Vehicle: 2017 Lincoln MKC, AWD, L4-2.0L Turbo, Automatic Transmission/Transaxle

Mileage: 45,659

Problem: This MKC was towed in with a cranks/does not start concern, and the malfunction indicator light (MIL) was on.

Case Details: The first order of business was to scan for diagnostic trouble codes (DTCs). The technician found the following 17 DTCs:

• P2138 - Throttle / Pedal Position Sensor / Switch D / E Voltage Correlation
• P2127 - Throttle / Pedal Position Sensor / Switch E Circuit Low
• P1012 - Wastegate Control Pressure Sensor Circuit Low
• P0A5B - Generator Current Sensor Circuit Low
• P0532 - A/C Refrigerant Pressure Sensor “A” Circuit Low
• P0523 - Engine Oil Pressure Sensor/Switch "A" Circuit High
• P0522 - Engine Oil Pressure Sensor/Switch "A" Circuit Low
• P051C - Crankcase Pressure Sensor Circuit Low
• P0369 - Camshaft Position Sensor B Circuit Intermittent (Bank 1)
• P0365 - Camshaft Position Sensor B Circuit (Bank 1)
• P0344 - Camshaft Position Sensor A Circuit Intermittent (Bank 1)
• P0340 - Camshaft Position Sensor A Circuit (Bank 1)
• P0237 - Turbocharger Boost Sensor A Circuit Low
• P0236 - Turbocharger Boost Sensor A Circuit Range/Performance
• P0107 - Manifold Absolute Pressure/Barometric Pressure Circuit Low Input
• P0106 - Manifold Absolute Pressure/Barometric Pressure Circuit Range/Performance Problem
• P00C6 - Fuel Rail Pressure Too Low - Engine Cranking (Bank 1)

The technician called ALLDATA Tech-Assist for advice on where to start. The consultant suggested reviewing the wiring diagrams together. They found that all the affected sensors on the list shared the same 5-volt reference from the powertrain control module (PCM).

The technician checked one of the sensors to find the 5-volt reference signal was low. He started unplugging the other sensors on the list one at a time. When he unplugged the intake camshaft position (CMP) sensor, the full 5-volts returned to all the other sensors.

Confirmed Repair: The technician replaced the CMP sensor and cleared the DTCs. The MKC cranked, started and ran perfectly. After the test drive, no DTCs returned. Fixed!