M47 Glow Plug Control Module Restoration
(18d / 20d – 85 kW, 90 kW, 110 kW, 120 kW)
In M47 engines, a common cold-start issue is the failure of the glow plug control module.
Factory-installed modules (OE codes 12217786821, 12217801200, 7786821, 7801200, GSE101) may, over time, lose the ability to power one or several glow plugs or stop activating the glow plug system entirely.
The restoration and structural improvement of the module eliminates the original design weaknesses, restores proper glow plug operation, and significantly extends system lifespan.
The refurbished module operates reliably in both pre-heating and after-heating modes.
DTC fault codes commonly indicating module failure
4212 – Glow plug, cylinder 1
4222 – Glow plug, cylinder 2
4232 – Glow plug, cylinder 3
4242 – Glow plug, cylinder 4
4203 – Glow plug control unit: no communication
Recommendation
When replacing the module, it is recommended to replace the power supply cable for the glow plug control unit as well.
Even if no visible damage is present, poor contact may cause overheating and result in module failure.
Information
When purchasing a refurbished module with the option to return the old unit, a €30 deposit is applied.
After receiving the refurbished module, the customer must return their old unit within 14 calendar days.
Requirements for the returned module
The module must be clean (no oil, no dirt).
The module must be original BMW or BERU.
It must not be disassembled, opened, soldered, or previously repaired.
A copy of the order / invoice must be included.
The customer covers return shipping costs.
Inspection and deposit refund
Once the old module is received, it is inspected within 1–3 business days.
If the module meets the requirements, the €30 deposit is refunded.
If the module does not meet the requirements, the deposit is not refunded. Upon request, the module can be returned to the customer, who covers the return shipping costs.
Suitable for these models:
