P1623 Code - Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
Quick Answer
With the cold engine startup completed, engine running, the Powertrain Control Module (PCM) detects a fault in the PCM pull-up resistor used to revise Engine Coolant Temperature (ECT) resolution throughout the complete engine operating range. Common causes include Faulty Transmission Fluid Temperature (TFT), Transmission Fluid Temperature (TFT) harness is open or shorted, Transmission Fluid Temperature (TFT) circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
- What it means
- P1623 indicates Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions.
- Common causes
- Common causes include Faulty Transmission Fluid Temperature (TFT), Transmission Fluid Temperature (TFT) harness is open or shorted, Transmission Fluid Temperature (TFT) circuit poor electrical connection.
- Severity
- High - diagnose this code as soon as possible.
- Can I drive?
- Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
Code P1623 Description
What are the Possible Causes of the DTC P1623?
- Faulty Transmission Fluid Temperature (TFT)
- Transmission Fluid Temperature (TFT) harness is open or shorted
- Transmission Fluid Temperature (TFT) circuit poor electrical connection
How to Fix the DTC P1623?
Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.
What is the Cost to Diagnose the Code?
Labor: 1.0
To diagnose the P1623 code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.
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Need Help with the Code?
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Information for Specific Makes
- P1623 Audi — CAN Data Bus No Signal
- P1623 Buick — Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
- P1623 Cadillac — Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
- P1623 Chevrolet — Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
- P1623 GMC — Transmission Fluid Temperature Sensor Pullup Resistor Circuit Conditions
- P1623 Hyundai — Radiator Cooling Fan Malfunction
- P1623 KIA — Malfunction Indicator Lamp Open /Short
- P1623 Mazda — Engine Control Module Immobilizer Read / Write Error EEPROM Damaged
- P1623 Nissan — Injector Adjustment Value
- P1623 Saab — CAN Data Bus Transmission Control Module
- P1623 Volkswagen — CAN Data Bus No Signal
Frequently Asked Questions about P1623 Code
No Frequently Asked Questions about P1623 Code found.
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