What Does P2306 Mean?
The PCM has detected an abnormally low voltage condition in the primary control circuit for ignition coil C. This suggests a short to ground in the control circuit or an internal coil/PCM fault.
Common Causes
35%
Short to ground in primary control wire between PCM and coil C
30%
Failed ignition coil C with internal short circuit
20%
Damaged or pinched wiring harness causing intermittent short
15%
Failed PCM ignition coil driver circuit shorted internally
Diagnostic Steps
1
Step 1: Disconnect ignition coil C connector and check for voltage at control wire with key on (should be battery voltage or pulsing ground)
2
Step 2: Test for short to ground on control wire from PCM to coil C with coil disconnected
3
Step 3: Check primary winding resistance in ignition coil C and compare to specifications
4
Step 4: Inspect wiring harness for damage, chafing, or pinch points that could cause short to ground
5
Step 5: If wiring tests good and coil is within specs, suspect failed PCM driver circuit
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The PCM has detected an abnormally low voltage condition in the primary control circuit for ignition coil C. This suggests a short to ground in the control circuit or an internal coil/PCM fault.
The most common cause of P2306 (Ignition Coil "C" Primary Control Circuit Low) is: Short to ground in primary control wire between PCM and coil C
Typical repair costs for P2306 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Vehicle will misfire on cylinder C causing rough running and potential stalling. Can damage catalytic converter if driven extensively with active misfire.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2306 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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