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DTC guide

DTC guide

P1890 CVT Speed Control System

P1890 can indicate a CVT drive pulley speed-control fault.

Engine diagnostics2025 Honda Accord 1.5 turbo

Quick answer

P1890 can indicate a CVT drive pulley speed-control fault.

Vehicle coverage: 2025 Honda Accord 1.5 turbo. Confirm the exact configuration and applicable safety procedure before testing or repair.

On this page
  1. What this code means
  2. What the vehicle may do
  3. Possible fault areas
  4. Diagnostic path
  5. What P1890 means
  6. Before troubleshooting
  7. Check other CVT codes first
  8. Transmission work item
  9. Separate confirmation procedure
  10. Related scanner labels
  11. More diagnostic steps
  12. Final check
P1890 CVT Speed Control System diagnostic guide

What this code means

P1890 can indicate a CVT drive pulley speed-control fault.

What the vehicle may do

  • The TCM may store P1890 for a drive pulley speed difference.

Possible fault areas

  • The transmission may be an area to check.

Diagnostic path

What P1890 means

On this 2025 Honda Accord 1.5, P1890 means a CVT Speed Control System fault. It can involve a difference between the target drive pulley speed and the actual drive pulley speed. In D, S, L, or R, if that difference falls within a certain range, the TCM flags a fault and stores P1890. Here is what this code tells us. The TCM may store P1890 for a drive pulley speed difference. Here are the main areas to check. The transmission may be an area to check.

The target speed is the reference, and the actual drive pulley speed is the value compared with it. The fault condition concerns the difference between those values falling within the stated abnormal range in D, S, L, or R—not either speed considered by itself.

Before troubleshooting

Before you troubleshoot, review how to troubleshoot this system.

Check other CVT codes first

Troubleshoot any DTCs listed or indicated systems below first. － CVT System \[AT\]: Go to the indicated DTC's troubleshooting (except DTC P1890).

If other CVT System \[AT\] codes are present, troubleshoot those codes first. P1890 is excluded from this prerequisite.

Transmission work item

The listed inspection item is the transmission. Its associated work item is transmission replacement.

Separate confirmation procedure

Here is how the separate Confirmation Procedure is defined. Start the engine. Test-drive the vehicle in D position/mode on a flat road. Accelerate slowly until vehicle speed reaches 37 mph (60 km/h). Then keep the vehicle at speeds about 37 mph (60 km/h) for at least 60 seconds. Slow down and stop the vehicle.

The fault description covers D, S, L, or R, but this separate Confirmation Procedure specifically uses D. Reaching 37 mph (60 km/h) completes only the slow-acceleration portion on the flat road; the following hold at about that speed for at least 60 seconds is also part of the procedure. Simply reaching the speed is not the same as completing the prescribed drive.

For the diagnostic scanner (HDS), the related labels are HDS Function and AT ＞ Data List.

More diagnostic steps

For more diagnostic steps, visit stepdiagnostics.com.

Final check

P1890 can involve the difference between target and actual drive pulley speed.

For more guided automotive diagnostics, visit STEP Diagnostics.

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