Starter Noise / Unwanted Engagement No Start SES Reduced Power A/C inop
| Subject: | Starter Noise/Unwanted Engagement, No Start, SES, Reduced Power, A/C Inop |
| Models: | 2008 Buick Lucerne w/ V6 Engine |
The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI.
Condition/Concern:
A customer may comment they experience one or more of the following concerns.
| • | Check Engine Light On |
| • | Reduced Power Message on the Driver Information Center (DIC) |
| • | No Start/ No Crank |
| • | Starter engages while the engine is already running |
| • | Noise from the engine compartment |
| • | A/C inop |
Inspection of the vehicle may reveal one or more fuses in the underhood fuse block listed below are open.
| • | FUEL INJ ODD |
| • | FUEL ING EVEN |
| • | ECM CRANK |
| • | EMIS DEV |
| • | OXY SNSR |
| • | ECM/PCM |
| • | ABS |
| • | ABS MTR |
| • | A/C CLUTCH |
| • | TRANS/IGN 1 |
One or more of the following DTC may be stored.
P0103 | Mass Air Flow (MAF) Sensor Circuit High Frequency |
P0106 | Manifold Absolute Pressure (MAP) Sensor Performance |
P0107 | Manifold Absolute Pressure (MAP) Sensor Circuit Low Voltage |
P0108 | Manifold Absolute Pressure (MAP) Sensor Circuit High Voltage |
P0116 | Engine Coolant Temperature (ECT) Sensor Performance. |
P0117 | Engine Coolant Temperature (ECT) Sensor Circuit Low Voltage |
P0335 | Crankshaft Position (CKP) Sensor A Circuit |
P0340 | Camshaft Position (CMP) Sensor Circuit |
P0341 | Camshaft Position (CMP) Sensor Performance |
P0350 | Ignition Coil Control Circuit |
P0443 | Evaporative Emission (EVAP) Purge Solenoid Control Circuit |
P0615 | Starter Relay Control Circuit |
P0641 | 5-Volt Reference 1 Circuit |
P0645 | Air Conditioning (A/C) Clutch Relay Control Circuit |
P0973 | 1-2 Shift Solenoid (SS) Control Circuit Low Voltage |
P0976 | 2-3 Shift Solenoid (SS) Control Circuit Low Voltage |
P1111 | Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage |
P1112 | Intake Air Temperature (IAT) Sensor Circuit Intermittent High Voltage |
P1125 | Accelerator Pedal Position (APP) System |
P1574 | Stop Lamp Switch Circuit |
P2107 | Throttle Actuator Control (TAC) Module Internal Circuit |
P2108 | Throttle Actuator Control (TAC) Module Performance |
P2119 | Throttle Closed Position Performance |
P2122 | Accelerator Pedal Position (APP) Sensor 1 Circuit Low Voltage |
P2123 | Accelerator Pedal Position (APP) Sensor 1 Circuit High Voltage |
P2127 | Accelerator Pedal Position (APP) Sensor 2 Circuit Low Voltage |
P2128 | Accelerator Pedal Position (APP) Sensor 2 Circuit High Voltage |
P2138 | Accelerator Pedal Position (APP) Sensor 1-2 Correlatio |
P2162 | Vehicle Speed Sensor (VSS) Circuit 1-2 Correlation |
P2764 | Torque Converter Clutch (TCC) Pressure Control (PC) Solenoid Control Circuit Low Voltage |
U0121 | Lost Communication With Electronic Brake Control Module (EBCM) |
U1814 | Powertrain High Speed Communication Enable Circuit |
The cause may be the engine wire harness chafing on the throttle body (1) when the intake manifold cover is installed.
Recommendation/Instructions:
Inspect the engine wire harness on top of the throttle body. Roll the harness over and check for gaps in the harness tape/ protection that can allow ckt 447 Starter Relay Coil Control to chafe. Repair the wiring as needed using procedures found in Diagnostic Information and Procedures- Wiring Repairs.
Please follow this diagnostic or repair process thoroughly and complete each step. If the condition exhibited is resolved without completing every step, the remaining steps do not need to be performed.
