Restore Your Truck’s Performance and Reliability
Is your Silverado, Sierra, or other GM truck plagued by frustrating electrical gremlins? A failing Powertrain Control Module (PCM) is often the culprit behind issues that can leave you stranded. From a sudden no-start condition to erratic engine behavior, a faulty PCM can make your reliable workhorse feel unpredictable. This replacement PCM, part number 12602802, is the definitive solution to restore your vehicle’s core functions. We take the guesswork and high costs out of the repair by programming the module specifically to your vehicle’s VIN before it ships. This ensures it communicates perfectly with your truck’s systems right out of the box, getting you back on the road with confidence.
A Technician’s Notebook
I remember a 2006 Silverado 2500HD with the 6.0L that came into my bay on a tow truck. The owner was at his wit’s end. He’d replaced the battery and alternator, but the truck would still randomly die and refuse to restart for hours. His scanner showed a slew of communication loss codes (U-codes) along with a P0601 for internal memory failure. After verifying the main power and ground circuits to the PCM were solid, it was clear the module itself was failing intermittently. We installed one of our VIN-programmed PCMs, performed the quick security relearn, and the truck fired up instantly. The owner called a week later to say his truck had never run better. This is a classic failure scenario for these vehicles, and a properly programmed module is the key to a lasting fix.
Is Your GM Truck Showing These Signs?
A failing PCM can manifest in various ways. As the central computer for your engine and transmission, its failure can mimic other problems. Here are the most common symptoms I’ve seen in my 20+ years of experience:
- ✔ Check Engine Light is on with codes like P0601, P0606, or other internal processor faults.
- ✔ Vehicle refuses to start or cranks but won’t turn over.
- ✔ Random stalling while driving or at idle.
- ✔ Poor fuel economy and noticeable loss of power.
- ✔ Harsh or erratic transmission shifting.
- ✔ Communication loss codes (U-codes) with other modules.
- ✔ Inaccurate or non-functioning gauges on the instrument cluster.
A Straightforward Guide to Installation
Replacing the PCM on these GM trucks is a job most DIYers can handle in under an hour. Our pre-programmed module eliminates the need for expensive scan tools or a trip to the dealership. Follow these general steps for a successful installation:
- Safety First: Always disconnect the negative terminal from your vehicle’s battery and secure it away from the post.
- Locate the PCM: On most Silverado and Sierra models, the PCM is located on the driver’s side, mounted to the frame rail area below the battery tray and behind the headlight.
- Disconnect the Connectors: Carefully unlatch and remove the electrical harness connectors from the old PCM. These connectors have locking tabs; be gentle to avoid breaking them.
- Remove the Old Module: Unbolt the PCM from its mounting bracket. It’s typically held in place by a couple of bolts.
- Install the New PCM: Mount your new, pre-programmed PCM onto the bracket and securely fasten the bolts.
- Reconnect Everything: Plug the electrical connectors firmly into the new module until they click into place. Reconnect your negative battery terminal.
- Perform Security Relearn: You will need to perform a simple security relearn procedure (often called a ‘key-on’ relearn) to sync the new PCM with your vehicle’s anti-theft system. This typically involves turning the key to the ‘ON’ position for 10-15 minutes. Instructions are readily available online for your specific model.
Verified Vehicle Compatibility
This module is a direct replacement for service number 12602802 and is compatible with a wide range of GM trucks and SUVs. Please verify your vehicle is on the list below. Matching the ID number from your original module is the best way to ensure perfect compatibility.
