ECU Guides

Chevrolet Cruze and Captiva 6T40 TCM Dump 24257276: Replacement, Immo Link and Relearn

20 October 2026 4 min read

Chevrolet Cruze 1.8 petrol, 2012, 6T40 automatic. Check engine light, P0700, P0722 output speed sensor, and the shift into 3rd is a bang. The scanner also shows the TCM dropping off the bus now and then. On this gearbox the TCM is the TEHCM, the control module bolted to the valve body inside the sump, with the solenoids and speed sensors on the same assembly. The number stamped on it, 24257276, is what you’ll be searching for.

Numbers you’ll see on 6T40/6T45 units

  • 24257276: Cruze / Captiva / Orlando 6T40 TCM, common on the 1.8 petrol Cruze.
  • 24258587: 6T40/6T45 TCM, later software, seen on Cruze and Captiva.
  • 24253564: another 6T40/6T45 revision; check the stamp, not the parts book.
  • 13574841: Cruze BCM. Not a gearbox part, but relevant because it’s the immobiliser hub the TCM is paired to.
  • 55565728: Opel Corsa D gearbox control unit in our catalogue. A different transmission family (on most versions the automated manual), listed on the same shelf because people ask for both together.

Read the number off the TEHCM itself, because dealers supersede these numbers and a superseded unit still carries the original stamp.

Is the TCM really at fault?

Before you drop the sump, be honest about the hydraulics. Half the 6T40 units we see replaced had solenoid or valve body faults, not electronics:

  • P0711, P0712, P0713 (fluid temperature sensor): the sensor lives on the TEHCM, so this one is the module.
  • P0716, P0717, P0722: speed sensors, also on the TEHCM.
  • P0751 to P0760, P2714, P2723: solenoid performance. Could be a stuck valve or a dirty filter; check fluid level and condition first.
  • U0101 lost communication with TCM, intermittent: look at the pass-through connector seal in the case. Fluid in the connector corrodes the pins and mimics a dead module.

On the Cruze, Captiva and Orlando the TCM is part of the theft deterrent chain on most versions. The BCM (13574841 on our Cruze listing) holds the security data and the TCM stores a matching link. A used TCM from another car will shift, sometimes, but you’ll get a theft deterrent code and the engine ECU may refuse to start. That’s why a TCM dump matters: writing your car’s data into the donor keeps the link intact, and a virgin TCM dump lets the dealer tool run the learn.

Replacing with a used TCM: procedure

  1. Read the original TEHCM if it still communicates. Bench tools that list the 6T40 (KT200, FoxFlash, and Autotuner on some licences) read it via boot.
  2. Get a donor with the identical stamped number. 24257276 and 24258587 are not a straight swap despite fitting the same valve body; the calibration differs.
  3. Write the original dump into the donor. If the original is dead, use a matching dump from us and plan on the security learn.
  4. Fit with new seals, fill, then connect GDS2 with an MDI (or Tech2 on the earliest cars). Run the adaptive values reset and the Transmission Service Fast Learn.
  5. If you fitted a virgin TCM, run the theft deterrent learn in GDS2 so the BCM accepts the new module.
  6. Drive it: fast learn needs warm fluid and specific throttle inputs, and the tool walks you through them.

What about an Opel badge?

The Opel Astra J, Insignia and Mokka share the 6T40/6T45 and the same TCM numbers. The difference is the diagnostic tool: GlobalTIS with an MDI, or an aftermarket tool that supports GM SPS-style programming.

Does the dump reset the adaptation values?

The dump carries the adaptations of the car it came from. That’s one more reason to write your own dump into the donor and then run fast learn, rather than driving on someone else’s adaptations.

Can I skip the fast learn if the box shifts fine?

It will shift fine for a week and then start flaring as the old adaptations fight the new clutch wear. Do the learn. It takes twenty minutes with the tool and saves a comeback.

The 6T40 TCM dumps 24257276, 24258587 and 24253564, the Cruze BCM 13574841 and the Corsa D 55565728 are in the gearbox category; engine files for the same cars sit on the Chevrolet and Opel pages. If you have a stamped number we haven’t listed, send it through the request form with the gearbox code from the label.

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