What Does P2315 Mean?
The PCM detected low voltage in the primary control circuit of ignition coil F. This suggests a short to ground or excessive current draw preventing proper coil operation.
Common Causes
35%
Short circuit to ground in coil F primary wiring
30%
Failed ignition coil F with internal short circuit
20%
Damaged coil F connector with terminal corrosion or water intrusion
10%
Pinched or damaged wiring harness causing intermittent ground
5%
PCM driver circuit failure or internal short
Diagnostic Steps
1
Step 1: Disconnect coil F connector and inspect for water damage, corrosion, or damaged pins
2
Step 2: Measure primary coil resistance of coil F (should be 0.5-2 ohms typically)
3
Step 3: With coil disconnected, check for short to ground on PCM control wire (should show open circuit)
4
Step 4: Inspect wiring harness routing for contact with sharp edges or heat sources
5
Step 5: Perform coil swap test by moving coil F to another position and clearing codes
Estimated Repair Cost
$120 - $450
Parts + labor, varies by vehicle and location
The PCM detected low voltage in the primary control circuit of ignition coil F. This suggests a short to ground or excessive current draw preventing proper coil operation.
The most common cause of P2315 (Ignition Coil "F" Primary Control Circuit Low) is: Short circuit to ground in coil F primary wiring
Typical repair costs for P2315 range from $120 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cylinder F misfire will cause rough operation, reduced power, and potential catalyst damage. Avoid prolonged driving until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2315 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
