29D4
Moderate29D4 — Engine Management Fault Code
Description
What Code 29D4 Means
Code 29D4 belongs to the BMW engine management fault group and points to misfires (Fehlzündungen) or cylinder drop-out (Zylinderaussetzer). In the source data the code was pulled with a Delphi scan tool together with code 29CC. The original message gives no clear assignment to a specific cylinder, though the discussion mentions a fault on cylinder 8.
The DME (Digital Motor Electronics) logs misfires when it detects uneven crankshaft rotation. The cause may lie in the ignition system, fuel delivery, the mechanical side of the timing drive, or Valvetronic. Here the injector check apparently turned up no fault, and the suspected Valvetronic fault is still unconfirmed because that check hasn't been done yet.
Symptoms
Symptoms
- Misfires (Fehlzündungen) and cylinder drop-out (Zylinderaussetzer) logged by the DME.
- The discussion mentions a fault on cylinder 8.
- The source data does not tie the symptoms specifically to code 29D4.
Causes and fixes
Diagnosis and Repair
The source data has no confirmed fix for code 29D4. The following steps and assumptions are listed:
- Injector check — apparently not the cause of the fault.
- Re-read the codes with BMW software.
- Suspected Valvetronic fault; the Valvetronic check hasn't been done yet.