C0800

DTC C0800

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle (Initial Inspection and Diagnostic Overview) prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis (Initial Inspection and Diagnostic Overview) for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions (Initial Inspection and Diagnostic Overview) provides an overview of each diagnostic category.



DTC Descriptors
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 volts or above 16 volts, 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.


Reference Information
Schematic Reference

Cruise Control Schematics (Conventional) (Cruise Control Schematics (Conventional))Cruise Control Schematics (Adaptive) (Cruise Control Schematics (Adaptive))
Connector End View Reference

Component Connector End Views (Connector Views)
Electrical Information Reference

* Circuit Testing (Component Tests and General Diagnostics)
* Connector Repairs (Component Tests and General Diagnostics)
* Testing for Intermittent Conditions and Poor Connections (Component Tests and General Diagnostics)
* Wiring Repairs (Component Tests and General Diagnostics)

Scan Tool Reference

Control Module References (Programming and Relearning)for scan tool information


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.




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 (Verification Tests) after completing the diagnostic procedure.


Control Module References (Programming and Relearning)for ACM replacement, setup, and programming