DTC 55

DTC 55 (P1571): Motor Commutation Sensor Voltage Input Problem

NOTE: If some of the DTCs listed below are stored at the same time as DTC 55, troubleshoot those DTCs first, then recheck for DTC 55.

DTC 16, 17: Motor commutation sensor A
DTC 18, 52: Motor commutation sensor B
DTC 53, 54: Motor commutation sensor C
1. Reset the MCM.
2. Start the engine.
Is DTC 55 indicated?
YES-Go to step 3.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the motor commutation sensor and at the MCM.
3. Turn the ignition switch OFF.
4. Check for a poor connection at the motor commutation sensor 10P connector.
Is the connection OK?
YES-Go to step 5.
NO-Repair the poor connection at the motor commutation sensor 10P connector, then go to step 8.
5. Turn the battery module switch OFF.
6. Remove the IPU lid.
7. Check the connection at MCM connector D (16P)
Is the connection OK?
YES-Go to step 8.
NO-Repair the poor connection at MCM connector D (16P). then go to step 8.
8. Reset the MCM.
9. Start the engine.
Is DTC 55 indicated?
YES-Substitute a known-good MCM, and recheck. If the symptom/indication goes away, replace the original MCM.
NO-Intermittent failure, system is OK at this time. Check for poor connections or loose terminals at the motor commutation sensor and at the MCM.