P1300: Igniter Circuit No. 1 (Toyota, Lexus); Boost Calibration Fault (Ford)
Quick Answer
Not safe to drive
P1300 is a manufacturer-specific code. Toyota and Lexus define it as igniter circuit No. 1: the engine computer sends an ignition timing signal (IGT) and does not get the confirmation signal (IGF) back from the igniter. Ford lists it as a boost calibration fault, a turbo boost pressure fault that is usually traced to the boost pressure sensor or its wiring, and Honda, Audi and Volkswagen list it as a random misfire. The repair steps below cover the Toyota and Lexus meaning only. It is not the same as P0300, which is a random misfire code on every make.
- Severity
- High · Ignition
- Estimated repair cost
- From €60 to €1800+, varies by vehicle
€60 or €1800, depending on your car.
- Diagnose the IGT and IGF circuit with a scope or meter€60–€130
- Engine computer repair or replacement (rare)€500–€1800
A scan shows whether P1300 is really stored on your car, which codes sit next to it and how urgent each one is. You can do this parked, with the ignition on.
A scan needs a Bluetooth OBD2 adapter (Bluetooth LE on iPhone), about €25-60; the built-in demo runs without one. See which adapter to buy
What does P1300 mean?
P1300 is a ignition-related diagnostic trouble code classified as high severity.
What are the symptoms of P1300?
- Check engine light on
- Engine stalls or will not restart
- Cranks but does not start
- Misfire, rough running or hesitation
- Loss of power
- Code returns right after clearing
- Codes for other igniter circuits stored with it
What causes P1300?
Poor or missing ground at the coil or igniter, or a voltage drop on its power supply
: high
Damaged, frayed or loose wiring and connectors in the IGT or IGF circuit
: high
Failed igniter or ignition coil assembly
: medium
Faulty crankshaft or camshaft position sensor, so the igniter never gets its trigger
: medium
Engine computer output stage fault (rare)
: low
Wiring disturbed by recent engine work, for example an intake or valve cover job
: medium
Is it safe to drive with P1300?
No - address this immediately. Do not rely on the car. On the Toyota and Lexus system, the engine computer expects a confirmation signal from the igniter after every spark command, and without it the engine can stall, refuse to restart or have fuel injection cut. If the car runs normally with a steady light, drive only as far as a workshop. Stop if it stalls, misfires or the light flashes.
How do you diagnose P1300?
- Confirm the car is a Toyota or Lexus. On a Ford the same number is a boost calibration fault, where the boost pressure sensor and its wiring are the first place to look, and parts bought for the wrong definition will not help
- Read all codes. P1300 is the number 1 igniter circuit, so look for codes for other igniter circuits stored with it: several together suggest a shared fault such as power or ground, one alone points at that coil and its wiring
- Inspect the coil and igniter connectors for broken wires, loose pins and corrosion, and look for harness damage near the valve cover or where the intake has been removed
- Check power and ground at the coil and igniter. Poor grounds and power-side problems are among the most common causes
- Check that the crankshaft position sensor is giving a signal, since the igniter gets no trigger without it
- Check the IGT trigger and IGF return signals with a scope or test light. A generic reader cannot show these signals, so this step needs a workshop or a proper tester
- Replace the igniter or coil only after wiring, power and ground are proven good, then clear the code and road test
How much does P1300 cost to fix?
| Repair | Parts Cost | Labor Cost | Total Estimate | DIY Difficulty |
|---|---|---|---|---|
| Diagnose the IGT and IGF circuit with a scope or meter | €0–€0 | €60–€130 | €60–€130 | Professional |
| Repair a damaged ground or igniter wiring | €10–€50 | €60–€180 | €70–€230 | Moderate |
| Replace igniter or ignition coil assembly | €30–€250 | €40–€150 | €70–€400 | Moderate |
| Replace crankshaft position sensor | €20–€100 | €50–€200 | €70–€300 | Moderate |
| Replace coil set and spark plugs | €120–€430 | €80–€250 | €200–€680 | Moderate |
| Engine computer repair or replacement (rare) | €400–€1500 | €100–€300 | €500–€1800 | Professional |
Prices estimated as of October 2026. Costs vary by region, vehicle, and shop.
P1300 on specific vehicles
P1300 on Toyota
Toyota Tacoma 2.7 (1996)
P1300 on Lexus
Lexus GS 300 3.0
Related diagnostic codes
Common questions about P1300
- Is P1300 the same as P0300?
- No. P0300 is the generic random misfire code and means the same on every make. P1300 is manufacturer-specific: an igniter circuit fault on Toyota and Lexus, a boost calibration fault on Ford, and a random misfire on Honda, Audi and Volkswagen.
- What does the IGT and IGF signal mean?
- IGT is the engine computer's ignition command to the igniter, and IGF is the igniter's confirmation that the ignition event happened. P1300 sets when the computer sees good crankshaft and camshaft signals and a good IGT but gets no IGF back.
- Why does the engine stall with P1300?
- Toyota's system treats a missing IGF as a reason to stop fuel injection as a fail-safe. The car can seem to have spark and still run out of fuel delivery, so stalling or a no-start is possible.
- Will changing the coil packs and spark plugs fix P1300?
- Not always. In one owner case on a 2000 Lexus GS 300, a used igniter did not cure it and a workshop found a frayed wire at the cylinder 6 coil connection. In a 1996 Tacoma case, the article's author suspected a voltage drop in the ignition circuit rather than a failed coil. Check wiring and grounds first.
- Can I drive with P1300?
- It is not recommended. The engine may stall at a bad moment, and a misfire sends unburnt fuel into the catalytic converter. If the car runs smoothly with a steady light, drive only to a workshop.
- Does P1300 mean the same on a Ford or a Honda?
- No. Ford lists P1300 as a boost calibration fault, Honda, Audi and Volkswagen as a random misfire, and Chrysler, Dodge and Mitsubishi as an ignition timing adjustment circuit. A Toyota fix does not apply to any of them, so check the definition for your own make.
Read our detailed guides
Sources
- motor.com motor.com/magazine-summary/driveability-corner-february-2007/
- tat.net.au tat.net.au/scandata/codes/code-view.php?id=5743
- 2carpros.com 2carpros.com/questions/p1300-igniter-circuit-malfunction--1645616