Oh no. Code P123c. Anyone seen this?

[luciddaydream]

Hi there,

I have an Emira with 3rd cat delete, JB4, and Eventuri intake. Car's been good all year.

BUT - now I'm seeing a check engine light. When I use the JB4 to read the code, it comes back as P123C.

From what I've found, P123C is a Lotus-specific code meaning the charge cooler pump isn't running. The usual cause is a low charge cooler coolant tank (the small pink-fluid bottle in the top-left of the engine bay). I checked mine and it's full, sitting right between MIN and MAX. So it's not the easy fix.

A few questions for anyone who's been through this:

-Has anyone had P123C with a full tank? Was it the pump itself, a connector, or wiring?
-Is there a simple way to confirm the pump is running? Listen for it at key-on, feel the hose, etc.?
-Could the JB4 be involved here? It sits on the boost/MAP signals, so I'm wondering if it could trip this code or if it's purely the pump circuit.-
-Any risk driving it short distances in the meantime?

Not seeing any overheating or obvious symptoms otherwise. Would appreciate any pointers. I don't wnat to send it to a dealer..

 

[JonFuller]

I had a P123c, turned out to be a failed chargecooler circ pump that was working ok, but apparently not reporting back to the ECU as it should, which caused the CEL & P123c.

Bell & Colvill had the car for a couple of days, worked with Lotus doing various tests to diagnose the issue, and the pump was replaced under warranty.

 

[geoffbland]

Hi there,

I have an Emira with 3rd cat delete, JB4, and Eventuri intake. Car's been good all year.

BUT - now I'm seeing a check engine light. When I use the JB4 to read the code, it comes back as P123C.

From what I've found, P123C is a Lotus-specific code meaning the charge cooler pump isn't running. The usual cause is a low charge cooler coolant tank (the small pink-fluid bottle in the top-left of the engine bay). I checked mine and it's full, sitting right between MIN and MAX. So it's not the easy fix.

A few questions for anyone who's been through this:

-Has anyone had P123C with a full tank? Was it the pump itself, a connector, or wiring?
-Is there a simple way to confirm the pump is running? Listen for it at key-on, feel the hose, etc.?
-Could the JB4 be involved here? It sits on the boost/MAP signals, so I'm wondering if it could trip this code or if it's purely the pump circuit.-
-Any risk driving it short distances in the meantime?

Not seeing any overheating or obvious symptoms otherwise. Would appreciate any pointers. I don't wnat to send it to a dealer..

I would clear the code and see if it comes back, just in case it was a timing glitch.
If it does you'll need the dealer to look at it as others have said. You might want to consider your warranty with the dealership and temporarily removing the JB4.