The P1368 trouble code is a manufacturer-specific powertrain code. Its exact definition depends entirely on the vehicle application, primarily indicating an ignition amplifier signal fault, an ignition coil circuit issue, or an ignition control module fault.
Because it is manufacturer-specific, the exact application must be verified. The code identifies a detected condition, and testing is required to identify the root cause before replacing any components.
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Key Takeaways
- P1368 is a manufacturer-specific code with definitions varying significantly between automakers.
- On Jaguar applications, it indicates an ignition amplifier ECM signal fault for Bank 2.
- On Volkswagen and Audi applications, it points to an ignition coil circuit short to positive on cylinder 5.
- On General Motors applications, it indicates an ignition control module fault where cylinder 8 is not toggling after enable.
- Proper diagnosis requires verifying the exact factory definition and testing the relevant ignition components and circuits.
P1368 Code Description and Implications
The P1368 code is a manufacturer-specific powertrain definition. Because it is not a generic SAE code, its exact meaning depends entirely on the vehicle application.
Jaguar applications: P1368 indicates an ignition amplifier ECM signal fault for Bank 2. The engine control module detects an irregularity or missing signal from the ignition amplifier circuit controlling the second bank of cylinders.
Volkswagen and Audi applications: P1368 indicates an ignition coil or amplifier circuit short to positive on cylinder 5. The control module detects that the primary ignition control circuit is shorted to voltage.
General Motors applications: P1368 indicates an ignition control module fault where cylinder 8 is not toggling after enable. The control module detects that the ignition control signal for the eighth cylinder is not responding correctly.
Common Causes of the P1368 Code
Electrical faults, ignition component degradation, and control module issues are the primary triggers, though the specific causes vary by manufacturer.
For Jaguar applications: The issue stems from a faulty ignition amplifier or coil pack on Bank 2, damaged wiring harnesses, or poor electrical connections at the module connectors.
For VW and Audi applications: The fault is caused by a failed ignition coil on cylinder 5, a short to positive in the ignition control wiring, or a faulty power output stage.
For GM applications: The issue is caused by a failing ignition control module, damaged wiring between the control module and the ignition coil for cylinder 8, or poor electrical connections.
Symptoms Associated With P1368
When the control module detects a fault in these specific ignition monitoring systems, it illuminates the Check Engine Light.
Jaguar applications: You may experience engine misfires on Bank 2, rough idling, and hesitation. The dashboard may also display an “ENGINE FAULT – POOR VEHICLE PERFORMANCE” warning message.
VW and Audi applications: You will likely experience a severe misfire on cylinder 5, rough idling, and a noticeable loss of power during acceleration.
GM applications: You may experience engine misfires, rough idling, hesitation, or an illuminated Check Engine Light if the ignition control signals are missing or erratic.
Diagnosing the P1368 Trouble Code
Accurate diagnosis begins by confirming the exact factory definition for your specific vehicle make and model, as this is a manufacturer-specific error code.
Jaguar diagnosis: Inspect the Bank 2 ignition amplifier and coil wiring for damage. Test the control signals from the ECM to verify proper operation and signal integrity.
VW and Audi diagnosis: Inspect the ignition coil and wiring for cylinder 5 for a short to positive. Test the ignition coil resistance and check the control circuit for voltage shorts.
GM diagnosis: Inspect the ignition control module wiring and connectors. Verify the integrity of the ignition control signals using an oscilloscope or advanced scan tool capable of monitoring ignition toggle rates.
Repairing the P1368 Issue
Repairs must address the specific root cause identified during testing.
Jaguar repair: If the ignition amplifier or coil pack on Bank 2 fails testing, replace the confirmed failed component. Repair any damaged wiring harnesses.
VW and Audi repair: If the ignition coil or power output stage on cylinder 5 fails testing, replace the confirmed failed component. Repair any wires shorted to positive.
GM repair: If the ignition control module fails to toggle the signal for cylinder 8 and the wiring is intact, replace the confirmed failed ignition control module.
Cost Considerations for P1368 Repairs
Cost depends on diagnostic time, component accessibility, required parts, programming requirements, and labor.
Replacing a single ignition coil is generally a straightforward repair with moderate parts and labor costs. Replacing an integrated ignition amplifier or control module may require significantly more labor and specialized programming.
Prevention Strategies for Future Occurrences
Inspecting ignition wiring harnesses for early signs of melting, chafing, or degradation near hot exhaust components can help prevent circuit faults and shorts to positive.
Keeping electrical connectors clean and ensuring protective seals are intact may reduce moisture intrusion and prevent corrosion-related ignition control faults.
Troubleshooting Tips and Best Practices
Do not immediately replace the engine control module just because a P1368 code is present. A failed ignition coil, a shorted wire, or a poor connection will produce the exact same fault reading.
Always verify the manufacturer-specific definition first. A code that means an ignition amplifier signal fault on a Jaguar means an ignition coil circuit short on an Audi.
Check for Technical Service Bulletins for your specific vehicle. Manufacturers occasionally release updated ignition component part numbers or revised wiring harness routing procedures to address chronic ignition circuit issues.
More OBD-II Codes
| P1367 | P1366 | P1365 | P1364 |
| P1363 | P1360 | P1371 | P1372 |
| P1373 | P1374 | P1375 | P1376 |
| P1359 | P1353 | P1324 | P1323 |
| P0300 | P0301 | P0302 | P0303 |
| P0304 | P0305 | P0306 | P0313 |
Frequently Asked Questions
Is P1368 a generic or manufacturer-specific code?
No. P1368 is a manufacturer-specific powertrain code. It indicates an ignition amplifier signal fault on Jaguar, a cylinder 5 coil short on VW/Audi, and an ignition control issue on GM.
Can I drive my car with a P1368 code?
Driving is not recommended if the code indicates a severe misfire. Continued driving with an active misfire can overheat and damage the catalytic converter due to unburned fuel entering the exhaust.
Will disconnecting the battery clear the P1368 code?
Disconnecting the battery may temporarily erase the code, but it will not repair damaged wiring, a short circuit, or a failed amplifier. The code will return once the monitor runs.
Can a bad catalytic converter cause a P1368 code?
No. P1368 monitors the ignition amplifier signals or ignition coil circuits depending on the make. A catalytic converter efficiency issue triggers different codes, such as P0420 or P0430.
Does P1368 always mean the ignition amplifier is bad?
No. The code identifies a detected circuit condition. This is frequently caused by damaged wiring, a short to positive, or a poor connection. Components should only be replaced after testing confirms failure.
What Should You Do About the P1368 Code?
Confirm the exact factory definition for your vehicle, then follow the applicable manufacturer diagnostic procedure. Because P1368 is manufacturer-specific, the diagnostic path for an ignition amplifier signal fault differs entirely from an ignition coil circuit short.
Inspect the relevant system and components, including ignition amplifiers, coils, and wiring circuits. Repair any confirmed wiring damage, or replace the relevant system components only after testing verifies the failure.
