Ignition / CombustionHigh ImpactPetrol

P0300 — Random/Multiple Cylinder Misfire Detected

The ECU has detected misfire events across multiple cylinders that exceed the acceptable threshold.

6+

Affected Brands

12+

ECU Platforms

3

Related Services

8

Related DTCs

Symptoms

What the driver typically experiences when P0300 is stored

!Check Engine Light (flashing if severe)
iEngine shaking / rough running
iLoss of power
iExhaust popping
!!Potential catalyst damage if prolonged

Why does P0300 appear after tuning?

Can occur with aggressive tuning parameters — particularly with pop & bang / crackle map features that intentionally retard ignition timing. Also seen with overboost conditions that exceed the fuel system capacity.

How proper calibration can address P0300

WEREMAP pop & bang calibrations use controlled ignition retard within safe limits. Performance tunes maintain proper fueling to prevent lean misfires under boost.

Related Tuning Services

Relevant services for the system behind P0300

Stage 1Stage 2DTC Off

Related Diagnostic Codes

Codes from the same diagnostic system as P0300

P0302High Impact

Diagnostic Trouble Code P0302

P0304High Impact

Diagnostic Trouble Code P0304

P0303High Impact

Diagnostic Trouble Code P0303

P0301High Impact

Diagnostic Trouble Code P0301

P0306High Impact

Diagnostic Trouble Code P0306

P0305High Impact

Diagnostic Trouble Code P0305

P0014Moderate Impact

Diagnostic Trouble Code P0014

P0017Moderate Impact

Diagnostic Trouble Code P0017

Affected ECU Platforms

Bosch MED17.7.2Delco E78Bosch MED9.1Bosch MG1CS002Bosch MG1CS015Bosch MG1CP002Bosch MED17.1.9Bosch MED17.1.9 MED17.9.9Bosch MED 17.7.7Bosch mg1cs002Siemens/Continental EMS24xxBosch MED17.4.2

Commonly Affected Vehicles

PorscheMacanBosch MG1CS002
FordF150Bosch MG1CS015
MBCLSBosch MG1CP002
Land RoverRange RoverBosch MED17.1.9
MBGLC / GLC Coup�Bosch MED 17.7.7
AudiS4Bosch mg1cs002
FordMustangSiemens/Continental EMS24xx
Peugeot308Bosch MED17.4.2

Based on data from 6+ vehicle brands. P0300 is not limited to these models.

Frequently Asked Questions

What does P0300 mean?â–¼
The ECU has detected misfire events across multiple cylinders that exceed the acceptable threshold.
Why does P0300 appear after ECU tuning?â–¼
Can occur with aggressive tuning parameters — particularly with pop & bang / crackle map features that intentionally retard ignition timing. Also seen with overboost conditions that exceed the fuel system capacity.
How do you prevent P0300 during remapping?â–¼
WEREMAP pop & bang calibrations use controlled ignition retard within safe limits. Performance tunes maintain proper fueling to prevent lean misfires under boost.
Which vehicles are affected by P0300?â–¼
P0300 is commonly found on Porsche, Ford, MB, Land Rover, Audi, Peugeot vehicles equipped with Bosch MED17.7.2, Delco E78, Bosch MED9.1, Bosch MG1CS002 ECU platforms.
What other codes appear alongside P0300?â–¼
P0300 frequently appears together with P0302, P0304, P0303, P0301, P0306. These related codes typically originate from the same system modification and should be addressed together in the calibration.

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