Is Your GM Truck Running Rough or Not Starting at All?
As a mechanic with over two decades of experience under the hood, I’ve seen it all. A customer’s 2005 Silverado 2500 with the 6.0L came into my shop last month. It was cranking but wouldn’t start, and the check engine light was on with a P0606 (PCM Processor Fault) code. After confirming the basicsโgood fuel pressure, spark, and clean groundsโwe knew the Powertrain Control Module (PCM) had failed. This is a frustratingly common issue on these otherwise reliable GM trucks and SUVs.
Your vehicle’s PCM is its brain, controlling everything from fuel injection and spark timing to transmission shifting. When it fails, you can experience a host of problems that can leave you stranded. This isn’t just an inconvenience; it’s a critical failure that needs a reliable solution.
The Direct-Fit Solution: A Pre-Programmed 2003-2007 Sierra 2500 PCM
Forget the hassle and high cost of a dealership visit. This Powertrain Control Module is the definitive solution for your 2003-2007 GM truck or SUV. We take all the guesswork out of the repair. Simply provide us with your vehicle’s VIN during checkout, and our technicians will program the module with the latest, most stable software updates directly from GM. It arrives at your door ready for a straightforward, plug-and-play installation.
Symptoms of a Failing GM PCM This Part Corrects:
- โ Check Engine Light (CEL) with communication-related codes (e.g., U-codes, P0601, P0606).
- โ Engine cranks but will not start.
- โ Rough or erratic idle and stalling.
- โ Harsh or incorrect transmission shifting.
- โ Poor fuel economy and loss of power.
- โ No communication with your scan tool.
Plug-and-Play Installation: No Dealer Visit Required
You can get your truck back on the road in under an hour with basic hand tools. This module is designed for a direct swap.
- Safety First: Disconnect the negative battery terminal and wait 10 minutes for the system to discharge.
- Locate the PCM: On most of these trucks (like the Sierra, Silverado, Tahoe, and Yukon), the PCM is located on the driver’s side, under the hood, near the battery and airbox.
- Disconnect and Remove: Carefully unplug the electrical connectors. They have locking tabs that need to be released. Then, unbolt the module from its mounting bracket.
- Install the New Module: Bolt the new, pre-programmed PCM into place. Firmly reconnect the electrical harnesses until they click, ensuring the locking tabs are engaged.
- Reconnect and Start: Reconnect the negative battery terminal. The vehicle may require a security relearn procedure, which typically involves turning the key to the ‘ON’ position for 10-15 minutes. In some cases, a Crankshaft Variation (CASE) relearn with a capable scan tool may be necessary to clear a P1336 code, though the truck will still run without it.
This module is a direct replacement for multiple service numbers, including 89017750, 12582605, 12589463, 12602802, and 89017734. Please verify your fitment using the compatibility chart to ensure this is the correct part for your specific year, make, and model. Restore your vehicle’s reliability and performance today.