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DTC codes / Volkswagen codes / P1300

P1300 · VolkswagenMisfire Detected Fuel Level Too Low

P1300 on Volkswagen vehicles indicates the engine control module has detected a misfire condition that it correlates with an excessively low fuel level in the tank. The computer monitors crankshaft speed fluctuations and fuel level input, and when misfire events occur while the fuel level is below a calibrated threshold, it stores this code to flag that the misfire may be caused by fuel starvation rather than a faulty ignition or injection component.

SystemPowertrain
Code typeVolkswagen specific
SeverityMedium
Fix difficultyIntermediate
AreaIgnition system and misfire

Symptoms you may notice

  • Illuminated check engine light, often accompanied by a flashing light if the misfire is severe
  • Engine hesitation or stumbling during acceleration, especially when the fuel gauge is low
  • Rough idle or noticeable vibration felt through the steering wheel and seats
  • Loss of power or reduced engine performance on inclines or under load
  • Occasionally no symptoms besides the warning light, particularly if the misfire is intermittent
  • Fuel gauge reading at or near empty when the fault occurs

Common causes, most likely first

  1. Fuel level genuinely too low, causing the fuel pump to draw air and lean out the mixture
  2. Faulty fuel level sending unit providing an incorrect low reading to the engine control module
  3. Weak or failing fuel pump that cannot maintain pressure when the tank is low
  4. Clogged fuel filter restricting flow under low-fuel conditions
  5. Wiring or connector issue at the fuel level sensor or fuel pump assembly
  6. Engine control module software calibration that is overly sensitive to low-fuel misfire events
  7. Contaminated fuel or water in the fuel tank causing poor combustion when the level is low

How to diagnose and fix it

  1. Verify the fuel level with a manual gauge or by adding a known quantity of fuel and clearing the code to see if it returns
  2. Inspect the fuel level sending unit wiring and connector for corrosion, looseness, or damage
  3. Test fuel pump pressure and volume according to Volkswagen specifications, especially with a low tank
  4. Replace the fuel filter if service history is unknown or if flow is restricted
  5. Check for technical service bulletins or engine control module software updates related to this code
  6. Perform a fuel quality check and inspect for water or contamination in the tank
  7. If all else fails, diagnose the misfire itself with ignition and injection tests to rule out secondary causes

Low fuel misfire codes are often misdiagnosed

  • Many technicians replace ignition coils or spark plugs when the real issue is simply that the driver habitually runs the tank near empty, causing the pump to cavitate and lean out the mixture.
  • A failing fuel level sender can report empty to the engine control module even when the tank is half full, triggering P1300 without any actual fuel shortage.
  • Volkswagen's misfire detection is sensitive to crankshaft speed variations, and a low fuel level can cause momentary lean spikes that are logged as misfires even if the driver feels nothing.
  • This code does not always mean the fuel pump is failing; a restricted fuel filter or a pinched fuel line can create the same low-fuel pressure condition.
  • After refueling and clearing the code, some Volkswagens require a short drive cycle for the fuel level adaptation to reset and for the misfire monitor to run again.

Can I keep driving with P1300?

You can drive the vehicle to a fuel station or workshop if the misfire is mild and the fuel level is low, but avoid hard acceleration and sustained high-speed driving until the tank is filled and the code is cleared. If the check engine light is flashing or the engine runs very poorly, stop driving and have the vehicle towed to prevent catalytic converter damage.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for Volkswagen vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

Running on fumes Free guides aren't free to make. Top up the tank. Any amount, one time. Fuel the Garage