Ignition Coil B Primary Control Circuit Low
The ECU reads a low primary control voltage on ignition coil B. Misfire is typically observed on the cylinder this coil serves.
Affected components
- Ignition coil
- Coil driver
- Ignition wiring
Common causes
- High likelihood: Internal coil short
- Medium likelihood: Primary wire shorted to ground
- Low likelihood: Connector pins corroded - high contact resistance
Diagnostic notes
- The malfunction indicator lamp may illuminate
- This code can affect emissions
- A drive cycle may be required after repair
Related codes
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.