Lincoln Aviator: Maintenance

Changing a Fuse

Fuses WARNING: Always replace a fuse with one that has the specified amperage rating. Using a fuse with a higher amperage rating can cause severe wire damage and could start a fire...

General Information

Have your vehicle serviced regularly to help maintain its roadworthiness and resale value. There is a large network of authorized dealers that are there to help you with their professional servicing expertise...

Other information:

Lincoln Aviator 2020-2025 Service Manual: Removal and Installation - Vehicle Dynamics Control Module (VDM)

Special Tool(s) / General Equipment Interior Trim Remover Removal NOTICE: Electronic modules are sensitive to static electrical charges. If exposed to these charges, damage may result. NOTE: Removal steps in this procedure may contain installation details...

Lincoln Aviator 2020-2025 Service Manual: Diagnosis and Testing - Climate Control System

Diagnostic Trouble Code (DTC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices. REFER to: Diagnostic Methods (100-00 General Information, Description and Operation).   Diagnostic Trouble Code Chart Module   DTC Description Action   ACCM B11EE:19 A/C Compressor: Circuit Current Above Threshold   GO to Pinpoint Test AJ   ACCM B11EE:41 A/C Compressor: General Checksum Failure   GO to Pinpoint Test AS   ACCM B11EE:4B A/C Compressor: Over Temperature   GO to Pinpoint Test AJ   ACCM B11EE:92 A/C Compressor: Performance or Incorrect Operation   GO to Pinpoint Test AJ   ACCM P0562:00 System Voltage Low: No Sub Type Information   GO to Pinpoint Test AJ   ACCM P0563:00 System Voltage High: No Sub Type Information   GO to Pinpoint Test AJ   ACCM P0AFA:16 Hybrid/EV Battery System Voltage Low: Circuit Voltage Below Threshold   GO to Pinpoint Test AJ   ACCM P0AFB:17 Hybrid/EV Battery System Voltage High: Circuit Voltage Above Threshold   GO to Pinpoint Test AJ   ACCM P0AFB:1C Hybrid/EV Battery System Voltage High: Circuit Voltage Out of Range   GO to Pinpoint Test AJ   ACCM U0001:88 High Speed CAN Communication Bus: Bus Off   GO to Pinpoint Test AP   ACCM U0100:00 Lost Communication with ECM/PCM "A": No Sub Type Information   GO to Pinpoint Test AL   ACCM U0111:00 Lost Communication With Battery Energy Control Module "A": No Sub Type Information   GO to Pinpoint Test AM   ACCM U0140:00 Lost Communication With Body Control Module: No Sub Type Information   GO to Pinpoint Test P   ACCM U3000:04 Control Module: System Internal Failure   GO to Pinpoint Test AS   ACCM U3000:42 Control Module: General Memory Failure   GO to Pinpoint Test AS   ACCM U3000:49 Control Module: Internal Electronic Failure   GO to Pinpoint Test AS   BCMC B3A01:00 A/C Refrigerant Distribution Valve Actuator "C" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AV   BCMC B3A02:00 A/C Refrigerant Distribution Valve Actuator "C" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AV   BCMC B3A03:00 A/C Refrigerant Distribution Valve Actuator "C" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AV   BCMC P2611:00 A/C Refrigerant Distribution Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AT   BCMC P2612:00 A/C Refrigerant Distribution Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AT   BCMC P2613:00 A/C Refrigerant Distribution Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AT   BCMC P2CFC:00 A/C Clutch Control Circuit: No Sub Type Information   GO to Pinpoint Test B   BCMC P2CFD:00 A/C Clutch Control Circuit Low: No Sub Type Information   GO to Pinpoint Test B   BCMC P2CFE:00 A/C Clutch Control Circuit: No Sub Type Information   GO to Pinpoint Test B   BCMC P2E62:00 Engine Coolant Bypass Valve "E" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AU   BCMC P2E63:00 Engine Coolant Bypass Valve "E" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AU   BCMC P2E64:00 Engine Coolant Bypass Valve "E" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AU   HVAC B102E:11 Air Quality Sensor: Circuit Short To Ground   GO to Pinpoint Test Y   HVAC B102E:15 Air Quality Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test Y   HVAC B102E:92 Air Quality Sensor: Performance or Incorrect Operation   GO to Pinpoint Test Y   HVAC B1081:07 Left Temperature Damper Motor: Mechanical Failure   GO to Pinpoint Test G   HVAC B1081:11 Left Temperature Damper Motor: Circuit Short To Ground   GO to Pinpoint Test G   HVAC B1081:12 Left Temperature Damper Motor: Circuit Short To Battery   GO to Pinpoint Test G   HVAC B1081:13 Left Temperature Damper Motor: Circuit Open   GO to Pinpoint Test G   HVAC B1082:07 Right Temperature Damper Motor: Mechanical Failure   GO to Pinpoint Test H   HVAC B1082:11 Right Temperature Damper Motor: Circuit Short To Ground   GO to Pinpoint Test H   HVAC B1082:12 Right Temperature Damper Motor: Circuit Short To Battery   GO to Pinpoint Test H   HVAC B1082:13 Right Temperature Damper Motor: Circuit Open   GO to Pinpoint Test H   HVAC B1083:07 Recirculation Damper Motor: Mechanical Failure   GO to Pinpoint Test I   HVAC B1083:11 Recirculation Damper Motor: Circuit Short To Ground   GO to Pinpoint Test I   HVAC B1083:12 Recirculation Damper Motor: Circuit Short To Battery   GO to Pinpoint Test I   HVAC B1083:13 Recirculation Damper Motor: Circuit Open   GO to Pinpoint Test I   HVAC B1086:07 Air Distribution Damper Motor: Mechanical Failure   GO to Pinpoint Test J   HVAC B1086:11 Air Distribution Damper Motor: Circuit Short To Ground   GO to Pinpoint Test J   HVAC B1086:12 Air Distribution Damper Motor: Circuit Short To Battery   GO to Pinpoint Test J   HVAC B1086:13 Air Distribution Damper Motor: Circuit Open   GO to Pinpoint Test J   HVAC B10AF:11 Blower Fan Relay: Circuit Short To Ground   GO to Pinpoint Test N   HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open   GO to Pinpoint Test N   HVAC B10AF:15 Blower Fan Relay: Circuit Short To Battery or Open   GO to Pinpoint Test O   HVAC B10B3:11 Right Panel Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test AA   HVAC B10B3:15 Right Panel Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test AA   HVAC B10B4:11 Right Floor Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test AA   HVAC B10B4:15 Right Floor Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test AA   HVAC B10B5:11 Left Panel Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test AA   HVAC B10B5:15 Left Panel Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test AA   HVAC B10B6:11 Left Floor Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test AA   HVAC B10B6:15 Left Floor Air Discharge Temperature: Circuit Short To Battery or Open   GO to Pinpoint Test AA   HVAC B10B7:11 Rear Air Discharge Temperature: Circuit Short To Ground   GO to Pinpoint Test AG   HVAC B10B7:15 Rear Air Discharge Temperature: Circuit Short To Battery Or Open   GO to Pinpoint Test AG   HVAC B10B9:12 Blower Control: Circuit Short To Battery   GO to Pinpoint Test N   HVAC B10B9:14 Blower Control: Circuit Short To Ground or Open   GO to Pinpoint Test N   HVAC B10BA:12 Rear Blower Control: Circuit Short To Battery   GO to Pinpoint Test AX   HVAC B10BA:14 Rear Blower Control: Circuit Short To Ground or Open   GO to Pinpoint Test AX   HVAC B11E3:07 Rear HVAC Damper Motor: Mechanical Failure   GO to Pinpoint Test AG   HVAC B11E3:11 Rear HVAC Damper Motor: Circuit Short To Ground   GO to Pinpoint Test AG   HVAC B11E3:12 Rear HVAC Damper Motor: Circuit Short To Battery   GO to Pinpoint Test AG   HVAC B11E3:13 Rear HVAC Damper Motor: Circuit Open   GO to Pinpoint Test AG   HVAC B11E4:07 Rear Air Distribution Damper Motor: Mechanical Failure   GO to Pinpoint Test AF   HVAC B11E4:11 Rear Air Distribution Damper Motor: Circuit Short to Ground   GO to Pinpoint Test AF   HVAC B11E4:12 Rear Air Distribution Damper Motor: Circuit Short To Battery   GO to Pinpoint Test AF   HVAC B11E4:13 Rear Air Distribution Damper Motor: Circuit Open   GO to Pinpoint Test AF   HVAC B11E5:11 Left HVAC Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test G   HVAC B11E5:15 Left HVAC Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test G   HVAC B11E6:11 Right HVAC Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test H   HVAC B11E6:15 Right