ESCALADE 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE EXT 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 04 Electronic Control Module; (LH front under battery), SUV
SIERRA 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
TAHOE 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
ENVOY XL 03 Electronic Control Module; 5.3L (next to air box)
SUBURBAN 2500 03 Electronic Control Module; (LH front under battery), 6.0L
YUKON 04 Electronic Control Module; (LH front under battery), ID 12602802
YUKON XL 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
AVALANCHE 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
SIERRA 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/o 4.3L
SIERRA DENALI 05-06 Electronic Control Module; (LH front under battery)
SUBURBAN 2500 04 Electronic Control Module; (LH front under battery), 6.0L, ID 12602802
YUKON XL 1500 03 Electronic Control Module; (LH front under battery)
YUKON XL 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ESCALADE ESV 03 Electronic Control Module; (LH front under battery), PCM
ESCALADE ESV 04 Electronic Control Module; (LH front under battery), ID 12602802
HUMMER H2 07 Electronic Control Module; (LH front under battery), powertrain control
SIERRA 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 03 Electronic Control Module; (LH front under battery)
HUMMER H2 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON 03 Electronic Control Module; (LH front under battery)
ESCALADE 05-06 Electronic Control Module; (LH front under battery)
ESCALADE ESV 05-06 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
AVALANCHE 1500 03 Electronic Control Module; (LH front under battery)
SILVERADO 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SILVERADO 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
TAHOE 03 Electronic Control Module; (LH front under battery)
TAHOE 05-06 Electronic Control Module; (LH front under battery)
YUKON 05-06 Electronic Control Module; (LH front under battery)
SILVERADO 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SILVERADO 3500 PICKUP 05-06 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 04 Electronic Control Module; (LH front under battery), ID 12602802
ISUZU ASCENDER 03 Electronic Control Module; (LH engine), 5.3L
SIERRA 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
SIERRA 1500 PICKUP 04 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L; ID 12602802
ESCALADE 03 Electronic Control Module; (LH front under battery), PCM
SSR 03 Electronic Control Module; (next to air box)
SIERRA 2500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SIERRA DENALI 07 Electronic Control Module; classic style (creased door skin), (LH front under battery)
SILVERADO 3500 PICKUP 03 Electronic Control Module; (LH front under battery), gasoline, 6.0L
SUBURBAN 1500 05-06 Electronic Control Module; (LH front under battery)
TRAILBLAZER EXT 03 Electronic Control Module; 5.3L (next to air box)
SILVERADO 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SILVERADO 1500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), w/o hybrid option; w/o 4.3L
SILVERADO 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
YUKON XL 1500 05-06 Electronic Control Module; (LH front under battery)
ESCALADE EXT 05-06 Electronic Control Module; (LH front under battery)
SIERRA 1500 PICKUP 05-06 Electronic Control Module; (LH front under battery), w/o hybrid option; w/o 4.3L
SUBURBAN 2500 05-06 Electronic Control Module; (LH front under battery), 6.0L
HUMMER H2 03 Electronic Control Module; (LH front under battery)
SIERRA 2500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA 3500 PICKUP 07 Electronic Control Module; classic style (creased door skin), (LH front under battery), gasoline, 6.0L
SIERRA DENALI 04 Electronic Control Module; (LH front under battery), ID 12602802
SILVERADO 1500 PICKUP 03 Electronic Control Module; (LH front under battery), w/o 4.3L
ESCALADE EXT 03 Electronic Control Module; (LH front under battery), PCM
SIERRA 3500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
SILVERADO 2500 PICKUP 04 Electronic Control Module; (LH front under battery), gasoline, 6.0L, ID 12602802
YUKON XL 2500 03 Electronic Control Module; (LH front under battery), 6.0L
Do I need to do anything after installing this PCM?
Do I need to do anything after installing this PCM?
Yes. After installation, you must perform a vehicle security relearn procedure. This syncs the new PCM to your vehicle’s anti-theft system and keys. It’s a simple process that usually takes about 30 minutes and does not require special tools.
What information do you need to program the module?
We need your vehicle’s 17-digit Vehicle Identification Number (VIN). Please provide the VIN from the truck the part is being installed in to ensure we load the correct factory software and calibrations.
How do I find my original part number?
The part number (or service number) is printed on a sticker on the case of your original PCM. Matching this number is the best way to confirm compatibility, though this module replaces several different service numbers.
Will this fix my transmission problems?
It can. The PCM controls both engine and transmission functions. If your shifting problems, such as late or hard shifts, are caused by a faulty module, this part will resolve them. However, it will not fix internal mechanical issues with the transmission.