Restore Your Vehicle’s Performance and Reliability
Is your 2008 Cadillac CTS or other GM vehicle suffering from frustrating issues like a persistent Check Engine Light, rough idling, stalling, or a complete no-start condition? These are classic signs of a failing Engine Control Module (ECM), the central computer that manages your engine’s most critical functions. A faulty ECM can disrupt everything from fuel economy to transmission shifting, making your vehicle unreliable and unsafe. This isn’t just an inconvenience; it’s a problem that needs a dependable solution.
This listing is for a fully tested Engine Control Module, part number 12612384, which serves as a direct-fit replacement for a wide range of GM cars, trucks, and SUVs. The biggest challenge with replacing an ECM has always been the expensive and time-consuming programming required. We eliminate that headache. Before we ship your module, our experts will flash it with the latest GM-certified software, precisely matched to your vehicle using the VIN you provide. This means you receive a part that is truly plug-and-play, saving you a trip to the dealership and hundreds of dollars in programming fees.
Case Study: A Tricky Diagnosis
I remember a 2008 Sierra 1500 that came into my shop with a problem that was driving the owner crazy. It would run perfectly for days, then suddenly stall at a stoplight with no warning. No consistent codes were stored, just an occasional U0100 (Lost Communication with ECM/PCM). We checked grounds, wiring, and power feeds—all solid. On a hunch, we monitored the ECM’s internal temperature data. We found that after about 30 minutes of driving, the processor temperature would spike just before it would shut down. It was a classic case of internal heat failure in the module. We installed one of our VIN-programmed ECMs, and the truck has been running without a single issue for over two years. Sometimes, the symptoms are intermittent, but the root cause is a failing computer.
Common Signs of a Failing GM ECM
If you’re experiencing any of the following, a faulty 2008 CTS Engine Control Module could be the culprit. Proper diagnosis is always recommended, but these are strong indicators:
- âś” Check Engine Light is on with codes like P0601, P0602, P0606, or U-series communication codes.
- âś” Engine cranks but refuses to start.
- âś” Noticeable drop in fuel efficiency.
- âś” Rough or unpredictable engine idling.
- âś” Vehicle stalls unexpectedly while driving or at idle.
- âś” Hesitation or stumbling during acceleration.
- âś” Automatic transmission shifts harshly or at the wrong times.
- âś” “Reduced Engine Power” message displayed on the dash.
A Straightforward Guide to Installation
Installing your pre-programmed module is a job most DIYers can handle in under an hour. While specific locations vary by model, the general process is the same.
- Safety First: Disconnect the negative terminal from your vehicle’s battery and secure it away from the post to prevent accidental contact.
- Locate the ECM: On a 2008 Cadillac CTS, the ECM is found in the right-front of the engine compartment. For trucks and SUVs like the Sierra or Tahoe, it’s typically under the hood on the driver’s side, near the battery.
- Disconnect and Remove: Carefully unplug the wiring harness connectors from the old module. They have locking tabs that need to be released. Once disconnected, unbolt the module from its mounting bracket.
- Install the New Module: Bolt your new, pre-programmed ECM into place. Firmly reconnect the wiring harnesses, ensuring they click and lock securely.
- Reconnect Power: Re-attach the negative battery terminal.
- Perform Security Relearn: Your vehicle’s anti-theft system may need to be synchronized with the new ECM. This is a simple procedure (often called a ‘key-on/key-off’ relearn) that typically takes 10-30 minutes and requires no special tools. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for part numbers 12612384, 12622141, and 12617568. It is confirmed to fit the following vehicles with the specified options. Please match your part number or vehicle to ensure compatibility.
SIERRA 2500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
SUBURBAN 1500 08 Electronic Control Module; (LH front under battery)
AVALANCHE 1500 08 Electronic Control Module; (LH front under battery)
SUBURBAN 2500 08 Electronic Control Module; (LH front under battery)
TORRENT 08-09 Electronic Control Module; (LH engine compartment), 3.4L
VUE 08-09 Electronic Control Module; 3.5L
AURA 08 Electronic Control Module; (RH firewall), 3.5L
SIERRA 3500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
CTS 08 Electronic Control Module; (RH front engine compartment), (3.6L), VIN 7 (8th digit), ID 12612384
CAPRICE 11 Electronic Control Module; ID 12612384
SIERRA DENALI 08 Electronic Control Module; (LH front engine compartment)
ESCALADE EXT 08 Electronic Control Module; (LH front under battery)
EXPRESS 3500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
G6 08 Electronic Control Module; (LH front engine compartment), 3.5L
HUMMER H2 08 Electronic Control Module; (LH front under battery)
EXPRESS 1500 VAN 08 Electronic Control Module; (LH rear engine compartment), 5.3L
MALIBU 08 Electronic Control Module; classic style (emblem in grille), 3.5L
SAVANA 1500 VAN 08 Electronic Control Module; (LH rear engine compartment), 5.3L
CORVETTE 08 Electronic Control Module; (RH engine compartment)
CORVETTE 09 Electronic Control Module; (RH engine compartment), Z06
IMPALA 08 Electronic Control Module; (lower part of air cleaner box), 3.9L
SILVERADO 1500 PICKUP 08 Electronic Control Module; (LH front under battery), w/o 4.3L
YUKON 08 Electronic Control Module; (LH front under battery), w/o hybrid option
EXPRESS 2500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
SILVERADO 2500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
YUKON XL 2500 08 Electronic Control Module; (LH front under battery)
SILVERADO 3500 PICKUP 08 Electronic Control Module; (LH front under battery), 6.0L
G6 08 Electronic Control Module; (LH front engine compartment), 3.9L
SAVANA 3500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
SIERRA 1500 PICKUP 08 Electronic Control Module; (LH front under battery), w/o 4.3L
TAHOE 08 Electronic Control Module; (LH front under battery), w/o hybrid option
MALIBU 08 Electronic Control Module; new style (emblem in bumper cover), 3.5L
SAVANA 2500 VAN 08 Electronic Control Module; (LH rear engine compartment), gasoline
ESCALADE ESV 08 Electronic Control Module; (LH front under battery)
ESCALADE 08 Electronic Control Module; (LH front under battery)
IMPALA 08 Electronic Control Module; (lower part of air cleaner box), 3.5L
YUKON XL 1500 08 Electronic Control Module; (LH front under battery)
What do I need to do after I purchase this module?
What do I need to do after I purchase this module?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add the VIN as a note during checkout or send it to us in a message referencing your order number.
Is any additional programming required after installation?
What do I need to do after I purchase this module?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add the VIN as a note during checkout or send it to us in a message referencing your order number.
How do I find my current ECM’s part number?
What do I need to do after I purchase this module?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add the VIN as a note during checkout or send it to us in a message referencing your order number.
Will this fix my car’s problem for sure?
What do I need to do after I purchase this module?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add the VIN as a note during checkout or send it to us in a message referencing your order number.
Where is the ECM located on my 2008 Cadillac CTS?
What do I need to do after I purchase this module?
After you complete your purchase, you must send us your vehicle’s 17-digit VIN (Vehicle Identification Number). We cannot program and ship your module without it. You can typically add the VIN as a note during checkout or send it to us in a message referencing your order number.