Ignition / MisfireHigh ImpactPetrol

P0340 — Diagnostic Trouble Code P0340

OBD-II diagnostic code P0340 relates to the ignition / misfire system. This code is logged when the ECU detects a parameter outside its expected operating range.

7+

Affected Brands

9+

ECU Platforms

1

Related Services

0

Related DTCs

Symptoms

What the driver typically experiences when P0340 is stored

!Check Engine Light (may flash)
iEngine misfires
iRough idle
iLoss of power

Why does P0340 appear after tuning?

This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.

How proper calibration can address P0340

WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.

Related Tuning Services

Relevant services for the system behind P0340

Stage 1

Affected ECU Platforms

Bosch MED17.2.2Denso SH72543Denso DENSOSiemens/Continental TC1796Siemens/Continental SIM271Siemens/Continental SIM271DE2.0Delco E37Delco Multec MT35ESagem S3000

Commonly Affected Vehicles

FordFusionBosch MED17.2.2
MitsubishiL200Denso SH72543
FordC-MaxBosch MED17.2.2
SuzukiSwiftDenso DENSO
MBE / E CoupeSiemens/Continental TC1796
ChevroletCaptivaDelco E37
OpelAstraDelco Multec MT35E
RenaultModusSagem S3000

Based on data from 7+ vehicle brands. P0340 is not limited to these models.

Frequently Asked Questions

What does P0340 mean?â–¼
OBD-II diagnostic code P0340 relates to the ignition / misfire system. This code is logged when the ECU detects a parameter outside its expected operating range.
Why does P0340 appear after ECU tuning?â–¼
This code may appear after ECU modifications when the affected system monitoring has not been fully recalibrated for the new operating parameters.
How do you prevent P0340 during remapping?â–¼
WEREMAP professional calibrations include comprehensive diagnostic management for all affected systems, preventing unnecessary fault codes while maintaining safe operation.
Which vehicles are affected by P0340?â–¼
P0340 is commonly found on Ford, Mitsubishi, Suzuki, MB, Chevrolet, Opel vehicles equipped with Bosch MED17.2.2, Denso SH72543, Denso DENSO, Siemens/Continental TC1796 ECU platforms.

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