Description
Caterpillar 950K control module repair | J5M00353
Our bench handles your Caterpillar 950K control module repair and returns the unit ready to work. First, you ship the module to our shop in Mount Dora, Florida. Then our engineers diagnose every fault on the board.
After that, we rebuild the failed sections and test under load. As a result, the controller goes back on the exact machine it came from.

Part numbers covered by this service
- 340-8157-04 and 340815704
- 3453388-04 and 345338804
- Serial prefix J5M00353
Several references describe the same controller. Therefore, check the label on your module before you ship it. Also, send a photo of the connector if you have any doubt.

Machines covered by the Caterpillar 950K control module repair
- Wheel loaders: 950K, 962K
- Excavators: 324E, 324E L, 324E LN, 329E, 329E L, 329E LN
- Motor grader: 120M 2
- Other machines: 2570C, 2670C, 563C, 573C
- Engine: C7.1
However, serial ranges matter across this family. Consequently, we record your machine model before we start.

Common faults we fix during a Caterpillar 950K control module repair
- Blowing fuses
- No communication with the diagnostic tool
- Engine shutting down
- Fault codes stored in the unit
- Intermittent faults under vibration
- Oil intrusion
- Water damage
However, many units arrive with more than one symptom. Consequently, we test every circuit before we close the housing.
Why these controllers fail on the job
Vibration and heat work against every board on a loader. First, the solder joints crack after thousands of hours. Then moisture reaches the tracks through a tired seal.
In addition, a weak alternator sends spikes into the supply rails. As a result, the output drivers fail one by one. Moreover, a jump start with reversed cables can end the board in seconds. Therefore, we check the machine charging data before we return the unit.
How our bench tests the board
First, we open the housing and inspect the tracks under magnification. Then we measure the supply rails and the output drivers.
Next, we replace the components that fail the test. After that, the board runs a full cycle on our simulator. As a result, an intermittent fault shows up before the unit leaves.
What to send with your module
Send the module with your contact details and the machine data. First, note the machine model and the serial number. Then add the fault codes your technician reads on site.
Moreover, tell us how the failure appears during work. For example, some units only fail when the machine warms up. As a result, our bench can reproduce the same condition.
Turnaround and shipping for your Caterpillar 950K control module repair
We start the diagnosis as soon as your parcel arrives. Then we report what we find before we continue. In addition, we ship the repaired unit back with tracking. Because of that, you always know where your controller is. Moreover, we keep the bench record on file for the whole warranty period. For example, we can compare the original data with your new readings later.
Warranty and technical support
A one year warranty backs every Caterpillar 950K control module repair we deliver. Also, our team answers technical questions before and after the job. For example, you can describe the fault codes you read today.
Why trust our bench
Our engineering team carries more than 15 years of experience. Furthermore, we have rebuilt over 10,000 modules to date. Our simulation equipment reproduces the real machine signals during testing.
Order your Caterpillar 950K control module repair
Ready to start? First, read our ECM repair services process. Next, browse the full Caterpillar ECM range. Finally, watch real bench tests on the ECM Engineering USA YouTube channel.




