What Does P2331 Mean?
Ignition Coil 'K' Primary Control Circuit High indicates the ECM detected an abnormally high voltage on the control circuit for ignition coil K (cylinder 11). The coil driver signal is stuck high or open, meaning the ECM cannot pull the circuit low to trigger the coil's magnetic collapse and spark generation.
Common Causes
35%
Open circuit in the control wire from ECM to ignition coil K
30%
Ignition coil K with open primary winding preventing current flow
20%
Disconnected or damaged connector at coil K with poor terminal contact
15%
ECM coil driver open circuit failure
Diagnostic Steps
1
Step 1: Verify coil K connector is fully seated and locked. Check for pushed-back pins or terminal spread.
2
Step 2: Measure primary resistance of coil K (0.4-2.0 ohms expected). OL reading confirms open coil.
3
Step 3: Test control wire continuity from coil connector to ECM connector. Resistance should be under 2 ohms.
4
Step 4: Swap coil K with an adjacent known-good coil. Clear codes and monitor. If fault follows the coil, replace it.
5
Step 5: If coil and wiring are good, backprobe the ECM connector and verify the driver output toggles during cranking using a digital storage oscilloscope.
Estimated Repair Cost
$75 - $400
Parts + labor, varies by vehicle and location
Ignition Coil 'K' Primary Control Circuit High indicates the ECM detected an abnormally high voltage on the control circuit for ignition coil K (cylinder 11). The coil driver signal is stuck high or open, meaning the ECM cannot pull the circuit low to trigger the coil's magnetic collapse and spark g...
The most common cause of P2331 (Ignition Coil "K" Primary Control Circuit High) is: Open circuit in the control wire from ECM to ignition coil K
Typical repair costs for P2331 range from $75 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cylinder 11 will not fire, resulting in rough operation and reduced power output. Avoid heavy load conditions and repair promptly to prevent catalytic converter damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2331 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
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