What Does P0276 Mean?
This code signals a cylinder 5 contribution or balance fault where cylinder 5 is producing less power output than other cylinders, as measured by crankshaft acceleration patterns. In some ECM implementations, P0276 denotes the low-contribution side of the balance test for cylinder 5. The driver will experience rough running, reduced performance, and possible vibration from the unbalanced engine.
Common Causes
35%
Cylinder 5 fuel injector failing — restricted, weak spray, or partial blockage
25%
Mechanical compression loss on cylinder 5 — worn rings, burnt valve, or head gasket breach
20%
Injector circuit electrical issue reducing cylinder 5 fuel delivery
12%
Air intake or charge air system issue specific to cylinder 5
8%
Exhaust restriction or EGR distribution issue at cylinder 5
Diagnostic Steps
1
Monitor all cylinder contribution rates in live data and confirm cylinder 5's deviation is beyond the normal tolerance (typically >3-5% deviation indicates a fault).
2
Use a relative compression test during cranking to quickly screen for mechanical issues without disassembly — compare the cranking speed uniformity across all cylinders.
3
Test the cylinder 5 injector by swapping it with another cylinder — clear codes and run the engine. If the balance fault follows the injector, it needs replacement.
4
If injector swap does not resolve, perform a cylinder leak-down test at TDC on cylinder 5 — listen at the intake, exhaust, oil fill, and coolant reservoir to identify where compression is escaping.
5
On turbocharged engines, verify that charge air distribution is even — check for damaged intercooler hoses or manifold passages that could starve cylinder 5 of boost pressure.
Estimated Repair Cost
$150 - $1,500
Parts + labor, varies by vehicle and location
This code signals a cylinder 5 contribution or balance fault where cylinder 5 is producing less power output than other cylinders, as measured by crankshaft acceleration patterns. In some ECM implementations, P0276 denotes the low-contribution side of the balance test for cylinder 5. The driver will...
The most common cause of P0276 (Cylinder 5 Contribution/Balance Fault) is: Cylinder 5 fuel injector failing — restricted, weak spray, or partial blockage
Typical repair costs for P0276 range from $150 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Moderate-risk issue allowing short-distance driving. Extended operation with a weak cylinder risks exhaust system damage and can cause the ECM to enter limp mode, further reducing power. Schedule repairs soon.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0276 to identify the root cause.
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Quick Info
Category
Powertrain
System
Fuel Injection / Engine Mechanical
Difficulty
Type
Generic (SAE)
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