2003 Lincoln Town Car BaseFACTORY OEM SERVICE PROCEDURE

Cruise Control System DTCS

SPEED CONTROL ACTUATOR DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC Description Cause Action
B1318 Battery Voltage Low Speed Control Actuator Go to PINPOINT TEST C .
B1342 ECU is Defective Speed Control Actuator INSTALL a new speed control actuator. REFER to SPEED CONTROL SERVO . REPEAT the self-test.
C1109 Throttle Position Did Not Return to Idle After Self-Test Speed Control Actuator Go to PINPOINT TEST D .
C1126 Speed Control Actuator Switch Stuck for Two Minutes or Longer Speed Control Actuator Go to PINPOINT TEST E .
C1127 Deactivator Switch Circuit Failure Speed Control Actuator Go to PINPOINT TEST F .
C1179 Speed Control Cable Slack Failure Speed Control Actuator Go to PINPOINT TEST G .
U1027 SCP Invalid or Missing Data for Engine RPM PCM CARRY OUT the PCM Self-Test.
U1041 SCP Invalid or Missing Data for Vehicle Speed ABS CARRY OUT the ABS Self-Test.
U1051 SCP Invalid or Missing Data for Brakes LCM CARRY OUT the LCM Self-Test.
U1059 SCP Invalid or Missing Data for Transmission/Transaxle/PRNDL PCM CARRY OUT the PCM Self-Test.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.