Glow Plug Control Unit – BMW Diesel (12218591723) Replacement

The glow plug control unit (OEM 12218591723) is a critical diesel engine component that regulates the electrical current and timing delivered to the glow plugs on BMW diesel vehicles, ensuring effective pre-heating of combustion chambers for reliable cold starts and smoother ignition. This unit replaces the original control module and is engineered to meet OEM standards for fit and function. Commonly referenced interchangeably with part numbers 12217798000 / 12 21 7 798 000 / 12 21 8 591 723, the 12218591723 glow plug control unit is used across a wide range of BMW models including 1 Series, 3 Series, 5 Series, X1 and X3 diesel-powered vehicles, helping improve start-up performance and reduce glow plug-related warning lights.

OEM Number: 12217788956, 12217801202, 12427789231, 12218591723

Voltage : 12V

Number of Cylinders : 6

Number of Pins : 13 -Pin Connector

Quantity : 1

Our SKU: TB12218591723_94

All our Glow Plug Control Unit Fits BMW Diesel 12218591723 are OEM quality and reliable after market car parts. This Glow Plug Control Unit Fits BMW Diesel 12218591723 is specifically compatible with BMW: 1 Series, 3 Series, 5 Series, 6 Series, 7 Series, X1, X3, X5, X6, .

Please use our make-model-year tool to check this part's compatibility with your vehicle. However, please note that our tool is for reference only and we recommend that you check the part number on your old unit prior to purchasing.

If you are still not sure about the compatibility of this part to your vehicle, please supply us with the VIN number or Reg number in our live chat or contact form! You can also find details on our purchasing & shipping guide here.

Key Benefits

Restores Reliable Cold-Start Performance
By managing the glow plugs’ current and activation timing based on engine ECU inputs, this control unit promotes smoother starting in colder conditions and reduces extended crank times.

Direct OEM Replacement (12218591723)
Manufactured as an equivalent replacement for the original BMW part 12218591723 and compatible cross-reference numbers, this control unit installs directly into the glow plug system without modification.

Supports Efficient Combustion and Warm-Up
Accurate glow plug operation helps ensure complete combustion when the engine starts, which can improve early fuel economy and reduce white smoke emissions associated with incomplete ignition.

Broad Vehicle Compatibility
This control unit fits multiple BMW diesel models — including 1 Series (E81/E87), 3 Series (E90/E91/E92/E93), 5 Series (E60/E61), X1 (E84) and X3 (E83) — that use part numbers equivalent to 12218591723.

Improves Engine Management Reliability
Replacing a worn or faulty glow plug control unit can help clear glow-plug-related fault codes, restore correct system operation, and reduce risk of starter motor strain or unnecessary diagnostics.

Frequently Asked Questions (FAQs)

Q: What does the glow plug control unit do?
A glow plug control unit monitors engine conditions and regulates the electrical current and duration delivered to the glow plugs before and during engine start-up, ensuring the diesel combustion chambers are pre-heated to promote smooth ignition.

Q: What are common symptoms of a failing control unit?
Typical signs include difficulty starting the engine in cooler weather, extended crank times, a glow plug or engine warning light on the dashboard, increased white exhaust smoke at start-up, and rough idle immediately after ignition.

Q: Which BMW models use part number 12218591723?
This glow plug control unit fits a range of BMW diesel-powered vehicles that require OEM reference 12218591723 or equivalent numbers such as 12217798000. It’s commonly used on 1 Series, 3 Series, 5 Series, X1 and X3 models — always verify fitment using your vehicle’s VIN or existing part number.

Q: Is this unit a direct replacement for the original?
Yes. When matched with the correct OEM reference, this glow plug control unit installs as a direct replacement for the original component and restores pre-heating system functionality.

Q: Do I need professional installation?
Although some experienced technicians may replace the unit themselves, professional installation is recommended to ensure proper electrical connection, system calibration and avoid diagnostic issues.