P0266
High SeverityCylinder 2 Contribution/Balance
Engine System
What Does P0266 Mean?
Cylinder 2 is not contributing adequate power.
Common Fix
Repair cylinder 2 issue
Estimated Cost (DIY)
$40 - $500
Common Causes
How to Diagnose P0266
- 1Compression test
- 2Check injector
- 3Check spark plug and coil
OEM Diagnostic Flowchart
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Related Resources
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OEM Manual Evidence
Browse →A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Savana 2500 V8-6.6L DSL Turbo Service Manual | Operation CHARM Operation CHARM : Ca...
A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Savana 3500 V8-6.6L DSL Turbo Service Manual | Operation CHARM Operation CHARM : Ca...
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A L L Diagnostic Trouble Codes ( DTC ) — 2013 GMC Truck Sierra 2500 2WD V8-6.6L DSL Turbo Service Manual | Operation CHARM Operation CHARM...
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Related Symptoms
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Related Codes
Cylinder 2 is misfiring.
Low voltage in cylinder 2 injector circuit.
Cylinder 1 is not contributing its fair share of power. The ECM detected a significant power imbalance.
Frequently Asked Questions
- How do I do a compression test?
- Remove the spark plug, screw in a compression gauge, crank the engine 5-7 times. Compare all cylinders — they should be within 10% of each other.
- What is normal compression?
- Most gasoline engines should read 125-180 PSI per cylinder. Below 100 PSI indicates a problem.
Related Repair Guides
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