P1301: Bank 2 Ignition Driver Circuit Malfunction
The engine control module (ECM) has detected multiple simultaneous ignition circuit faults on Bank 2, specifically identifying low-side short circuits in the internal power transistors that control the ignition coils. This indicates a failure in the ECM's output stage for that bank, a short circuit in the wiring harness to the Bank 2 coils, or coils with abnormally low primary resistance that damage the drivers.
01. Most Common Causes
- Internal failure of the ECM's ignition driver stage for Bank 2
- Short to ground in the Bank 2 coil control wiring
- Defective ignition coils (low primary resistance) on Bank 2 that overload the driver
- Damaged, corroded, or moisture-contaminated ECM or coil connectors on Bank 2
- Voltage spike or overvoltage in the Bank 2 ignition system
02. Symptoms You Will Notice
- Engine misfire on Bank 2 cylinders
- Check Engine Light illuminated
- Rough idle, hesitation, or loss of power
- Possible no-start condition if multiple coils are affected
03. Step-by-Step Diagnosis
Scan for additional codes and check freeze frame data
Visually inspect Bank 2 coil connectors and wiring for damage, corrosion, or shorts
Measure primary resistance of each Bank 2 ignition coil; compare to specifications
Check for short to ground on the Bank 2 coil control circuits at the ECM connector
If wiring and coils are good, suspect a failed ECM driver; perform ECM output test if available
1. Frequently Asked Questions
Is it safe to drive?▼
No, this is a high-severity fault. Driving can cause further damage to the ECM, catalytic converter, or other components due to misfiring and unburned fuel. Have the vehicle towed to a repair shop.
How much does it cost to fix?▼
Repair costs typically range from $200 to $1,200 depending on the root cause. Replacing ignition coils and wiring may cost $200–$500, while ECM replacement and programming can run $800–$1,200.