The electronic suspension control (ESC) module provides a common low reference for all four of the suspension damper solenoids. The ESC module internally monitors the return voltage on the low reference circuit for a voltage out of range condition.

Continuously with the ignition on.

The ESC module internally senses a low reference voltage out of range condition.

Important: Ignition cycle counting is used by the ESC module to detect faults in the system. The objective is to eliminate false/intermittent codes while maintaining an acceptable level of system performance. The operation of the ignition cycle counting requires that a fault condition be present for four consecutive ignition cycles before it will set the fault code and display the "SERVICE RIDE CONTROL" message. If a fault code is present (without a fault being current), the system will go into one or more degraded modes without displaying a message. Resetting the ignition cycle counter is done by clearing codes with a scan tool. Clearing codes will override ignition cycle counting for one ignition cycle. Therefore, a fault condition will set the fault code immediately if it occurs on the first ignition cycle after the codes are cleared.

Most occurrences of this DTC are caused by connector C450 not full seated, backed out or has a bent terminal.

The following conditions may cause a malfunction to occur:

The numbers below refer to the step numbers on the diagnostic table.

2. Tests whether the condition has been corrected or identified as specified in the supporting text.

3. Tests all 4 low reference circuits of the suspension damper solenoids for an open.

4. Tests all 4 control circuits of the suspension damper solenoids for an open.

5. Tests the solenoid ground circuit at the ESC module, should be less than 0.5 ohm.

7. Clear DTCs and checks to see if DTC will reset.