P0275
Cylinder 5 Contribution/Balance
If your code reader dashboard displays the generic DTC error code P0275, your vehicle is currently experiencing an active failure related to "Cylinder 5 Contribution/Balance". Proper system troubleshooting is required to safely clear this warning.
Driver's Summary
Storing code P0275 is your car's way of telling you something is wrong with the cylinder 5 contribution/balance. Typical symptoms include engine shaking, lack of power on acceleration. This is a serious fault — avoid extended driving and have your vehicle inspected by a mechanic as soon as possible to prevent further damage.
Symptoms
Engine shaking, lack of power on acceleration
Common Causes
- Faulty fuel injector on Cyl 5
- Low cylinder compression
- Ignition coil failure
- Carbon buildup on valves
How to Fix
- 1 Replace fuel injector
- 2 Perform compression test
- 3 Replace ignition coil
- 4 Perform induction service
Technical Explanation
Code P0275 is confirmed when the ECM's diagnostic algorithm detects a parameter deviation that persists across a defined number of consecutive drive cycles. For injector-specific codes, the ECM monitors the injector control circuit voltage drop during each pulse; a shorted or open injector presents a characteristic resistance signature that differs measurably from a healthy unit. The MIL illuminates after the fault is confirmed on two consecutive drive cycles, and the freeze frame data captured at first detection is stored in the PCM's memory for diagnostic reference.
Is It Safe to Drive?
An active P0275 code under high-severity conditions means the affected system is operating outside safe parameters. Continued driving — especially under load or at highway speeds — significantly increases the risk of secondary damage to components like low cylinder compression.
Mechanic's Pro Tip
The fastest isolation technique for P0275 is the coil swap test: move the ignition coil from the affected cylinder to a neighboring cylinder and clear the code. If the misfire follows the coil, it's the coil. If it stays on the same cylinder, focus on the spark plug, injector, or compression. Never replace coils without also replacing the spark plug in that cylinder — a fouled plug will kill a new coil within weeks.
Injector: 150 - 400; Carbon cleaning: 150