OBD-II Code P1300 — What It Means & How to Fix It

What Does This Error Mean?

P1300 is a Toyota and Lexus-specific code indicating a fault in Igniter Circuit No. 1. Toyota uses individual igniter modules for each ignition coil. When the PCM does not receive the igniter confirmation signal (IGF signal) from the No. 1 igniter, P1300 is set. This typically causes a misfire in cylinder 1 and a rough-running engine. The check engine light will flash during heavy misfires.

Affected Models

Common in Toyota Camry with 4-cylinder and V6 engines
Common in Toyota Corolla with 1.8L engine
Common in Toyota Tacoma and 4Runner
Common in Lexus ES300 and IS300 with Toyota engines

Common Causes

Faulty ignition igniter or ignition coil for cylinder No. 1
Damaged spark plug causing excessive load on the ignition coil
Broken or corroded wiring in the IGF signal circuit
Failed PCM ignition control circuit for cylinder No. 1
Carbon-tracked distributor cap on older vehicles with distributor ignition

How to Fix It

Connect a scan tool and check for any companion misfire codes such as P0301 (Cylinder 1 Misfire). This confirms which cylinder is affected.

P1300 may appear alongside P0300 (random misfire) or P0301 (Cylinder 1 misfire) on Toyota vehicles.
Remove and inspect the spark plug for cylinder 1. Check for fouling, cracks, or incorrect gap.

A damaged spark plug can cause the ignition coil to work harder and eventually trigger an igniter fault.
Inspect the ignition coil or igniter unit for cylinder 1. Look for cracks, carbon tracking, or signs of arcing on the coil body.

On Toyota COP (coil-on-plug) systems, swap the coil from cylinder 1 with another cylinder to see if the fault moves.
Check the IGF signal wire from the igniter to the PCM for continuity, shorts, or damage.

The IGF signal is a feedback signal the igniter sends to the PCM confirming a spark event occurred.
Replace the faulty ignition coil or igniter after confirming it is the source of the fault.

After replacement, clear codes and test drive. Confirm no misfire codes or P1300 return.

When to Call a Professional

Ignition coil or igniter replacement is $50 to $150 per coil on most Toyotas. Spark plug replacement is $80 to $200 for a full set. Wiring harness repair is $100 to $300 depending on damage. A Toyota dealer or specialist can confirm the fault cylinder with specific diagnostic tools.

Frequently Asked Questions

What is the IGF signal on a Toyota?

IGF stands for Ignition Confirmation signal. It is a signal sent from each igniter back to the PCM to confirm that a spark event actually occurred. If the PCM does not receive this signal, it knows a particular ignition circuit has failed and sets a code.

Can I drive with P1300 on my Toyota?

Short distances only, with care. A cylinder 1 misfire puts unburned fuel into the exhaust, which can damage the catalytic converter over time. If the check engine light is flashing, stop driving and have it repaired as soon as possible.

Is P1300 the same as a cylinder 1 misfire code?

They are related but not the same. P0301 confirms a misfire in cylinder 1 based on crankshaft speed variations. P1300 is specific to the igniter circuit feedback signal. Both may appear together, but P1300 can appear without P0301 in some cases.