Ignition Coil Primary Control Circuit High Voltage
Code P2316 indicates that the Powertrain Control Module (PCM) has detected a voltage higher than expected in the primary circuit of a specific ignition coil. This typically points to a short to voltage, open circuit, or a faulty ignition coil driver within the PCM. The primary circuit controls the coil's charge time; excessive voltage can prevent proper spark generation, leading to misfires.
1. Most Common Causes
- Faulty ignition coil
- Short to voltage in wiring or connector
- Open circuit in primary coil wiring
- Failed PCM (internal driver)
2. Symptoms You Will Notice
- Engine misfire
- Check Engine Light on
- Rough idle
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Scan for codes and note which cylinder is affected.
Step 2: Visually inspect the ignition coil connector and wiring for damage or corrosion.
Step 3: Measure voltage at the coil primary circuit with a multimeter; compare to manufacturer specs.
Step 4: Swap the suspect coil with another cylinder and see if the code follows.
Step 5: If code persists, test the PCM output circuit for proper operation.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause misfires, reduced engine performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY replacement of the ignition coil, or $100 to $300 if professional labor is included.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.