applications: P1372 indicates a “Crankshaft Position Sensor A-B Correlation” or segment time fault, meaning the module detects a mismatch between dual crankshaft sensor signals.
Certain Honda and Acura applications: P1372 indicates an “Ignition Coil – Cylinder 2 – Early Activation Fault,” pointing to an unexpected signal timing in the cylinder 2 ignition control circuit.
Some Volkswagen applications: P1372 indicates a “Cylinder 6 Ignition Circuit Short To Ground,” relating to an electrical short in the ignition coil control circuit for that specific cylinder.
Common Causes of the P1372 Code
The underlying cause depends entirely on the verified factory definition for the specific vehicle application.
For GM applications, possible causes include a failing crankshaft position sensor, damaged sensor wiring, a stretched timing chain, or a damaged reluctor wheel.
For Honda applications, causes may involve a failing ignition coil on cylinder 2, damaged coil wiring, or poor electrical connections at the coil harness.
For VW applications, causes can include a short to ground in the cylinder 6 ignition coil wiring, a failing ignition coil, or an internal ECM driver fault.
Symptoms Associated With P1372
Symptoms vary depending on the underlying system fault and the vehicle manufacturer.
On GM applications with a crankshaft sensor correlation fault, symptoms can include engine stalling, a no-start condition, or severe misfires across multiple cylinders.
On Honda applications with a cylinder 2 ignition fault, symptoms may include a noticeable misfire, rough idling, and decreased engine performance.
On VW applications, symptoms can include a severe misfire on cylinder 6, hesitation during acceleration, and an illuminated Check Engine Light.
Diagnosing the P1372 Trouble Code
Diagnosis must begin by confirming the exact factory definition for the specific make, model, and year.
For GM applications, technicians inspect the crankshaft position sensor wiring, test the sensor signals with an oscilloscope, and verify the timing chain and reluctor wheel condition.
For Honda applications, technicians swap the cylinder 2 ignition coil to another cylinder to see if the misfire follows the component, then test the wiring and ECM signals.
For VW applications, technicians test the cylinder 6 ignition coil circuit for a short to ground, inspect the wiring harness, and verify the coil resistance.
Repairing the P1372 Issue
Repairs must follow confirmed diagnosis based on the specific vehicle application.
If a crankshaft position sensor or timing component fault is confirmed on a GM application, the sensor, wiring, or timing components must be replaced or repaired.
If an ignition coil fault is confirmed on a Honda or VW application, the confirmed failed coil or damaged wiring must be replaced or repaired.
Cost Considerations for P1372 Repairs
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Replacing an ignition coil or crankshaft position sensor may require minimal labor depending on accessibility.
Conversely, replacing a timing chain or repairing a damaged engine wiring harness requires significant labor and specialized tools.
Prevention Strategies for Future Occurrences
Some electrical and mechanical failures cannot be reliably prevented.
Inspecting exposed wiring harnesses for chafing or heat damage can help prevent intermittent circuit faults in the ignition or sensor systems.
Performing regular oil changes and maintaining proper engine oil levels helps prevent sludge buildup that can affect timing chain tensioners and reluctor wheels on applicable engines.
Troubleshooting Tips and Best Practices
Never assume P1372 is a universal crankshaft or ignition code. Always verify the exact definition for the specific vehicle before purchasing parts.
Do not ignore related codes. A crankshaft sensor fault may appear alongside camshaft position sensor codes, while an ignition fault may appear alongside specific cylinder misfire codes.
Check for technical service bulletins applicable to your exact vehicle application, as manufacturers frequently release updated sensors or revised wiring harnesses for recurring faults.
More OBD-II Codes
| P1365 | P1373 | P0335 | P1358 |
| P1366 | P1374 | P0340 | P1357 |
| P1367 | P1375 | P0300 | P1356 |
| P1368 | P1376 | P0301 | P1355 |
| P1370 | P1377 | P0302 | P1354 |
| P1371 | P1378 | P0306 | P1350 |
Frequently Asked Questions
Is P1372 a generic or manufacturer-specific code?
No. P1372 is a manufacturer-specific code. Its exact definition varies significantly between automakers, so the factory service information for the specific vehicle must be consulted.
Can I drive my car with a P1372 code?
It depends on the application. If P1372 indicates a crankshaft sensor correlation fault, the engine may stall or fail to start. If it is an ignition fault, performance may be reduced.
Will disconnecting the battery clear the P1372 code?
Disconnecting the battery may temporarily clear the code, but it does not repair the underlying electrical or mechanical fault. The code will return once the monitor runs again.
Can a bad crankshaft position sensor cause other codes?
On GM applications monitoring dual crankshaft sensors, a failing sensor or stretched timing chain can trigger additional camshaft correlation or random misfire codes.
Does P1372 always mean the ignition coil or sensor is bad?
No. While a failing component is a cause on specific applications, the code can also indicate damaged wiring, a short to ground, or a stretched timing chain.
What Should You Do About the P1372 Code?
Confirm the exact factory definition and diagnostic procedure for your specific vehicle application. Because P1372 is manufacturer-specific, identifying whether it relates to a crankshaft sensor correlation, a specific cylinder ignition coil, or a circuit short is mandatory.
Follow the applicable manufacturer diagnostic steps to test the relevant system and components. Once the root cause is confirmed, complete the necessary repairs and verify that the system operates correctly and the code does not return.