HVAC Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test H   HVAC B11E7:11 Air Distribution Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test J   HVAC B11E7:15 Air Distribution Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test J   HVAC B11EC:12 Rear HVAC Blower Control Input: Circuit Short To Battery   GO to Pinpoint Test AD   HVAC B11EC:14 Rear HVAC Blower Control Input: Circuit Short To Ground or Open   GO to Pinpoint Test AD   HVAC B11F0:11 Air Intake Damper Position Sensor: Circuit Short To Ground   GO to Pinpoint Test I   HVAC B11F0:15 Air Intake Damper Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test I   HVAC B1364:07 Left Rear Temperature Damper Motor: Mechanical Failure   GO to Pinpoint Test AH   HVAC B1364:11 Left Rear Temperature Damper Motor: Circuit Short To Ground   GO to Pinpoint Test AH   HVAC B1364:12 Left Rear Temperature Damper Motor: Circuit Short To Battery   GO to Pinpoint Test AH   HVAC B1364:13 Left Rear Temperature Damper Motor: Circuit Open   GO to Pinpoint Test AH   HVAC B1379:11 Rear Cabin Temperature Sensor: Circuit Short To Ground   GO to Pinpoint Test BB   HVAC B1379:15 Rear Cabin Temperature Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test BB   HVAC B14D3:11 Left Rear Panel Discharge Sensor: Circuit Short To Ground   GO to Pinpoint Test BA   HVAC B14D3:15 Left Rear Panel Discharge Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test BA   HVAC B14D4:11 Left Rear Floor Discharge Sensor: Circuit Short To Ground   GO to Pinpoint Test BA   HVAC B14D4:15 Left Rear Floor Discharge Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test BA   HVAC B1580:11 Console Airflow Shut Off Door Position Sensor: Circuit Short To Ground   GO to Pinpoint Test AZ   HVAC B1580:15 Console Airflow Shut Off Door Position Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test AZ   HVAC B1581:07 Console Airflow Shut Off Door Damper Motor: Mechanical Failure   GO to Pinpoint Test AZ   HVAC B1581:11 Console Airflow Shut Off Door Damper Motor: Circuit Short To Ground   GO to Pinpoint Test AZ   HVAC B1581:12 Console Airflow Shut Off Door Damper Motor: Circuit Short To Battery   GO to Pinpoint Test AZ   HVAC B1581:13 Console Airflow Shut Off Door Damper Motor: Circuit Open   GO to Pinpoint Test AZ   HVAC B1582:11 Left Panel Discharge Sensor #3: Circuit Short To Ground   GO to Pinpoint Test BA   HVAC B1582:15 Left Panel Discharge Sensor #3: Circuit Short To Battery or Open   GO to Pinpoint Test BA   HVAC B158C:11 Air Distribution Damper Position Sensor #3: Circuit Short To Ground   GO to Pinpoint Test AF   HVAC B158C:15 Air Distribution Damper Position Sensor #3: Circuit Short To Battery or Open   GO to Pinpoint Test AF   HVAC B158F:11 Left HVAC Damper Position Sensor #3: Circuit Short To Ground   GO to Pinpoint Test AH   HVAC B158F:15 Left HVAC Damper Position Sensor #3: Circuit Short To Battery or Open   GO to Pinpoint Test AH   HVAC B159B:11 Cabin Temperature Sensor #3: Circuit Short To Ground   GO to Pinpoint Test BB   HVAC B159B:15 Cabin Temperature Sensor #3: Circuit Short To Battery or Open   GO to Pinpoint Test BB   HVAC B159E:07 Air Distribution Damper Motor #3: Mechanical Failure   GO to Pinpoint Test AF   HVAC B159E:11 Air Distribution Damper Motor #3: Circuit Short To Ground   GO to Pinpoint Test AF   HVAC B159E:12 Air Distribution Damper Motor #3: Circuit Short To Battery   GO to Pinpoint Test AF   HVAC B159E:13 Air Distribution Damper Motor #3: Circuit Open   GO to Pinpoint Test AF   HVAC B1A61:11 Cabin Temperature Sensor: Circuit Short To Ground   GO to Pinpoint Test E   HVAC B1A61:15 Cabin Temperature Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test E   HVAC B1A63:11 Right Solar Sensor: No Sub Type Information   GO to Pinpoint Test Z   HVAC B1A63:15 Right Solar Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test Z   HVAC B1A64:11 Left Solar Sensor: No Sub Type Information   GO to Pinpoint Test Z   HVAC B1A64:15 Left Solar Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test Z   HVAC B1A69:11 Humidity Sensor: Circuit Short To Ground   GO to Pinpoint Test E   HVAC B1A69:15 