2019 sierra AT4 P062f-00

[Fowler]

I have a 2019 Sierra AT4 with a 5.3 engine. After experiencing a ground failure and replacing that along with a new battery, I found that I was left without 4WD. I scanned the system, but it didn’t show a TCCM (Transfer Case Control Module), so I thought it might be due to my cheap scanner. I upgraded to a new scanner, but it still didn't show the TCCM. However, when I unplugged the fuse for the TCCM and reinstalled it, I scanned again, and now it shows the TCCM with the code P062F-00.

My question is: Is there something I can try to get the 4WD working again, or am I looking at needing a new TCCM or addressing something else entirely? I tried clearing the code, but it keeps coming back. All the other codes cleared except for one related to the battery for the key fob, which persists after I installed new batteries. Additionally, the left-side camera has failed, but getting the 4WD back up and running is my main priority.

2019_GMC_Sierra_1GTP9EED0KZ160844_Report_2025-08-27 0452.pdf

[davester]

Well, you might go through the diagnostic procedure for that code, to find what is causing it.  The TCCM might need to be replaced, but it might just have a bad power or ground connection, or something else causing it.

 

alldata.com will have a vehicle-specific diagnostic procedure you can work through, to find the cause, to then fix it.

[Fowler]

Thanks I'll give that a go at first thanks 

[Tom73]

Here is some general info found online. May be somewhat helpful. 
_____________________________
 

What Does the P062F Code Mean?

The P062F code specifically refers to a failure within the PCM’s internal EEPROM (Electrically Erasable Programmable Read-Only Memory). This memory is crucial for storing data and configurations that allow the PCM to manage the engine and other components effectively.

What Causes the P062F Code?

Several factors can trigger the P062F code, including:

• Control module failure
• Powertrain Control Module (PCM) failure
• Wiring issues that affect communication to and from the PCM

What Are the Symptoms of the P062F Code?

When the P062F code is present, you may notice the following symptoms:

 

• Illumination of additional warning lights on the instrument cluster
• Potential performance issues related to engine management
• Unresponsive vehicle systems controlled by the PCM

How Serious Is the P062F Code?

The P062F code is classified as urgent, indicating that immediate attention is necessary. Ignoring this code can lead to significant damage to the vehicle’s systems and may pose safety risks to the driver and passengers.

How to Diagnose the P062F Code

To accurately diagnose the P062F code, follow these steps:

1. Use an OBD-II scanner to confirm the presence of the P062F code and check for any accompanying codes.
2. Inspect the wiring and connectors related to the PCM for any signs of damage or corrosion.
3. Perform a visual inspection of the PCM itself for any physical damage.
4. Check the vehicle’s battery and charging system, as electrical issues can affect the PCM’s performance.
5. Consider running a PCM self-diagnosis test if available.

Common Repairs for the P062F Code

Repairing the P062F code may involve:

• Replacing the faulty PCM
• Repairing or replacing damaged wiring and connectors
• Resetting the PCM and reprogramming if necessary

How Much Does It Cost to Fix the P062F Code?

The cost to fix the P062F code can vary widely depending on the specific issue and whether you need to replace the PCM. On average, you can expect to pay:

• PCM replacement: $800 – $2,500
• Wiring repairs: $100 – $500

Can I Fix the P062F Code Myself?

While some aspects of diagnosing and repairing the P062F code can be tackled by experienced DIYers, such as inspecting wiring and connectors, replacing the PCM typically requires specialized knowledge and tools. For most vehicle owners, it is advisable to consult with a professional mechanic to ensure proper diagnosis and repair.

[Fowler]

I was reading about this on Google the other day, and my situation is that there is no engine light on and I have no issues other than the fact that my four-wheel drive (4WD) isn't working. Everything else is functioning perfectly. 

This problem started after I had a bad ground issue, which led to a no-start condition. I found and replaced the faulty ground, but now I can't engage the 4WD. Initially, the Transmission Control Module (TCCM) wasn't showing up until I pulled out the fuse and reinstalled it. Now, I have a long-term memory issue, and the code is showing up under my TCCM module. I'm not sure if the problem might be related to the Transmission Control Module (TCM).

[silveradosid]

have someone listen to the front diff to see if the actuator for the diff is working

[Fowler]

i was talking with a guy to day he said that the transfer case motor is a big problem with them so gonna throw a rock in the dark and hope it works

[Fowler]

installed new transfer case motor tonight and still same thing starting to point towards the tccm i guess