P1268 - High to Low Side Short in Cylinder #8
The P1268 code indicates a short circuit between the high and low sides of the ignition coil or injector circuit for cylinder #8. This typically occurs when the insulation between the primary and secondary windings of the coil breaks down, or when there is a wiring fault causing a direct short. The Engine Control Module (ECM) detects an abnormal current flow and sets this code. This can lead to misfires, reduced engine performance, and potential damage to the ECM or other components if not addressed.
01. Most Common Causes
- Faulty ignition coil on cylinder #8
- Short circuit in wiring harness to cylinder #8
- Damaged connector at coil or injector
- Internal ECM failure (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine misfire on cylinder #8
- Rough idle or hesitation
- Reduced fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and record freeze frame data.
Step 2: Visually inspect ignition coil and wiring for damage or shorts.
Step 3: Swap ignition coil from cylinder #8 to another cylinder and see if code follows.
Step 4: If code follows, replace ignition coil. If not, check wiring and connectors for shorts.
04. Commonly Affected Makes
05. 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, damage the catalytic converter, and potentially leave you stranded.
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 $250 if done by a shop including labor.