Pinpoint Test A: P0218, P1783
WARNING: This page is about a different car, the 2021 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- Normal Operation and Fault Conditions
The TFT sensor is a temperature dependent resistor that is in contact with transmission fluid in the transmission sump area. The PCM monitors the voltage drop across the TFT sensor, which changes as transmission fluid temperature varies. If the PCM detects an over temperature condition, it will set a DTC, and may limit engine torque to prevent further overheating.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition PCM P0218:00 Transmission Fluid Temperature Sensor "A" Over Temperature Condition: No Sub Type Information This DTC indicates the PCM detected a transmission fluid over temperature condition. This DTC will limit powertrain torque to prevent further overheating. PCM P1783:00 Transmission Overtemperature Condition: No Sub Type Information This DTC indicates the transmission fluid temperature was greater than 275°F (135°C) for more than 5 seconds. Possible Sources
- TFT sensor circuit fault
- Transmission fluid heater coolant control valve
- Transmission overheating condition
- A1 CHECK FOR TFT (TRANSMISSION FLUID TEMPERATURE) SENSOR CIRCUIT DIAGNOSTIC TROUBLE CODES (DTCS)
- Carry out the KOEO and KOERPCM self-tests.
Are any TFT sensor circuit diagnostic trouble codes (DTCs) present?
Yes RESOLVE all TFT sensor circuit diagnostic trouble codes (DTCs) first. REFER to: DTC Chart and Pinpoint Tests - 3.5L V6 PowerBoost (CN) . No GO to A2 - A2 CHECK FOR TRANSMISSION FLUID HEATER COOLANT CONTROL VALVE DIAGNOSTIC TROUBLE CODES (DTCS)
- Retrieve all diagnostic trouble codes (DTCs) from the PCM self-tests.
Are diagnostic trouble codes (DTCs) P2681, P2682, and/or P2683 present?
Yes RESOLVE those diagnostic trouble codes (DTCs) first. GO to Pinpoint Test B No To diagnose an overheating concern, GO to Pinpoint Test C