Humidity Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test E   HVAC B1B71:11 Evaporator Temperature Sensor: Circuit Short To Ground   GO to Pinpoint Test F   HVAC B1B71:15 Evaporator Temperature Sensor: Circuit Short To Battery or Open   GO to Pinpoint Test F   HVAC B1B7D:11 Rear Air Distribution Actuator: Circuit Short to Ground   GO to Pinpoint Test AF   HVAC B1B7D:15 Rear Air Distribution Actuator: Circuit Short To Battery or Open   GO to Pinpoint Test AF   HVAC C1B14:11 Sensor Supply Voltage A: Circuit Short to Ground   GO to Pinpoint Test AC   HVAC C1B14:12 Sensor Supply Voltage A: Circuit Short to Battery   GO to Pinpoint Test AC   HVAC P24AE:09 Particulate Matter Sensor Circuit: Component Failure   GO to Pinpoint Test AW   HVAC P24AE:8F Particulate Matter Sensor Circuit: Erratic   GO to Pinpoint Test AW   HVAC P24AE:92 Particulate Matter Sensor Circuit: Performance or Incorrect Operation   GO to Pinpoint Test AW   HVAC U0140:00 Lost Communication With Body Control Module: No Sub Type Information   GO to Pinpoint Test P   HVAC U0155:00 Lost Communication With Instrument Panel Cluster (IPC) Control Module: No Sub-Type Information   GO to Pinpoint Test Q   HVAC U0165:00 Lost Communication With HVAC Control Module - Rear: No Sub Type Information   GO to Pinpoint Test S   HVAC U0249:00 Lost Communication With Entertainment Control Module -Rear "B": No Sub Type Information   GO to Pinpoint Test T   HVAC U0253:00 Lost Communication With Accessory Protocol Interface Module: No Sub Type Information   GO to Pinpoint Test V   HVAC U025D:00 Lost Communication With Front Controls Interface Module "B": No Sub Type Information   GO to Pinpoint Test W   HVAC U0401:00 Invalid Data Received from ECM/PCM A: No Sub-Type Information   GO to Pinpoint Test AQ   HVAC U0401:82 Invalid Data Received from ECM/PCM A: Alive / Sequence Counter Incorrect / Not Updated   GO to Pinpoint Test AQ   HVAC U0422:68 Invalid Data Received from Body Control Module: Event Information   GO to Pinpoint Test AQ   HVAC U0422:81 Invalid Data Received from Body Control Module: Invalid Serial Data Received   GO to Pinpoint Test AQ   HVAC U0452:00 Invalid Data Received From Restraints Control Module: No Sub Type Information   GO to Pinpoint Test AQ   HVAC U054A:68 Invalid Data Received From Entertainment Control Module-Rear "B": Event Information   GO to Pinpoint Test AQ   HVAC U055E:68 Invalid Data Received From Front Controls Interface Module "B": Event Information   GO to Pinpoint Test AQ   HVAC U1000:00 Solid State Driver Protection Active -Driver Disabled: No Sub Type Information   GO to Pinpoint Test X   HVAC U2024:51 Control Module Cal-Config Data: Not Programmed   GO to Pinpoint Test AR   HVAC U2100:00 Initial Configuration Not Complete: No Sub Type Information   GO to Pinpoint Test AR   HVAC U3000:49 Control Module: Internal Electronic Failure   GO to Pinpoint Test AS   HVAC U3003:16 Battery Voltage: Circuit Voltage Below Threshold   GO to Pinpoint Test AN   HVAC U3003:17 Battery Voltage: Circuit Voltage Above Threshold   GO to Pinpoint Test AO   PCM P0532:00 A/C Refrigerant Pressure Sensor A Circuit Low: No Sub Type Information   GO to Pinpoint Test A   PCM P0533:00 A/C Refrigerant Pressure Sensor A Circuit High: No Sub Type Information   GO to Pinpoint Test A   PCM P0645:00 A/C Clutch Relay Control Circuit: No Sub Type Information   GO to Pinpoint Test B   PCM P06A0:00 Variable Compressor Control Circuit: No Sub Type Information   GO to Pinpoint Test C   PCM P1464:00 A/C Demand Out Of Self Test Range: No Sub Type Information   GO to Pinpoint Test M   PCM P193E:00 A/C Clutch Request Signal: No Sub Type Information   GO to Pinpoint Test AB   PCM P2183:00 Engine Coolant Temperature Sensor 2: Circuit Range/Performance   GO to Pinpoint Test BC   PCM P2184:00 Engine Coolant Temperature Sensor 2: Circuit Low   GO to Pinpoint Test BC   PCM P2185:00 Engine Coolant Temperature Sensor 2: Circuit High   GO to Pinpoint Test BC   PCM P2186:00 Engine Coolant Temperature Sensor 2: Circuit Intermittent/Erratic   GO to Pinpoint Test BC   PCM P2600:00 Coolant Pump "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test D   PCM P2601:00 Coolant Pump "A" Control Circuit Performance/Stuck Off: No Sub Type Information   GO to Pinpoint Test D   PCM P2602:00 Coolant Pump "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test D   PCM P2603:00 Coolant Pump "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test D   PCM P26BE:00 Engine Coolant Bypass Valve "D" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test BH   PCM P26BF:00 Engine Coolant Bypass Valve "D" Control Circuit High: No Sub Type Information   GO to Pinpoint Test BH   RHVAC B10B8:63 Push Buttons: Circuit / Component Protection Time-Out   GO to Pinpoint Test AI   RHVAC U0140:00 Lost Communication With Body Control Module: No Sub Type Information   GO to Pinpoint Test P   RHVAC U0164:00 Lost Communication With HVAC Control Module: No Sub Type Information   GO to Pinpoint Test R   RHVAC U0247:00 Lost Communication With Seat Control Module "F": No Sub Type Information   GO to Pinpoint Test U   RHVAC U0422:68 Invalid Data Received From Body Control Module: Event Information   GO to Pinpoint Test AQ   RHVAC U3000:41 Control Module: General Checksum Failure   GO to Pinpoint Test AS   RHVAC U3000:42 Control Module: General Memory Failure   GO to Pinpoint Test AS   RHVAC U3003:16 Battery Voltage: Circuit Voltage Below Threshold   GO to Pinpoint Test AN   RHVAC U3003:17 Battery Voltage: Circuit Voltage Above Threshold   GO to Pinpoint Test AO   SOBDMC P01EB:96 Engine Coolant Heater "A" Control Circuit Performance: Component Internal Failure   GO to Pinpoint Test AK   SOBDMC P0531:00 A/C Refrigerant Pressure Sensor "A" Circuit Range/Performance: No Sub Type Information   GO to Pinpoint Test A   SOBDMC P0534:00 A/C Refrigerant Charge Loss: No Sub Type Information   GO to Pinpoint Test A   SOBDMC P0D6D:00 A/C Compressor Motor Voltage "A" Low: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P0D6F:00 A/C Compressor Motor Current High: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P0D71:00 A/C Compressor Control Module Internal Temperature Sensor Performance: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P2611:00 A/C Refrigerant Distribution Valve "A" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AT   SOBDMC P2612:00 A/C Refrigerant Distribution Valve "A" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AT   SOBDMC P2613:00 A/C Refrigerant Distribution Valve "A" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AT   SOBDMC P26FD:00 A/C Compressor Internal Control Module Performance: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P2D41:00 A/C Compressor Motor Voltage "B" Performance: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P2D42:00 A/C Compressor Motor Voltage "B" Low: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P2D44:00 A/C Compressor Motor Performance: No Sub Type Information   GO to Pinpoint Test AJ   SOBDMC P2DA4:00 Coolant Heater "A" Internal Control Module Performance: No Sub Type Information   GO to Pinpoint Test AK   SOBDMC P2DA5:00 Coolant Heater "A" Supply Voltage Circuit: No Sub Type Information   GO to Pinpoint Test AK   SOBDMC P2DA6:00 Coolant Heater "A" Over Temperature: No Sub Type Information   GO to Pinpoint Test AK   SOBDMC P2DA7:00 Coolant Heater "A" Internal Control Module Control Module System Voltage: No Sub Type Information   GO to Pinpoint Test AK   SOBDMC P2E62:00 Engine Coolant Bypass Valve "E" Control Circuit/Open: No Sub Type Information   GO to Pinpoint Test AU   SOBDMC P2E63:00 Engine Coolant Bypass Valve "E" Control Circuit Low: No Sub Type Information   GO to Pinpoint Test AU   SOBDMC P2E64:00 Engine Coolant Bypass Valve "E" Control Circuit High: No Sub Type Information   GO to Pinpoint Test AU   SOBDMC U069E:81 Lost Communication With Coolant Heater "A": Invalid Serial Data Received   GO to Pinpoint Test AK   SOBDMC U069E:87 Lost Communication With Coolant Heater "A": Missing Messages   GO to Pinpoint Test AK Global Customer Symptom Code (GCSC) Chart Diagnostics in this manual assume a certain skill level and knowledge of Ford-specific diagnostic practices...