The combination of these terms is unusual but can be found in several niche communities:
When searching for "GSM LS1 AK LS2 LS3", the internet algorithm often confuses three different "AK" products. Let's untangle that.
Car enthusiasts swapping LS1/LS2/LS3 engines into older vehicles often install GSM-based tracking systems (e.g., using a SIM800 module) to monitor engine parameters, GPS location, and send alerts via SMS. Online forum posts or project tags might list all these keywords for searchability. gsm ls1 ak ls2 ls3
Some vendors use "AK" as shorthand. Example: "LS1 AK LS2" means "LS1 also known as LS2" – which is technically wrong, but happens in mislabeled eBay listings.
Diagnosis: This is a phantom part. When searching "GSM LS1 AK LS2 LS3" on Google, many results are typos for "A/C bracket." Solution: If you need to mount your air conditioning compressor to an LS2 with a GSM transmission, buy the ICT Billet bracket, not an "AK" bracket. The AK term is largely a search engine oddity caused by Amazon listing concatenation. The combination of these terms is unusual but
| Wire on GSM Alarm | LS1 (1998-2002 PCM) | LS2 (E40) | LS3 (E38/E67) | |-------------------|---------------------|-----------|----------------| | 12V Constant | Under-hood jump block | Same | Same | | Ignition In | Pink wire at ignition switch | Same | Same | | Starter Kill (NC relay) | Cut purple wire at starter solenoid | Purple at crank relay | Use relay to interrupt "start request" from key to BCM | | Fuel Pump Kill | Grey wire (pin 9, red connector) | Dark green/white (pin 15, green connector) | Dark green/white (pin 21, x1 connector) | | Tach Input | White wire (pin 10, red connector - LS1) | Blue/white (pin 10, green connector) | Needs CAN-to-analog converter |
GSM is being phased out globally in favor of 3G, 4G LTE, and 5G, but remains in use for M2M (machine-to-machine) communications, remote monitoring, and legacy systems. It is also the basis for many vehicle telematics and security systems — a point relevant to the LS engines below. | Wire on GSM Alarm | LS1 (1998-2002
A standalone company, AK Automotive, makes microcontrollers specifically for 6L80E transmissions. If you are swapping an LS3 (Gen IV) with a 6-speed, you might need an AK TCM to talk to your GSM wiring harness.
Summary Table:
| Engine | Reluctor | Best GSM Trans | Required "AK" Controller | | :--- | :--- | :--- | :--- | | LS1 | 24x | GSM 4L60E | AK-24x Harness | | LS2 | 24x | GSM 4L80E | AK-24x + Flexplate spacer | | LS3 | 58x | GSM 6L80E | AK-58x Harness + AK TCM |
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