If your Tesla Model 3 or Model Y is showing a “D/C Charging Unavailable” message, or you’ve spotted an error in Service Mode like “inletHarnessIrrational”, you’re not alone – and more importantly, we can fix it.
What’s the “D/C Charging Unavailable” Issue?
A leading cause of DC fast charging failure on the Tesla Model 3 and Model Y is a fault with the W Harness – a vital component of the charging system. This issue commonly triggers an internal service alert, such as:
CP_a100_inletHarnessIdIrrational
In Service Mode, this error may include messages like:
“The charge port ECU detects unexpected voltage at the inlet harness identifier pins or is unable to identify the type of inlet harness.”
The Solution: W Harness Repair
At Cleevely EV Mobile, we now offer a dedicated W Harness Repair service for both Model 3 and Model Y vehicles. Our expert technicians are all IMI-certified in high voltage systems, so your Tesla is in the safest possible hands.
We’ve seen this problem many times and have developed a fast, effective repair method to restore full charging capability.
How to Check for the source of the “D/C Charging Unavailable” Issue
- Access Service Mode on your Tesla (watch our quick how-to video here).
- Look for alerts like “inletHarnessIdIrrational” or messages such as “D/C Charging Unavailable.”
- Take a clear photo of the screen showing the alert.
Book Your W Harness Repair
When booking your appointment, please request the “W Harness Repair” and upload a photo of the error screen in Service Mode. This helps us verify the issue and get you booked in without delay.
📩 Submit your booking and upload your photo here:
👉 cleevelymobile.co.uk/contact
Why Cleevely EV Mobile?
✅ Specialist repair for a known Tesla Model 3 & Y charging fault
✅ Fast, mobile service – we come to you
✅ Experienced, IMI-trained EV technicians
✅ Proven fix for D/C charging failure
✅ Mobile service – we come to you
✅ Trusted UK EV experts