Engine Electrical

DTC C0800

DTC Descriptor

DTC C0800 03
- Device Power 1 Circuit Voltage Below Threshold

DTC C0800 07
- Device Power 1 Circuit Voltage Above Threshold

Circuit/System Description

The adaptive cruise module (ACM) monitors the ignition 1 voltage circuit to determine if the voltage is within the normal operating range. When the ACM detects that the ignition 1 voltage is below 9.2 V or above 16 V, the DTC C0800 sets.

Conditions for Running the DTC

C0800 03 and 07

* Ignition is in RUN.
* Vehicle moving at a speed greater than 40.2 km/h (25 mph).

Conditions for Setting the DTC

C0800 03

* The ACM detects that the ignition 1 voltage is less than 9.2 volts.
* The above condition is present for 7 seconds.

C0800 07

* The ACM detects that the ignition 1 voltage is greater than 16 volts.
* The above condition is present for 7 seconds.

Action Taken When the DTC Sets

C0800 03 and 07

The following actions occur:

* Loss of adaptive cruise function.
* Cruise Not Ready indicator illuminates in the DIC.

Conditions for Clearing the DTC

* The DTC becomes history when the fault is no longer present.
* A History DTC clears after 100 malfunction free ignition cycles.
* The ACM receives a clear code command from the scan tool.

Diagnostic Aids

Using the Failure Records data may help locate an intermittent condition. If you cannot duplicate the DTC, the information in the Failure Records can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can help determine how many ignition cycles that the diagnostic test reported a pass and/or a fail.

Circuit/System Verification

1. Ignition ON, verify that DTC P0562, P0563 in the ECM and/or B1325 in the BCM are not current.

• If one of those DTCs is found as a current DTC, refer to Diagnostic Trouble Code (DTC) List - Vehicle. Diagnostic Trouble Code Descriptions

2. Verify that DTC C0800 is current in the scan tool.

• If the DTC is not current, refer to Charging System Test. Charging System Test
• If the DTC is current, go to Circuit/System Testing in Diagnostic Aids. Component Tests and General Diagnostics

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector of the adaptive cruise module (ACM).
2. Ignition ON, test for greater than 9.2 volts between the ignition 1 voltage circuit terminal 14 and ground.

• If less than the specified value, test the voltage circuit for an open/high resistance.

3. Ignition ON, test for greater than 9.2 volts between the ignition 1 voltage circuit terminal 14 and the ground circuit terminal 12.

• If less than the specified value, test the ground circuit for an open/high resistance.

4. Engine ON, test for less than 16 volts between the ignition 1 voltage circuit terminal 14 and ground.

• If greater than the specified value, test the voltage circuit for a short to voltage. If the circuit tests normal, refer to Charging System Test. Charging System Test

5. If all circuits test normal, test or replace the ACM.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure. Verification Tests

Control Module References for ACM replacement, setup, and programming.