U1110

SYMPTOM
U1110 - LOST VEHICLE SPEED MESSAGE

WHEN MONITORED
Ignition on.

SET CONDITION
The PCM doesn't receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus.

POSSIBLE CAUSES
- CAN C BUS CIRCUIT OPEN OR SHORTED
- ANTI-LOCK BRAKE MODULE
- PCM

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Scan Tool Testing and Procedures

THEORY OF OPERATION
The PCM receives the vehicle speed signal over the CAN C bus from the Antilock Brake Module.

DIAGNOSTIC TEST
1. ACTIVE DTC





Ignition on, engine not running.
With the scan tool read Powertrain DTCs.
Is the DTC active at this time?
Yes>> Go To 2
No>> Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5. Powertrain Verification Test - Ver 5

2. U0121-LOST COMMUNICATION WITH ABS MODULE ALSO SET





With the scan tool continue reading DTCs.
Is the U0121-LOST COMMUNICATION WITH ABS MODULE also set?
Yes>> Follow the diagnostics for U0121-LOST COMMUNICATION WITH ABS MODULE Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.
No>> Replace and program the Powertrain Control Module per Service Information. Perform (NGC) POWERTRAIN VERIFICATION TEST VER-5.