MechanicDB
Fault Family System: Powertrain (P-Codes) 87 SAE Codes

Ignition Coil Control Circuit

Diagnostic & Technical Explanation
Code P030A (Ignition A Control Signal Circuit/Open) sets when the ECM (or, on coil-on-plug systems with many cylinders, a dedicated ignition driver) detects an open circuit or out-of-range voltage while commanding a specific coil's primary winding, covering both the classic per-letter Ignition Coil Primary Control Circuit/Open codes and the newer Ignition [Letter] Control Signal Circuit Open/Low/High variants used on high-cylinder-count and coil-per-plug platforms. In every variant the physical fault sits in the same place: a failed coil primary winding, a corroded or unseated coil connector, or chafed wiring between the ECM/driver and that specific coil.

These 87 diagnostic trouble codes share one detection mechanism and one repair path, which is why MechanicDB groups them into a single authored fault family rather than repeating the same explanation 87 times.

Codes in this family (87)

CodeDefinitionRepair coverage
P030AIgnition A Control Signal Circuit/Open4 ranked fixes
P030BIgnition A Control Signal Circuit Low4 ranked fixes
P030CIgnition A Control Signal Circuit High4 ranked fixes
P030DIgnition B Control Signal Circuit/Open4 ranked fixes
P030EIgnition B Control Signal Circuit Low4 ranked fixes
P030FIgnition B Control Signal Circuit High4 ranked fixes
P031AIgnition C Control Signal Circuit/Open4 ranked fixes
P031BIgnition C Control Signal Circuit Low4 ranked fixes
P031CIgnition C Control Signal Circuit High4 ranked fixes
P031DIgnition D Control Signal Circuit/Open4 ranked fixes
P031EIgnition D Control Signal Circuit Low4 ranked fixes
P031FIgnition D Control Signal Circuit High4 ranked fixes
P0350Ignition Coil Primary/Secondary Circuit/Open4 ranked fixes
P0351Ignition Coil A Primary Control Circuit/Open4 ranked fixes
P0352Ignition Coil B Primary Control Circuit/Open4 ranked fixes
P0353Ignition Coil C Primary Control Circuit/Open4 ranked fixes
P0354Ignition Coil D Primary Control Circuit/Open4 ranked fixes
P0355Ignition Coil E Primary Control Circuit/Open4 ranked fixes
P0356Ignition Coil F Primary Control Circuit/Open4 ranked fixes
P0357Ignition Coil G Primary Control Circuit/Open4 ranked fixes
P0358Ignition Coil H Primary Control Circuit/Open4 ranked fixes
P0359Ignition Coil I Primary Control Circuit/Open4 ranked fixes
P035AIgnition E Control Signal Circuit/Open4 ranked fixes
P035BIgnition E Control Signal Circuit Low4 ranked fixes
P035CIgnition E Control Signal Circuit High4 ranked fixes
P035DIgnition F Control Signal Circuit/Open4 ranked fixes
P035EIgnition F Control Signal Circuit Low4 ranked fixes
P035FIgnition F Control Signal Circuit High4 ranked fixes
P0360Ignition Coil J Primary Control Circuit/Open4 ranked fixes
P0361Ignition Coil K Primary Control Circuit/Open4 ranked fixes
P0362Ignition Coil L Primary Control Circuit/Open4 ranked fixes
P036AIgnition G Control Signal Circuit/Open4 ranked fixes
P036BIgnition G Control Signal Circuit Low4 ranked fixes
P036CIgnition G Control Signal Circuit High4 ranked fixes
P036DIgnition H Control Signal Circuit/Open4 ranked fixes
P036EIgnition H Control Signal Circuit Low4 ranked fixes
P036FIgnition H Control Signal Circuit High4 ranked fixes
P038AIgnition I Control Signal Circuit/Open4 ranked fixes
P038BIgnition I Control Signal Circuit Low4 ranked fixes
P038CIgnition I Control Signal Circuit High4 ranked fixes
P038DIgnition J Control Signal Circuit/Open4 ranked fixes
P038EIgnition J Control Signal Circuit Low4 ranked fixes
P038FIgnition J Control Signal Circuit High4 ranked fixes
P03FAIgnition K Control Signal Circuit/Open4 ranked fixes
P03FBIgnition K Control Signal Circuit Low4 ranked fixes
P03FCIgnition K Control Signal Circuit High4 ranked fixes
P03FDIgnition L Control Signal Circuit/Open4 ranked fixes
P03FEIgnition L Control Signal Circuit Low4 ranked fixes
P03FFIgnition L Control Signal Circuit High4 ranked fixes
P2300Ignition Coil A Primary Control Circuit Low4 ranked fixes
P2301Ignition Coil A Primary Control Circuit High4 ranked fixes
P2302Ignition Coil A Secondary Circuit4 ranked fixes
P2303Ignition Coil B Primary Control Circuit Low4 ranked fixes
P2304Ignition Coil B Primary Control Circuit High4 ranked fixes
P2305Ignition Coil B Secondary Circuit4 ranked fixes
P2306Ignition Coil C Primary Control Circuit Low4 ranked fixes
P2307Ignition Coil C Primary Control Circuit High4 ranked fixes
P2308Ignition Coil C Secondary Circuit4 ranked fixes
P2309Ignition Coil D Primary Control Circuit Low4 ranked fixes
P2310Ignition Coil D Primary Control Circuit High4 ranked fixes
P2311Ignition Coil D Secondary Circuit4 ranked fixes
P2312Ignition Coil E Primary Control Circuit Low4 ranked fixes
P2313Ignition Coil E Primary Control Circuit High4 ranked fixes
P2314Ignition Coil E Secondary Circuit4 ranked fixes
P2315Ignition Coil F Primary Control Circuit Low4 ranked fixes
P2316Ignition Coil F Primary Control Circuit High4 ranked fixes
P2317Ignition Coil F Secondary Circuit4 ranked fixes
P2318Ignition Coil G Primary Control Circuit Low4 ranked fixes
P2319Ignition Coil G Primary Control Circuit High4 ranked fixes
P2320Ignition Coil G Secondary Circuit4 ranked fixes
P2321Ignition Coil H Primary Control Circuit Low4 ranked fixes
P2322Ignition Coil H Primary Control Circuit High4 ranked fixes
P2323Ignition Coil H Secondary Circuit4 ranked fixes
P2324Ignition Coil I Primary Control Circuit Low4 ranked fixes
P2325Ignition Coil I Primary Control Circuit High4 ranked fixes
P2326Ignition Coil I Secondary Circuit4 ranked fixes
P2327Ignition Coil J Primary Control Circuit Low4 ranked fixes
P2328Ignition Coil J Primary Control Circuit High4 ranked fixes
P2329Ignition Coil J Secondary Circuit4 ranked fixes
P2330Ignition Coil K Primary Control Circuit Low4 ranked fixes
P2331Ignition Coil K Primary Control Circuit High4 ranked fixes
P2332Ignition Coil K Secondary Circuit4 ranked fixes
P2333Ignition Coil L Primary Control Circuit Low4 ranked fixes
P2334Ignition Coil L Primary Control Circuit High4 ranked fixes
P2335Ignition Coil L Secondary Circuit4 ranked fixes
P2C30Ignition Coil Primary Circuit Fuse A4 ranked fixes
P2C31Ignition Coil Primary Circuit Fuse B4 ranked fixes

What this page does not show

This page publishes the fault mechanism and the code index. The licensed dataset adds, for every one of the 15,886 codes, the full authored repair set (56,729 procedures in total) with the fields deliberately withheld here: