What this code means
P1898 may indicate a CVT hydraulic control issue related to pulley pressure control operation.
What the vehicle may do
- The vehicle may show symptoms during acceleration.
- The transmission may feel abnormal when the monitor conditions are met.
- The concern can be intermittent.
Possible fault areas
- Possible CVT pulley pressure control solenoid involvement.
- Possible hydraulic control issue inside the CVT control system.
- Possible intermittent condition that only appears under specific operating conditions.
Diagnostic path
Opening context
On this Accord, P1898 points us toward a possible CVT hydraulic control problem. The vehicle may have driveability complaints during acceleration, and the fault area can involve the CVT pulley pressure control side of the system, related solenoid control, or an intermittent condition that only shows up under the right operating conditions. Before clearing anything, save the freeze data and any on-board snapshot with the HDS, then start with the basic system checks so you know what the car was doing when the code set.
Problem verification
For the P1898 diagnostic path, turn the ignition ON, then clear the DTC with the HDS. Start the engine and run the vehicle under the same kind of load the monitor is looking for. Test-drive it in D until vehicle speed reaches 37 mph (60 km/h). Then slow down, stop the vehicle, and accelerate from a stop at full throttle in D until vehicle speed reaches 37 mph (60 km/h) again.
Check whether the fault resets
After that drive pattern, check Pending and Confirmed DTCs with the HDS. If P1898 comes back along with its related transmission code, the diagnostic path calls for replacement of the CVT drive pulley pressure control solenoid valve and/or the CVT driven pulley pressure control solenoid valve, then move into repair verification. If the code does not return, treat it as an intermittent failure; the system is OK at this time.
Repair verification setup
Keep repair verification separate from the initial problem check. Turn the ignition ON, clear the DTC with the HDS, and start the engine. Now perform the verification drive in D. From a stop, accelerate at over 0.6/8 throttle, using 1.26 V of APP sensor voltage while monitoring APP Sensor A (V) with the HDS, until vehicle speed reaches 37 mph (60 km/h) on a flat road for at least 12 seconds. Then slow down, stop the vehicle, and accelerate from a stop at full throttle in D until vehicle speed reaches 37 mph (60 km/h).
OBD status decision
With the drive completed, monitor the OBD STATUS for P1898 and its related code in the DTC menu with the HDS. If the status shows PASSED, troubleshooting is complete. If a PCM had been substituted during the work, replace the original PCM, and if any other Pending or Confirmed DTCs are present afterward, check what they mean first. If the status shows FAILED, the troubleshooting is not complete; go back to the beginning and recheck the path. If the PCM was updated, substitute a known-good PCM and check the OBD STATUS again. If the status shows NOT COMPLETED, the verification drive did not satisfy the monitor; meet the test conditions and check OBD STATUS again.
Takeaway
The key on P1898 is to prove whether the fault resets under the required CVT load conditions, make the supported solenoid repair only when the code path confirms it, and then verify the monitor status instead of guessing. For more diagnostic training, visit stepdiagnostics.com.
Final check
Use the drive pattern and scan tool status to confirm whether P1898 is current, intermittent, or repaired.
For more guided automotive diagnostics, visit STEP Diagnostics.
