Skip to content
GTECH Calibration
Portal

P1300

Ignitor Circuit.

  • Buick
  • Powertrain
  • Manufacturer code
  • Medium severity

How this code is built

P
SystemPowertrain
1
Defined byThe manufacturer
3
AreaIgnition system or misfire
00
FaultThe specific fault in that area

What it means

P1300 on a Buick means the engine control module has detected a fault in the ignitor circuit, which is the part of the ignition system that switches the coil primary current and controls spark timing. The module saw the ignition control or reference signal outside the expected range, or the ignition feedback missing, so it stored the code. The exact circuit layout depends on the model and engine, so check the correct wiring diagram for the vehicle.

Symptoms

  • Engine misfiring or running roughly
  • Hesitation or loss of power under acceleration
  • Hard starting or a no-start
  • Engine stalling at idle or when coming to a stop
  • Check engine light on
  • Poor fuel economy

Possible causes

  • Faulty ignition module or ignitor (the unit that switches the coil)likely
  • Wiring damage, chafing or poor connection in the ignition control or reference circuitslikely
  • Failed ignition coil or coil pack drawing abnormal currentpossible
  • Faulty crankshaft or camshaft position sensor giving a bad reference signalpossible
  • Poor power or earth supply to the ignition modulepossible
  • Fault inside the engine control modulerare

How to diagnose

  1. Read all stored codes and freeze frame data, noting engine speed, temperature and load when the fault set, and check for related misfire or crank sensor codes
  2. Visually inspect the ignition module, coil and related wiring and connectors for heat damage, corrosion, chafing or loose pins
  3. Check the battery condition and charging voltage, as low voltage can upset ignition signals
  4. Test the power and earth supplies at the ignition module against the wiring diagram
  5. Check the crankshaft and camshaft position sensor signals and their wiring for the correct pattern
  6. Test the ignition coil resistance against the manufacturer specification for that engine
  7. Check the ignition control and reference circuits between the module and the engine control module for continuity, shorts and unwanted voltage
  8. Check the signal from the module to the engine control module with a scope if the other tests pass

How to fix

  • Replace the ignition module or ignitor if it fails testing
  • Repair or replace damaged wiring and clean or renew corroded connectors
  • Replace the faulty ignition coil or coil pack
  • Replace the faulty crankshaft or camshaft position sensor
  • Restore a good power or earth supply to the ignition module
  • Only after all else is proven, replace or repair the engine control module

Can I keep driving?

Medium severity

The car may drive, but a faulty ignition circuit can cause misfires, stalling and possible catalytic converter damage, so get it fixed soon. Avoid long journeys or heavy loads, and stop driving if the engine is misfiring badly or the warning light flashes.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.

This code for other makes

Nearby codes